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Note that alarm and warning events from the PowerView do not require acknowledgement and will
not cause the audible alarm to sound.
4.3.6 Alarm/warning annunciation (Remote)
The PDU can annunciate alarms/warning remotely via two sets of Form-C alarm relay contacts. (See
Section 3.4.6.3 for the wiring details.) These relay contacts are designated as follows:
Summary Alarm Contacts
Unacknowledged Events Contacts
4.3.6.1 The Summary Alarm contacts:
The Summary Alarm contacts will be in the alarm state if there are one or more active warnings or
alarms present. The Summary Alarm contact follows the state of the alarm/warning ring light, i.e.,
they should be in the alarm state when the alarm/warning ring light is red (solid or blinking) and
should be in the normal state when the alarm/warning ring light is green.
4.3.6.2 The Unacknowledged Events contacts:
The Unacknowledged Events contacts will be in the alarm state only when there are one or more
alarm/warning events in the log that require acknowledgement. The Unacknowledged Events
contacts should be in the alarm state when the audible alarm is sounding. See the caveats about
the audible alarm above in Section 4.3.5. Also note that disabling the audible alarm does not
disable the Unacknowledged Events contacts.
Note that both sets of alarm contacts will be in the normal state if power is lost to the equipment.
4.3.7 Group Fault
The Group Fault occurs when there are connectivity problems in a daughter board. Connectivity is
monitored in two groups of daughter boards, assigned by slot depending on chassis type.
Table 4-1: Group Fault slot assignment
Chassis
6 slots
2 slots
Users are alerted to Group Fault in the following ways:
Alerted with both the ring light and buzzer, as described in Section 4.3.5.
Noted in the event log with the description "MCB [ID] ACB Group [ID] Fault, with the ID's related
to the MCB or ACB Group where the fault occurs
Meter readings on the GUI will stop updating
The Group Fault needs to be resolved by ABB Service. If this fault occurs, please contact ABB Service for
resolution.
Group 1
Slots 1,2 and 3
Slot 1
Group 2
Slots 4,5 and 6
Slot 2
Power Distribution Unit│94-1100-00002874 A0 EN 33
TruFit™
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