Version
Document Title
Release Date
02
Narrow Body EL2.1 (REV. A)
–
Owner's Manual
2021-03-22
EL 2.1 -
Owner’s
Manual - Rev.02
–
Mar 2021
27
Dry Contact Connection Guide (Optional)
Connect the male connector to the female port on the device, labelled "DRY CON.". The dry contacts
are normally-closed type.
The pins are, from top to bottom, S2, COM2, S1, COM1. This allows the EL to not only receive a dry
contact signal but also to pass it on to the next Enapter device, allowing the installer/operator to daisy
chain as many Enapter devices as wanted to a common safety signal.
In order to use the dry contact to shut down the hydrogen
production of the device, connect a normally closed dry
contact circuit to Circuit 1, using the specially supplied plug.
This circuit is generally achieved by a relay system that is
triggered open/closed by signals sent from a switch or sensor
used to ensure system safety. If the circuit is interrupted (i.e.
the dry contact is opened), the system will immediately cease
all hydrogen production and return to a safe state by purging.
To pass the signal on to the next Enapter device, connect the
two free contacts (Circuit 2) to the nearest Enapter device
(connecting it to the Circuit 1 of the next device). In case the
safety circuit is triggered by an opened contact, all connected
systems will stop. Opening the Dry Contact circuit will cause
the stack to be immediately de-energised and the Electrolyser
to depressurise and to go into fatal error.
Dry contacts should
not be used for normal start and stop operation
. Unexpected
power cuts to the stack without normal ramp downs can
shorten the device's lifetime and damage the system!
Circuit 1
Circuit 2
