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ERA® WCS and e-POI Subracks and Power Supply Unit Installation Guide
© June 2021 CommScope, Inc.
Page 15
WCS-2 and WCS-4 Subrack Overview
WCS Subrack Alarm Connector
External alarms are connected to the WCS using a connector inserted into the alarms port located on the rear
of the WCS.
The alarm connector on the WCS-4 and WCS-2 Subracks has the following inputs:
•
four opto-isolated (chassis-ground referenced) dry contact inputs to monitor external devices. The alarm
state is activated when the alarm input is pulled to ground. The alarm input is referenced to chassis
ground, and the alarm ground is tied to the chassis ground.
•
a Summary Alarm Relay that energizes when specific alarms are triggered-the thresholds, shown in the
following graphic. The Summary Alarm state changes whenever there is an alarm on the system and
returns to its default state when there are no alarms. Depending on which contacts you use the default
state is either Normally Closed or Normally Open.
The alarm connector on the WCS-4 and WCS-2 Subracks has the following output:
•
The external alarm output is activated at the CAN whenever there is a critical or major alarm in the
system. The alarm output is provided by a relay. Both normally open and normally closed terminals are
available.
The following table shows the alarm connector details for the system parameters.
The following table shows the alarm connector details for the connectable conductors.
Included in the box, the mating connector for the Alarm connector (header) is Weidmuller part
1748040000.
NC
COM
NO
ALARMS
1
2
3
4
5
6
Relay COM
GND
IN 1
IN 2
IN 3
IN 4
Relay NO
Relay NC
Summary Alarm
0.8 A max
30 Vdc max