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Emergency Command Center Manual —
P/N LS10001-000FL-E:D 9/3/2014
Installation
Output Circuits
2.6 Output Circuits
2.6.1 Relays
MNS Active Relay - TB1
The main control board provides a Form-C MNS Active relay.
Trouble Relay - TB2
The main control board provides a Form-C Trouble relay for independent, general system fault
monitoring. This relay is ‘fail safe’, meaning that it is normally energized. Should system power
shut off, this relay will de-energize, transferring its contacts. The Trouble Relay can be pro-
grammed to track the AC Loss Relay and transfer on AC loss conditions or ignore AC loss condi-
tions.
AC Power Loss Relay - TB3
The main control board provides a Form-C AC Power Loss relay.
Figure 2.12 MNS Active Relay
TB1
ec
ca
cr
l.w
m
f
Shown in normal,
Inactive condition
Figure 2.13 Trouble Relay
TB2
ec
ct
rb
l.w
m
f
Shown in energized,
non trouble condition
Figure 2.14 AC Power Loss Relay
TB3
Shown in normal
AC Power condition
ec
ca
cr
l.w
m
f
