# Electrolyser 4.0 (EL 4.0)

Our plug & play AEM electrolysers turn renewable electricity and water into low-cost green hydrogen. At any scale, for any application.

EL40 Image

# 📖 Downloads

This document lists the differences between Enapter’s air cooled vs. the liquid cooled electrolysers as well as the differences between the AC powered and the DC powered version.

Datasheet Owner’s Manual Quick Start Guides Comparison with EL 2.1 Cooling Power Supply
EL 4.0 EN EN EN PDF Air cooled AC
EL 4.0 DC EN DC
EL 4.0 LC EN Liquid cooled AC
EL 4.0 DC LC EN DC

Simplified P&ID CAD Drawings Front Isometric Side Perspective
EL 4.0 PNG 3D STP
3D IGS
Download Download Download Download
EL 4.0 DC 3D STP
3D IGS
Download Download Download Download
EL 4.0 LC 3D STP
3D IGS
Download Download Download
EL 4.0 DC LC 3D STP
3D IGS
Download Download Download

# 🚀 Getting Started

Installing electrolyser for the first time? Download Quick Start Guide and follow instructions.

EL40 QSG Image

Note

Electrolyser EL 4.0 installation process requires Enapter Mobile App (opens new window) or Web GUI (opens new window).

# 🖥️ Web GUI

Enapter Electrolyser Web GUI (Graphical User Interface) made for local control and monitoring using a web browser. For more information please check Web GUI Documentation (opens new window).

EL40 Web GUI Image

# 🚦 Status Indications

# LEDs Indications

Action Description LED
Power on Power on The device will turn on as soon as the required input voltage is supplied to the EL 4.0 and perform a startup self-check. Red, yellow & green blink thrice
Stand-by IDLE Stand-by (Idle state) The device is idle, waiting for the start of production. Red, yellow & green are off
Stand-by Max Pressure Stand-by (Max pressure state) The device reached maximum pressure (normally 35 bar) and will resume hydrogen production automatically when the restart output pressure setpoint is reached. Green blinking
Steady Steady The device in steady state. Green steady
Button press Button press When the start-stop button is pressed. Red, yellow & green blink once
Factory reset Factory Settings Reset Simultaneously pressing the start-stop button and powering up the device will activate Factory Settings Reset. Running fire (each LED blinks after another)
Maintenance Maintenance mode The device is in maintenance mode. Yellow steady
Locate Locate device When locate device is enabled via remote control. Red, yellow & green blinking
Warning Warning Heads-up event which should be taken into account to avoid Error or Fatal Error. Yellow Blinks
Error Error System Stopped. Recoverable error. Red Blinks
Fatal Error Fatal Error System stopped. Unrecoverable error. Hardware repair required. Please contact Enapter support. Red and Yellow Blinks
Panic Hardware
Panic Software
Panic System stopped. Unrecoverable error. Please contact Enapter support. Red steady with green steady (hardware problem) or yellow steady (software problem)

# Sound Indications

Safety Board has built in buzzer which helps to provide additional level of information for user.

Action Description Sound
Buzzer is broken or board is not operational. Silence on start
Successful Safety Board Start. Buzzer is functional. Short Beep
Successful Factory Settings Reset. Three Short Beeps
Safety Fatal Error FY_51 SIF1: Hydrogen stack overpressure Long Beep - Pause - Short Beep
Safety Fatal Error FY_52 SIF2: Recombiner chamber overtemperature Long Beep - Pause - Two Short Beeps
Safety Fatal Error FY_53 SIF3: Water leakage detection Long Beep - Pause - Three Short Beeps
Safety Fatal Error FY_54 SIF4: Tank overpressure Long Beep - Pause - Four Short Beeps
Safety Fatal Error FY_55 SIF5: Dilution fan for hydrogen concentration Long Beep - Pause - Five Short Beeps
Safety Fatal Error FY_56 SIF6: Safety Electronic Board temperature Long Beep - Pause - Six Short Beeps
Safety Fatal Error FY_20 Dry contact Long Beep - Pause - Seven Short Beeps
Safety Fatal Error FY_21 Communication fail Long Beep - Pause - Eight Short Beeps
Safety Fatal Error FY_22 Safe State requested by Control Board Long Beep - Pause - Nine Short Beeps
Safety Fatal Error FY_23 Incompatible Control Board version Long Beep - Pause - Ten Short Beeps
Safety Fatal Error FY_24 Relay broken Long Beep - Pause - 11 Short Beeps
Safety Fatal Error FY_25 Proof-test can not be started Long Beep - Pause - 12 Short Beeps
Safety Fatal Error FY_26 Proof-test failed Long Beep - Pause - 13 Short Beeps
Safety Fatal Error FY_27 Inner pressure transmitter broken Long Beep - Pause - 14 Short Beeps
Safety Fatal Error FY_28 Wrong Control Board Long Beep - Pause - 16 Short Beeps
Safety Fatal Error FY_29 Recombiner Chamber Temperature Sensor broken Long Beep - Pause - 17 Short Beeps
Safety Fatal Error FY_30 Tachometer or Fan broken Long Beep - Pause - 18 Short Beeps
Safety Fatal Error FY_31 Safety Board Temperature Sensor broken Long Beep - Pause - 19 Short Beeps
Safety Fatal Error FY_33 Brownout Long Beep - Pause - 20 Short Beeps
Dry Contact restored Normal operation restored Long Beep
Unexpected Error Used in cases when it is not possible to understand the root cause and ensure delivery of error code in communication packet. SOS: 3 Short Beeps - 3 Long Beeps - 3 Short Beeps
Safety Fatal Error FY_21 Indicates communication lost with Control Board.
NOTE: COMMUNICATION FAIL is normal when Control Board firmware updated. It loses communication and identifies the update process when you are not allowed to turn off the power.
Consecutive Beeps

# ⚠️ Events & Troubleshooting

Note

In case your Electrolyser trigger any kind of event you can try to troubleshoot them using our Self Service Troubleshooting flowcharts.

