CHAPTER 5: POWERING UP THE D400 POWER SUPPLY ALARMS
D400 SUBSTATION GATEWAY USER’S MANUAL GENERAL 81
System fail alarm
The D400 includes a System Fail contact closure to provide an external indication of
system status. The System Fail alarm is also indicated by the CPU Ready LED on the front
panel of the main module turning off.
The indicator or audible alarm can be wired to operate as follows:
• ON when system failure has occurred
• ON when system is functioning properly
The System Fail contact closure provides three contacts (terminals 4, 5 and 6) on terminal
block TB2.
Contact closure rated for 0.1 A @ 300 V maximum.
To connect the
System Fail relay
1. Remove the terminal block protective plastic cover.
2. Wire a lamp to terminals 4, 5 and 6 on terminal block TB2 as follows:
For proper connection, the recommended tool torque settings for power terminal
screws are 10.8 in-lb [1.22 Nm].
3. Replace the terminal block protective plastic cover.
Figure 50: System Fail Alarm Connection
To enable the indicator when system is… Wire the lamp between…
Failed Terminals 4 and 5
Functioning properly Terminals 5 and 6
Light ON
after failure
Light ON
when operational
Station Battery / Power Source
Power
Fail
System
Fail
TB2
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