GAI-Tronics 12579-003 Monitored Relay Module (MRM) - Manual (Page 5)

Pub. 42004-716L2C
Model 12579-003 Monitored Relay Module Page 5 of 16
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Each connector corresponds to a single output (TB1 is used for output #1, TB2 is used for output #2,
etc.). If fewer than eight supervised relay-contact outputs are required, the unused outputs may be used to
receive inputs (dry contact closures or non-supervised 24 V dc wet contact closures) from field devices.
In this case, connections with these field devices are made at connectors TB1 through TB8 of the 69251-
201 Monitored-In-8 PCBA. Each of these outputs may be configured to operate in one of six modes.
Two of these six modes are used to control signaling devices, while the remaining four modes are used to
receive inputs (contact closures) from field devices.
Each mode requires a unique connection scheme between the external field devices and the
appropriate connector on the MRM. The connection scheme for each mode is described below.
Since the connection scheme is independent of which output is used, only Output #1 will be
discussed.
To ensure proper termination, ferrules must be crimped on the ends of all conductors that are terminated
on the terminal blocks. The size of the ferrule is dependent upon the size of the conductor used and can
be sourced from any supplier such as Phoenix, Altec or Weidmuller. The terminals accept a maximum
conductor size of No. 12 AWG and a minimum conductor size of No. 28 AWG.