# Severity Levels

Code Severity Level LED Indication Description Comment
F Fatal Error Red and Yellow Blinks System stopped. Unrecoverable error. Hardware repair required. e.g. Pressure sensor is not connected or broken.
E Error Red Blinks System Stopped. Recoverable error. e.g. No input water pressure and internal water tank is empty.
W Warning Yellow Blinks Heads-up event which should be taken into account to avoid Error or Fatal Error. e.g. No input water pressure and internal water tank is full.

# Routines

Code Routine Comment
P Platform
C Electrolyte Pump
D Stack Ramp Down
R Water Refilling
S Steady Hydrogen Production
T Electrolyte Heater
U Stack Ramp Up
X Safety Check
F Anti-freezing
L Leakage Test
O Blowdown
H Heartbeat
Z Polarization Curve
Y Safety Board

# Warning, Error and Fatal Error Codes

Note

The Code and Name marked in bold are introduced in the current release of firmware.

Code Name Severity Code Routine Code Component Condition Description Troubleshooting
0x0000 none -- -- -- No error
0x0FFF int -- -- -- Hardware failure Unexpected error Please contact Enapter Customer Support. Unexpected error, not further specified. Please read the logs for details.
0x1F81 FP_01 F P -- Voltage < 2.9V Brownout detected Brownout detected. Please restore power and reset the system.
0x1F82 FP_02 F P -- Updated firmware has new mandatory settings New parameters have been added to the configuration Please contact Enapter Customer Support. Enapter Customer Support needs to set new parameters.
0x1F83 FP_03 F P -- Hardware failure Broken periphery Please contact Enapter Customer Support. Unexpected error, not further specified. Please read the logs for details.
0x3F84 WP_04 W P -- Power Button pressed for longer than 5sec Sticky button Power button is pushed. Please release power button.
0x3F85 WP_05 W P -- Too low battery Please contact Enapter Customer Support. Mainboard battery charge is too low.
0x1F86 FP_06 F P -- Not enough RAM Please contact Enapter Customer Support.
0x108A FC_10 F C P107 Pump broken Please contact Enapter Customer Support. The electrolyte pump may be damaged.
0x1114 FD_20 F D PT101A Pressure drop > 2% Possible hydrogen leak Please contact Enapter Customer Support. Internal pressure transmitter detected a non-nominal pressure drop during the ramp down leakage test.
0x318A WR_10 W R PT105 Pressure > 5barg Water inlet pressure too high Please ensure to reduce the water inlet pressure to below 5 barg.
0x3194 WR_20 W R PT105 Pressure < 1.0barg Water inlet pressure too low Please provide water input pressure to the water inlet.
0x118A FR_10 F R LSHH102A Water level is over very high level switch Electrolyte level is too high Please switch Electrolyser into maintenance mode and decrease the electrolyte level.
0x1194 FR_20 F R LSL102D Water level is below low level switch Electrolyte level too much low Please switch Electrolyser into maintenance mode, drain fully and then fill the electrolyte tank with fresh electrolyte solution.
0x11B2 FR_50 F R LSL102D
LSM102C
Conflict between water level sensors (low and medium level) Please contact Enapter Customer Support. Internal water sensors may be stuck (conflict between low and medium level).
0x11B3 FR_51 F R LSM102C
LSH102B
Conflict between water level sensors (medium and high level) Please contact Enapter Customer Support. Internal water sensors may be stuck (conflict between medium and high level).
0x11B4 FR_52 F R LSH102B
LSHH102A
Conflict between water level sensors (high and very high level) Please contact Enapter Customer Support. Internal water sensors may be stuck (conflict between high and very high level).
0x11A8 FR_40 F R -- Refilling unsuccessful Please contact Enapter Customer Support. Refilling unsuccessful.
0x3195 WR_21 W R -- Refilling timeout Please reboot device and ensure water inlet requirements are met.
0x3196 WR_22 W R -- Refilling failure The refilling failed. Check the water supply system.
0x31B3 WR_51 W R LSL102D Available only in Maintenance Mode Drain completely Electrolyte level is below minimum level. Electrolyser is ready for refill.
0x31B4 WR_52 W R LSL102D Available only in Maintenance Mode Refill to high level Please continue filling the electrolyte.
0x31B5 WR_53 W R LSH102B Electrolyte level is very high, drain to high level. available only in Maintenance Mode Drain to high level Electrolyte level is over high level. Please drain electrolyte to high level.
0x31B6 WR_54 W R -- Drain to medium level Please continue draining the electrolyte.
0x1201 FS_01 F S PSU 48V PSU bad current Please contact Enapter Customer Support. PSU might be broken.
0x120A FS_10 F S PT101A
PSU 48V
Broken membrane Please contact Enapter Customer Support. The membrane inside the stack might be broken.
0x3215 WS_21 W S PT101A Pressure spike > 2% Drifting PT101A Please contact Enapter Customer Support. Pressure mismatch towards stack status has been detected.
0x3216 WS_22 W S LSM102C System works with electrolyte level less than medium one and can not refill (during pressure limit and etc) Refilling not happening Please check the water supply - otherwise, the hydrogen production will stop soon.
0x321E WS_30 W S TT106 Stack voltage is too high Replace electrolyte Replace electrolyte. If the error persists, please contact Enapter Customer Support.
0x128A FT_10 F T TT106 Temperature > 58°C Electrolyte temperature too high Please make sure that air ventilation is unobstructed or cooling liquid cooling loop operating and that ambient temperatures do not exceed device specifications. If the error persists, please contact Enapter Customer Support.
0x3294 WT_20 W T F103A Rotation < 600rpm Electrolyte cooling fan broken Please contact Enapter Customer Support. The electrolyte cooling fan should be checked.
