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Pin assignment of alarm relay
A break in contact is reported via the relay contact :
The failure of at least one of the two supply voltages.
The break link status of at least one switch port.
3.1.4 Fitting the device, grounding
Install the system in a dry and clean area to protect the switch to
get exposed with dirt.
Plug the connector to the power supply plug then turn on the power
supply.
Ground
The chassis is grounded via a separate ground nut (M3).
Use toothed locking washers for a good electrical connection.
