Introduction page 1 — 11
Users Manual
1.5.3.1 LED Alphanumeric Indicators
Fourteen alphabetically labeled LEDs provide detailed information on UPS status as follows:
A:Emergency shutdown
This red LED indicates that the emergency power off (EPO) or remote emergency power off (REPO) has been
activated. See section 2.12.1, Emergency Shutdown.
B:Rectifier/charger on
This green LED indicates that the rectifier/battery charger is on.
C:Rectifier/charger fault
This red LED indicates an alarm condition within the rectifier/battery charger. it indicates the presence of one of the
following fault conditions:
◗Input circuit breaker Q1 open
◗Input power protection fuse blown
◗Rectifier/battery charger over-temperature
◗Battery charge overcurrent
◗Battery overvoltage
◗Rectifier/battery charger control board fault
◗Power supply board fault
D:Main AC input (mains 1) outside tolerance
This orange LED indicates that the main AC input (mains 1) source is outside tolerance (voltage and/or frequency
too high or too low).
E:Reserved for future use.
F:Battery temperature outside tolerance
This orange LED indicates that the ambient temperature of the battery is too high or too low.
G:Battery charging
This orange LED indicates that the battery is being recharged. This LED functions only when the connected battery
is of the vented lead-acid type (sealed lead-acid batteries will not activate this signal).
H:Inverter fault
This red LED indicates an alarm condition in the inverter, which may be one or more of the following conditions:
◗Inverter shutdown due to output voltage out of tolerance
◗Inverter output protection fuse blown
◗Inverter leg fault
◗Inverter output transformer over-temperature
◗Inverter leg over-temperature
◗Internal clock fault
◗Inverter control board fault
◗Power supply board fault