0x228A ET_10 E T TT102A Temperature < 6°C Electrolyte temperature too low Please make sure that room temperature is at least 6°C. Keep the EL powered to ensure the heating routine continues to protect the device internals.
0x330A WU_10 W U PT101A Pressure is > atmospheric pressure + 10% Gas side pressure is not atmospheric Purge line pressure detected. Ramp-Up is not possible. Please check that the purge line is unobstructed.
0x230A EU_10 E U LSM102C Cannot start the heater because the water level in the internal Electrolyser tank is too low. Not enough warmup water Heater can’t be started due to a low electrolyte level. Refill Electrolyser, restart and try again.
0x1403 FX_03 F X PSU 48V No voltage from PSU PSU broken Please contact Enapter Customer Support. PSU failure detected. No voltage on stack.
0x1404 FX_04 F X HASS Current > 58A Stack current too high Please contact Enapter Customer Support. Stack overcurrent detected.
0x1407 FX_07 F X TS108 Temperature > 75°C Electronic board temperature too high The electronic board temperature is too high. Please check and clean ventilation openings. If the error persists, please contact Enapter Customer Support.
0x140B FX_11 F X MCU Temperature Sensor Temperature > 75°C Control Board MCU temperature too high Please make sure that room temperature below 45°C.
0x140C FX_12 F X PT101C Outer hydrogen pressure too high Please contact Enapter Customer Support.
0x140D FX_13 F X H104 High H2 presence detected Please contact Enapter Customer Support.
0x141E FX_30 F X PT105 Water inlet pressure transmitter broken Please contact Enapter Customer Support. The water inlet pressure cannot be measured or bad water inlet pressure.
0x141F FX_31 F X TT102A Electrolyte tank temperature transmitter broken Please contact Enapter Customer Support. The electrolyte tank temperature cannot be measured.
0x1421 FX_33 F X TT106 Electrolyte backflow temperature transmitter broken Please contact Enapter Customer Support. The electrolyte backflow temperature cannot be measured.
0x1423 FX_35 F X PT101C Outer hydrogen pressure transmitter broken Please contact Enapter Customer Support. The outer hydrogen pressure cannot be measured.
0x1424 FX_36 F X F1084B Rotation < 3000rpm Chassis circulation fan broken Please contact Enapter Customer Support. The chassis air circulation fan speed cannot be measured.
0x1425 FX_37 F X F108C Rotation < 3000rpm Electronic compartment cooling fan broken Please contact Enapter Customer Support. The electronic compartment cooling fan speed cannot be measured.
0x1426 FX_38 F X TSH108 Electronic board temperature transmitter broken Please contact Enapter Customer Support. The electronic board temperature cannot be measured.
0x1427 FX_39 F X HASS Current sensor broken Please contact Enapter Customer Support. The stack current cannot be measured.
0x142A FX_42 F X External switch Common trip An error received from Safety Board. Please contact Enapter Customer Support.
0x340E WX_14 W X H104 H2 presence detected Please contact Enapter Customer Support.
0x340F WX_15 W X H104 H2 sensor is regenerating Please contact Enapter Customer Support.
0x3434 WX_52 W X PSU 48V PSU check disabled Please contact Enapter Customer Support.
0x3435 WX_53 W X HASS Stack current check disabled Please contact Enapter Customer Support.
0x3437 WX_55 W X TS108 Electronic board temperature check disabled Please contact Enapter Customer Support.
0x343B WX_59 W X PT105 Inlet pressure check disabled Please contact Enapter Customer Support.
0x343C WX_60 W X TT102A Electrolyte tank temperature check disabled Please contact Enapter Customer Support.
0x343D WX_61 W X FM106 Electrolyte flow meter check disabled Please contact Enapter Customer Support.
0x343E WX_62 W X F103A/V106 Electrolyte cooling check disabled Please contact Enapter Customer Support.
0x343F WX_63 W X TT106 Electrolyte backflow temperature check disabled Please contact Enapter Customer Support.
0x3440 WX_64 W X PT101C Hydrogen outer pressure check disabled Please contact Enapter Customer Support.
0x3441 WX_65 W X F104B Chassis circulation fan check disabled Please contact Enapter Customer Support.
0x3442 WX_66 W X F108C Electronic compartment cooling fan check disabled Please contact Enapter Customer Support.
0x3443 WX_67 W X External switch Dry contact check disabled Please contact Enapter Customer Support.
0x3445 WX_69 W X MCU Temperature Sensor Control Board MCU temperature check disabled Please contact Enapter Customer Support.
0x3446 WX_70 W X H104 H2 sensor check disabled Please contact Enapter Customer Support.
0x148A FF_10 F F -- Frozen pipes Please contact Enapter Customer Support. Electrolyte flow outside pump control limits.
0x1501 FL_01 F L -- Possible hydrogen leak detected Please contact Enapter Customer Support. Pressure readings below nominal values. The device needs to be checked or repaired.
0x350A WL_10 W L PT101A Insufficient pressure drop Insufficient pressure drop. Check that purge line from Electrolyser is not obstructed.
0x358A WO_10 W O PT101C Pressure > 25 barg Outer pressure is too high to run blowdown routine Please reduce outlet pressure to below 25 bar in order to run the blowdown routine.
0x3594 WO_20 W O -- The Blowdown procedure will be started at H2 production start Blowdown Routine Active. Please make sure that purge line is properly connected and leads to a safe area.
0x159E FO_30 F O PT101C The purge line is obstructed or Blowdown failed Please contact Enapter Customer Support. The purge line is obstructed or the adjustable check valve (CV101B) cracking pressure is set incorrectly. Please verify that the purge line is unobstructed, enable Blowdown for the next H2 production cycle and reset the system.
