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SDU AC-A Series
A272-290 Rev. 5 07/2018
8.0 Diagnostics
Condition Description LED Diagnostics Alarm
BACK-UP MODE
UPS in on back-up mode due
to AC Loss
YELLOW
Slow beeping. UPS sounds until AC
utility power recovers.
AC MODE
Normal condition source
supplied by AC Mains
GREEN No Alarm
AC MODE OVERLOAD
Load around 110% of it's rated
capacity
GREEN/RED
Alarm is ON for 4 seconds / OFF for 0.8
seconds, until load is removed. UPS
will not shut down.
Load > 120% of it's rated
capacity
GREEN/RED
After continuous alarm for 30 seconds,
the UPS will be on standby mode.
Next, the alarm will sound for 2
minutes, and the UPS will shut down.
BACK-UP MODE OVERLOAD
Load around 105% of it's rated
capacity
YELLOW/RED
After continuous alarm for 3 seconds,
the UPS will be on standby mode.
Next, the alarm will sound for 2
minutes, and the UPS will shut down.
Load > 120% of it's rated
capacity
YELLOW/RED
After continuous alarm for 3 seconds,
the UPS will be on standby mode.
Next, the alarm will sound for 2
minutes, and the UPS will shut down.
LOW BATTERY YELLOW
During back-up mode when the
battery charge runs low, the UPS
beeps rapidly (ON 0.25 seconds, OFF
0.25 seconds) until the UPS shuts
down or returns to AC Mode.
GREEN MODE ENABLED
If load < 60W or approximately
2% ~ 4% of the Wattage
capacity of the UPS Unit will
shutdown
Flashing GREEN LED, every
5 seconds
Alarm sounds every 30 seconds after
UPS enters idle mode.
Table 2: Diagnostics LED/Alarms
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