Alarm relay and led operation, User’s guide, Battery management system – APC Battery Management System User Manual
Page 177
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USER’S GUIDE
Battery Management System
170
Alarm Relay and LED Operation
Situation/Condition
Alarm Relay
Status LEDs
N
OTE
:
Alarm Relay
operates as a “Fail-
Safe” device that is
energized during
non-alarmed periods.
Normally Open
Contacts (de-
energized)
Management
Controller
Batteries
Charger
Environment
Normal Operations
Closed
(energized)
On
On
On
On
Management System
Fault
Open
(de-energized)
Flash
On
On
On
High or low
environment
temperature or
auxiliary environment
sensor alarm
Open
(de-energized)
On
On
On
Flash
Charger Fault - High
or low charging
voltage or high ripple
current
Open
On
On
Flash
On
Connection fuse or
wiring fault
Open
Flash
On
On
On
Battery Fault - Low
capacity, high ohmic
value, shorted cell or
thermal runaway
Open
On
Flash
On
On
Missing or Faulty
Sensor
Open
Flash
On
On
On
System off or loss of
input power
Open
Off
Off
Off
Off