0x360A WH_10 W H ModBus Heartbeat Packet was not received in time Lost ModBus safety heartbeat communication Please check ModBus communication between Electrolyser and controller. Please check if Ethernet cable is properly installed and connection is established.
0x360B WH_11 W H Gateway Heartbeat Packet was not received in time Lost Gateway safety heartbeat communication Please check communication between Gateway and Electrolyser (UCM). Please check if Wi-Fi connection is stable.
0x360C WH_12 W H UCM Heartbeat Packet was not received in time Lost UCM safety heartbeat communication Please contact Enapter Customer Support.
0x368A WZ_10 W Z -- Polarization curve cannot be started Please contact Enapter Customer Support.
0x170A FB_10 F B TE109 Under temperature Recombiner temperature is below operation limits. Please contact Enapter Customer Support.
0x170B FB_11 F B TE109 Over temperature Recombiner temperature is above operation limits. Please contact Enapter Customer Support.
0x1714 FB_20 F B TE109 Under time Recombiner heating is taking too long. Please contact Enapter Customer Support.
0x1715 FB_21 F B TE109 Over time Recombiner cooling is taking too long. Please contact Enapter Customer Support.
0x178A FY_10 F Y Safety Board Invalid communication packet Control Board received invalid communication packet from Safety Board. System now is in Safe State. Power cycle the device to remove error. In case the error persists contact Enapter Support.
0x1794 FY_20 F Y Safety Board Dry contact Safety Board DRY CONTACT was opened. System now is in Safe State. Check the DRY CONTACT safety loop circuit and fix it if required. Error will disappear as soon as DRY CONTACT is closed and device reset.
0x1795 FY_21 F Y Safety Board Communication fail Safety Board experience communication problems with Control Board. System now is in Safe State. Power cycle the device to remove error. In case error persist contact Enapter Support.
0x1796 FY_22 F Y Safety Board Safe State requested by Control Board Control Board requested transition into Safe State. System now is in Safe State. Power cycle the device to remove error. In case error persist contact Enapter Support.
0x1797 FY_23 F Y Safety Board Incompatible Control Board version Safety Board hardware or software is not compatible with Control Board hardware or software. System now is in Safe State. Contact Enapter Support. Do Factory Settings Reset to remove error.
0x1798 FY_24 F Y Safety Board Relay broken Safety Board safety relay does not pass self diagnostics. System now is in Safe State. Contact Enapter Support. Do Factory Settings Reset to remove error.
0x1799 FY_25 F Y Safety Board Proof-test can not be started The Proof-test function was requested while Safety Board was not in the Normal State. System now is in Safe State. Perform Factory Settings Reset to remove the error. In case error persist contact Enapter Support.
0x179A FY_26 F Y Safety Board Proof-test failed The requested Proof-test function failed. System now is in Safe State. System can not be operated. Contact Enapter Support. Do Factory Settings Reset to remove error.
0x179B FY_27 F Y Safety Board Inner pressure transmitter broken Stack pressure transmitter is broken. System now is in Safe State. System can not be operated. Do Factory Settings Reset to remove error. Contact Enapter Support.
0x179C FY_28 F Y Safety Board Wrong Control Board Safety Board was connected to wrong Control Board. System now is in Safe State. System can not be operated. Contact Enapter Support.
0x179D FY_29 F Y Safety Board Recombiner Chamber Temperature Sensor broken Recombiner Chamber Temperature Sensor is broken. System now is in Safe State. System can not be operated. Do Factory Settings Reset to remove error. Contact Enapter Support.
0x179E FY_30 F Y Safety Board Tachometer or Fan broken Tachometer and / or Fan are broken. System now is in Safe State. System can not be operated. Do Factory Settings Reset to remove error. Contact Enapter Support.
0x179F FY_31 F Y Safety Board Safety Board Temperature Sensor broken Safety Board Temperature Sensor is broken. System now is in Safe State. System can not be operated. Do Factory Settings Reset to remove error. Contact Enapter Support.
0x1721 FY_33 F Y Safety Board Brownout Safety board detects brownout (less then 22.5V) and halts until power restored. Contact Enapter Support.
0x17B3 FY_51 F Y Safety Board SIF1: Hydrogen stack overpressure Safety board detected overpressure in the hydrogen stack. System now is in Safe State. System cannot be operated. Do Factory Settings Reset to remove error.
0x17B4 FY_52 F Y Safety Board SIF2: Recombiner chamber overtemperature Safety board detected overtemperature in the recombiner chamber. System now is in Safe State. System cannot be operated. Do Factory Settings Reset to remove error.
0x17B5 FY_53 F Y Safety Board SIF3: Water leakage detection Safety board detected water leakage inside device. System now is in Safe State. System cannot be operated. Do Factory Settings Reset to remove error.
0x17B6 FY_54 F Y Safety Board SIF4: Tank overpressure Safety board detected overpressure in process electrolyte tank. System now is in Safe State. System cannot be operated. Do Factory Settings Reset to remove error.
0x17B7 FY_55 F Y Safety Board SIF5: Dilution fan for hydrogen concentration Safety board detected malfunction of the fan. System now is in Safe State. System cannot be operated. Do Factory Settings Reset to remove error.
0x17B8 FY_56 F Y Safety Board SIF6: Safety Electronic Board temperature Safety board detected PCB overtemperature. System now is in Safe State. System cannot be operated. Do Factory Settings Reset to remove error.

