Vertiv
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+24 VDC Power System User Manual (Section 6013)
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Rev. G
48
External Alarms
Nine (9) Form-C alarm relay contacts are provided. These alarm relays are mapped to MCA alarms as shown in
the following chart. Refer to “External Alarm, Reference, and Control Connections” in "Making Electrical
Connections" of the separate INSTALLATION INSTRUCTIONS (SECTION 6012) for location and operation of
the external alarm contacts. Refer to the following for alarm conditions.
Power System
List No.
10
11
12
13
MCA
Configuration
No.
534876
534877
534878
534879
Relay K1
Major
Alarm
Major
Alarm
Major
Alarm
Major
Alarm
Relay K2
Minor
Alarm
Minor
Alarm
Minor
Alarm
Minor
Alarm
Relay K3
High
Voltage 1
Alarm
High
Voltage 1
Alarm
High
Voltage 1
Alarm
Test/EQ
Mode
Indication
2
Relay K4
High
Voltage 2
Alarm
Rectifier
Module
Fail Major
Alarm
MCA
Fail
Alarm
Fuse
Alarm
Relay K5
Battery
On
Discharge
Alarm
Battery
On
Discharge
Alarm
Battery
On
Discharge
Alarm
Battery
On
Discharge
Alarm
Relay K6
50%
Battery
On
Discharge
Alarm
Rectifier
Module
Fail
Minor
Alarm
Very Low
Voltage
Alarm
AC Fail
Major
Alarm
Relay K7
AC
Fail
Alarm
AC
Fail
Alarm
AC
Fail
Alarm
AC
Fail
Alarm
Relay K8
MCA
Audible
Alarm
MCA
Audible
Alarm
Fuse
Alarm
LVD
Alarm
Relay K9
Test/EQ
Mode
Indication
Fuse
Alarm
Rectifier
Module
Fail
Alarm
Test/EQ
Mode
Indication