# 📈 Remote Monitoring and Control

# Introduction

  • Electrolyser EL 4.0 comes with pre-installed UCM (Universal Communication Module) that allows users to monitor the device. Over-the-air updates ensure that the latest protocols and security fixes are supported.

  • Pre-installed UCM connects to the Enapter Gateway and sends performance and error data to the Enapter Cloud. Data is stored in a time series database which displays it in real-time on customizable dashboards.

  • Enapter’s mobile application ensures quick and easy installation of an energy system. Users can manage the EL 4.0 via the mobile app and receive push notifications, warning of any energy system’s issues.

# Network Requirements

# WI-Fi Requirements

  • 802.11a/b/g/n (2.4 GHz only)

  • 802.12 WEP, WPA, WPA2 Personal (Pre-shared key)

  • Wi-Fi client isolation must be disabled

Note

No captive portal or WPA2 Enterprise supported.

General Wi-Fi Note

The Enapter Cloud connection is based on wireless communication, and therefore functionality can be affected by distance between devices, obstructions between the devices, and interference. The communication module inside your Electrolyser works in station mode and utilizes the Wi-Fi channel set in your infrastructure Wi-Fi router for using SSID. You are responsible for selecting the correct channel according to the local radio regulations.

# TCP/IP Network Requirements

Port Protocol Destination Host
(IP-Address / Range or Name)
80 TCP 193.9.249.0/24,
95.168.174.108,
95.168.174.212,
95.168.174.213
(api.enapter.com)
443 TCP 193.9.249.0/24,
95.168.174.108,
95.168.174.212,
95.168.174.213
(api.enapter.com)
123 UDP 193.9.249.0/24,
95.168.174.108,
95.168.174.212,
95.168.174.213
(ntp.enapter.com)
8883 TCP 193.9.249.0/24,
95.168.174.108,
95.168.174.212,
95.168.174.213
(mqtt.enapter.com)
1883 TCP 193.9.249.0/24,
95.168.174.108,
95.168.174.212,
95.168.174.213
(mqtt.enapter.com)

Note

Firewall must be stateful.

# Connecting your Electrolyser to Wi-Fi

To connect your Electrolyser EL 4.0 to a wireless network, follow steps in the iOS or Android Mobile Application guides below. Please note, the QR-code or preinstalled UCM’s ID and PIN are required when connecting to Wi-Fi as well as credentials for the 2,4 GHz Wi-Fi network.

# 🕸️ Dryer Control Network

For more information please check Dryer Control Network (opens new window) Documentation.

# 🔌 Modbus TCP Interface

In case you want to monitor and manage your device with the Modbus TCP interface check out the latest registers map guide and use cases:

Warning

Concurrent connections to Electrolyser EL 4.0 for Modbus TCP interface limited to two. In case if you are experiencing connection refuse issues with Modbus TCP, you need ensure that there are only two connections are used for communication.

Warning

Modbus TCP works over an insecure connection and was designed for usage in isolated Local Area Networks for Operation, Administration and Management. Please take into account that connection to public networks such as the Internet is not recommended for security reasons.

# Examples

The sample Modbus TCP Python scripts are available at our Github Page (opens new window) under Apache 2.0 License.

# 🏭 Integration With SCADA

# How to Connect Electrolyser to SCADA?

SCADA is a control system architecture comprising of computers, networked data communications, and graphical user interfaces (GUI) for high-level process supervisory management.

The EL 4.0 Electrolyser can be integrated into SCADA system with Modbus TCP protocol. Alternatively MQTT interface can be used when Enapter Gateway (opens new window) is used.

# Modbus TCP SCADA / PLC Connection

# With Dryer Control Network (DCN)
SCADA or PLC connect with DCN

In this case, a Dryer and Electrolyser or Electrolysers are connected over the Dryer Control Network (opens new window). The dryer can be monitored and controlled using the Modbus TCP of any Electrolyser in the Dryer Control Network.

# Standalone (Without The Dryer Control Network)
SCADA or PLC connect without DCN

In this case, the Dryer will be fully automatic with no monitoring and control.

# MQTT Interface SCADA / PLC Connection

SCADA or PLC connect

In this case the Dryer and Electrolyser or Electrolysers are connected over MQTT protocol using Enapter Gateway (opens new window). The dryer can be monitored and controlled. Also, the Enapter Rule Engine can be used to implement various rules to control and monitor the Dryer.

# Connection Testing

Schneider Electric Modbus Tester (opens new window) is a convenient way to test Modbus TCP connection on Windows PC.

Modbus Tester Connection

Note

The DHCP server or static IP address must be configured and enabled on the PC connected to the Electrolyser.

If you are using a router connected to the Electrolyser the DHCP mode must be enabled.

Warning

If the connected device does not have Auto MDI-X (auto crossover), use an Ethernet crossover cable to connect it to the Electrolyser EL 4.0.

# Example: Reading Heartbeat Register

Modbus Tester

  1. TCP/IP Address or URL - enter the IP address of Electrolyser.

  2. Sample mode:

    • Manual - manual reading.
    • Scheduled - rereading.
  3. Sample Rate in ms - Rereading period.

2000 ms = 2 s

  1. Data type - Holding or Input registers.

    The list of all Holding and Input registers can be found at Latest Modbus TCP Interface.

    Register number must be plus 1.

    Heartbeat ModBus Timeout - 4600 + 1 = 4601

  2. Read:

    • for Manual - single read.
    • for Scheduled - start of rereading.
  3. Read value.

Read value = 2 = 2000 ms.

# Syslog

Syslog is a Message Logging Standard by which almost any device or application can send data about status, events, diagnostics, and more.

Syslogging can be enabled in two ways:

  • Using Modbus register.
  • Using Web GUI of Electrolyser.

# Using Modbus Register

The following registers need to be configured to enable Syslog using Modbus:

  1. Holding Register 4042
  • Data type - Uint32
  • Name - System logs
  • Severity:
    • 0 = disable logging (default)
    • 1 = only fatal errors
    • 2 = fatal errors and errors
    • 3 = warnings and more important
    • 4 = everything before and important messages
    • 5 = all messages, except internal debug ones
    • 6 = all messages
  1. Holding Register 4044
  • Data type - Uint32
  • Name - Syslog IP Address
  • Default value 255.255.255.255 (Broadcast)
  1. Holding Register 4046
  • Data type - Uint16
  • Name - Syslog Port
  • Default port 514

# Using Web GUI

System logs can be configured using the Electrolyser Web GUI (opens new window). Please check the Syslog Configuration paragraph of the Web GUI documentation.

# Receiving Syslogs

Tftpd64 (opens new window) can be handy to receive system logs on Windows PC.

Tftpd64
  • Enable system logging using Modbus Registers or Web GUI.
  • Tap on the Syslog server
  • You will receive system logs depending on chosen severity.

# 💧 Refilling and Draining

EL40 Refilling Instructions

Note

To fill and drain the electrolyte described in this section, you need an internet connection and Enapter mobile application. Filling and draining the electrolyte can also be done without internet connection using Enapter Web GUI (opens new window).

# The First Refilling

Warning

Please check Material Safety Data Sheet (MSDS) for Potassium Hydroxide Aqueous Solution < 1 wt. %.

Before DI water is added automatically, the electrolyser needs to be initially filled with electrolyte.

You will need:

  • Mobile phone with installed Enapter App (or assess to Web GUI).
  • Safety glasses and nitrile gloves.
  • Prepared KOH solution in the electrolyte bag (2L, 1,54%).
  • Supplied refilling pipe.

Follow these steps to complete the first refilling of the electrolyte:

  • Step 1. Put on PPE. Minimum Equipment Requirements are safety goggles to protect from splash and nitrile gloves. Ensure your working area is clean to avoid chemical contamination and potential hazard exposure.
  • Step 2. Connect electrolyser to Enapter App and open it’s dashboard (or access electrolyser’s Web GUI).
  • Step 3. Electrolyser must be in Maintenance mode and the electrolyte tank must be empty.
  • Step 4. Get electrolyte bag valve through the perforated hole in the box. Connect refilling pipe to the electrolyte bag using special connector.
  • Step 5. Fully insert the refilling pipe into the FILL/DRAIN port.
  • Step 6. Carefully raise the bag with the filling solution above the device. Never lift electrolyte above your eye level. The solution will start filling the internal electrolyte tank immediately. If this does not happen, ensure the O2 VENT line is not obstructed.
  • Step 7. Pour out all electrolyte from the electrolyte bag until medium level is reached.
  • Step 8. Disconnect refilling pipe from the FILL/DRAIN port by pressing down on the button on the port.
  • Step 9. Confirm that refilling is finished by pressing the Exit button in the App or Web GUI.
  • Step 10. Electrolyser will be filled with required amount of water automatically.

# Electrolyte Draining

The module must be drained for transport, installation, and before the routine changing of the electrolyte in Electrolyser to prolong system life.

You will need:

  • Mobile phone with installed Enapter App (or assess to Web GUI).
  • Safety glasses and nitrile gloves.
  • 2 clean 5L containers (for old electrolyte solution and flushing water).
  • Supplied draining pipe.

Follow these steps to drain Electrolyser:

  • Step 1. Put on PPE. Minimum Equipment Requirements are safety goggles to protect from splash and nitrile gloves. Ensure your working area is clean to avoid chemical contamination and potential hazard exposure.
  • Step 2. Connect electrolyser to Enapter App and open it’s dashboard (or access electrolyser’s Web GUI).
  • Step 3. Enable Maintenance mode using the Enapter App or Web GUI.
  • Step 4. Prepare the container to catch the drained liquid and insert the end of the draining pipe into it.
  • Step 5. Fully insert the draining pipe into the FILL/DRAIN port. The solution will start pouring out immediately.
  • Step 6. Drain until the App shows an empty tank and follow the steps provided by the Enapter App for flush electrolyser.
  • Step 7. Once the flushing is finished, prepare the second container to catch the drained liquid again and insert the end of the draining pipe into it.
  • Step 8. Fully insert the draining pipe into the FILL/DRAIN port. The solution will start pouring out immediately.
  • Step 9. Disconnect refilling pipe from the FILL/DRAIN port by pressing down the button on the port.
  • Step 10. Confirm finish of draining by pressing the Continue button in the App or Web GUI.
  • Step 11. Electrolyser now is ready for maintenance.

Warning

Thermal hazard! Avoid contact with the heated electrolyte solution.

# ⚙️ Operation Functions

# Altitude Compensation

Our systems are installed in different places over the world but calibrated in Pisa and later will be calibrated in Saerbeck.

All places have different altitudes and this might affect the pressure reading values from the sensors.

This can be done using Web GUI (opens new window) or Modbus TCP Interface.

To set altitude using Modbus TCP Interface you need to use Modbus Holding register #4142.

# Preheat

Preheat allows you to prepare your Electrolyser to ramp up in a faster way.

It is usually takes about 20 minutes from 20 deg to 55 deg to reach a nominal production rate.

This can be done using Web GUI (opens new window), Enapter Cloud (opens new window) or Modbus TCP Interface.

To activate preheat using Modbus TCP Interface you need to use Modbus Holding register #1014.

# Stand-By Mode

When your Electrolyser in Stand-By we have two possible actions for the Start/Stop button:

  1. Long press of the Start/Stop button (more than two seconds) will enable the system to re-start to reach the Max Pressure.
  2. The short press of the Start/Stop button will turn the system off.

# Factory Settings Reset

Warning

Factory Settings Reset is available only when the Stack is depressurized. Inner Hydrogen Pressure measured from PT101A must be less 2 barg.

Warning

If UCM is switched OFF using the Wi-Fi Button you will not be able to do a Factory Settings Reset properly. Please be sure that UCM is switched ON.

Note

During Factory Setting Reset you will hear the buzzer. For more information please check Sound Codes Documentation.

After Fatal Error event, the system shall only be restored through the Factory Settings Reset command.

To enable Factory Settings Reset:

  • Depressurise the Stack. Inner Hydrogen Pressure must be < 2 barg.
  • Turn off the device.
  • Press and hold the Start/Stop button and turn on the device.
  • Hold the button. LEDs start blinking one after another.
  • Release the button. All LEDs will blink once.
  • Factory Settings Reset started. Device will be automatically rebooted. All LEDs blink trice.

There will be a warning if the Start/Stop button has not been released: WARNING WP_04: STICKY BUTTON.

After the Factory Settings Reset your Electrolyser will move to Maintenance Mode if water level is low than the low level. If water level is higher than the low level the Electrolyser will remain in Operation Mode.

# Derating and Uprating of Production Rate

If the ambient temperature is too high, the Electrolyser will automatically reduce its production rate by increments of 10% until internal temperatures return to normal. Once ambient conditions return to normal, the Electrolyser will automatically up-rate to the production rate that allows for its normal internal temperatures.

# Wi-Fi Button

Using this button you can switch the UCM OFF/ON.

This can be needed if:

Warning

Be sure that UCM switched ON while you enabling or removing Dryer Control Network (opens new window).

# 🔧 Maintenance Functions

Electrolyser EL 4.0 is designed to provide many hours of service with minimal maintenance. Proper care and maintenance by qualified personnel help to maximize the operating hours of the unit. The Mobile Application, Enapter Cloud and Web GUI help to execute the refilling process.

Action Period Instruction
Inspect Physical Deterioration Once per year The unit should be inspected for obvious signs of physical damages.
Leakage Testing Once per year All hydrogen connections must be tested for leakages. Enapter recommends to use one of the techniques listed in Appendix I in Owner’s manual.
Electrolyte Replacement Once per year
(check the note below)
For maintaining the device after commissioning, the internal tank must be emptied and new electrolyte must be filled into the device. For more information, please refer to the Electrolyte Draining section, and then follow the instructions for the The First Refilling of the electrolyte.
Cleaning Once per year When performing the routine maintenance processes and checks, the machine should be inspected and cleaned. Start by carefully using a vacuum cleaner (not included) to clean out the ventilation openings/grills. Afterward, use a damp cloth (no acids, aggressive or abrasive substances) to clean the outside of the unit.

Note

Depending on the frequency of use it is possible that the internal tank needs to be emptied and refilled more than once a year. By connecting your device to the Enapter Cloud (opens new window), it is possible to receive alerts when the stack’s voltage starts to increase – this typically means an electrolyte change is needed. The electrolyte change will help the electrolytic stack to return to a lower voltage, decreasing the power consumption of the device and increasing its lifetime.

# 🦺 Safety Functions

# Safety Heartbeat

This functionality increases safety in cases of loss of control by Enapter Gateway or any 3rd party Modbus master device.

Safety Heartbeat is a periodic signal generated by Enapter Gateway or any Modbus master device (i.e PLC) to indicate continuous connection with Electrolyser.

If Electrolyser does not receive the heartbeat in a time (heartbeat period) — the machine will shut down normally. Loss of the signal may happen when Gateway or PLC is powered off, or when there is connection issue.

# EL 4.0 Heartbeat

To activate Heartbeat on the EL 4.0 you need to change Heartbeat parameters. To do it use Modbus Holding Register #4600 (for Modbus master) or #4602 (for Enapter Gateway) and #4604 (for UCM).

Parameters:

Heartbeat_ucmtimeout_s - timeout for UCM Heartbeat in seconds. Default value = 0 (disabled).

Heartbeat_gatewaytimeout_s - timeout for Gateway Heartbeat in seconds. Default value = 0 (disabled).

Heartbeat_modbustimeout_s - timeout for Modbus Heartbeat in seconds. Default value = 0 (disabled).

These parameters can also be changed using Web GUI (opens new window). Navigate to Configuration bar and set Heartbeat timeouts.

# UCM Heartbeat

By default UCM Heartbeat is set to 0 (disabled).

Warning

If you set UCM Heartbeat do not switch OFF the UCM using Wi-Fi Button.

# Gateway Heartbeat

How to activate Safety Heartbeat on the Gateway: please check Gateway Software Documentation.

# Modbus Heartbeat

How to activate Safety Heartbeat using Modbus protocol - please check the example of Writing Heartbeat Modbus Timeout.

# Blowdown Routine

Depending on the model of Electrolyser EL 4.0 the device may not have Blowdown Routine.

Warning

If Blowdown Routine is not available, an error will be displayed when trying to execute the command.

This automatic routine will appear if the Electrolyser has not been in STEADY or RAMP UP mode for a certain period of time; in other words, if the Electrolyser has not been in use for some time. After not being in use, the mechanical spring relief valve on the outlet of Electrolyser might not work properly when the 29 bar is reached, and it might need extra pressure to open the first time.

There will be a warning that notifies when the routine starts: WARNING “WO_20”.

The Blowdown Routine doesn’t interfere with the normal ramp up routine, but only makes some changes to the safety routine checks.

The Blowdown Routine can be enabled using Enapter Cloud (opens new window), Electrolyser Web GUI (opens new window), Enapter Mobile App or EL 4.0 Modbus TCP Interface.

To activate Blowdown using Modbus TCP Interface use Modbus Holding register #1010.

# Safety Proof-Tests

Proof-Tests are needed to check that Safety Board operates well.

Proof-Tests can be activated using Web GUI (opens new window), Enapter Mobile Application (opens new window), Enapter Cloud (opens new window) and Modbus TCP.

The list of Safety Integrated Function (SIF) Proof-Tests:

  • SIF 1 - HYDROGEN STACK OVERPRESSURE
  • SIF 2 - RECOMBINER CHAMBER OVERTEMPERATURE
  • SIF 3 - WATER LEAKAGE DETECTION
  • SIF 4 - TANK OVERPRESSURE
  • SIF 5 - DILUTION FAN FOR HYDROGEN CONCENTRATION
  • SIF 6 - SAFETY ELECTRONIC BOARD TEMPERATURE

Warning

All SIF Proof-Tests can be executed only in IDLE state except SIF 5.

# 💻 Firmware

# Firmware 3.0.0

# How to Update the Firmware?

Note

If the Site has the Enapter Gateway, it needs to be updated to version 1.8.9 or higher.

Note

Make sure you have physical access to the device before starting the update process.

Warning

Do not power off the device during the firmware update.

Warning

Remove Dryer Control Network (opens new window) before updating the firmware.

Note

During firmware update you will hear the buzzer. For more information please check Sound Codes Documentation.

# Updating the Firmware Using Enapter Cloud

  1. Login into Enapter Cloud (opens new window).
  2. Open your Site and navigate to the Electrolyser page you want to update.
  3. At the left sidebar click on the Update Firmware button at the Firmware Info section.
  4. In opened window click on the Check for updates button.
  5. If you have the latest firmware version you will see You have the latest version.
  6. If update is available you will see Change Log.
  7. Click the Update button to update the firmware.
  8. Wait until the update is complete. This can take a while.

# Updating the Firmware Using Enapter Mobile App

  1. Login into Enapter Mobile App.
  2. Open your Site and navigate to Electrolyser’s page you want to update.
  3. Navigate to the About tab (ℹ️) and click on the Firmware button.
  4. In opened tab click on the Check for Updates button.
  5. If you have the latest firmware version you will see You have the latest version.
  6. If update is available you will see Change Log.
  7. Click the Update button to update the firmware.
  8. Wait until the update complete. This can take a while.

# Updating the Firmware Using Electrolyser Web GUI

Important

Never upload firmware files received from an untrusted source. Enapter is not responsible for any misbehavior or harm caused by untrusted firmware usage or violating update instructions. Contact Enapter Customer Support with any questions and to ensure that correct firmware files are used.

It is always recommended to update Electrolyser firmware using Enapter Cloud and Mobile Application. However these types of update require stable internet connection. In cases when it is not possible to have your Electrolyser connected to Enapter Cloud it is possible to update Electrolyser firmware using Web GUI.

To perform update:

  1. Save and unzip the received firmware package to local hard drive of your computer so that you have two files named fw_ucm_0xXXXX_X.X.X.ena and fw_cbd_0xXXXX_X.X.X.ena next to each other.
  2. Open Web GUI (opens new window) of your Electrolyser.
  3. Navigate to System Parameters tab.
  4. Click Update link. The Upload Firmware screen will appear.

Web GUI - Upload Firmware
  1. Drag and drop or Select file with UCM firmware named fw_ucm_0xXXXX_X.X.X.ena from your local hard drive.
  2. On the screen you will see the confirmation that the firmware file is recognized by showing the UCM Firmware version.
  3. Press Upload button and wait for the process to finish both the Upload and Installation steps. It will take up to 10 minutes. Don’t turn the Electrolyser off and don’t close the browser.
  4. Press Done after receiving the message UCM firmware was updated successfully.
  5. Drag and drop or Select file with UCM firmware named fw_cbd_0xXXXX_X.X.X.ena.
  6. On the screen you will see the confirmation that the firmware file recognized by showing the Control Board Firmware version.
  7. Press Upload button and wait for the process to finish both the Upload and Installation steps. It will take up to 10 minutes. Don’t turn Electrolyser off and don’t close the browser.
  8. Press Done after you receive the message Control Board was updated successfully.

# 🐞 Known Issues

# Known Hardware Bugs

No Bugs

# Known Software Bug

  1. Depending on the model of Electrolyser EL 4.0 the device may do not have Blowdown Routine.

    • If Blowdown Routine is not available, an error will be displayed when trying to execute the command.