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Table 3 Troubleshooting guide
Fault
classification
LED
display
Audible
alarm Condition
Response
time
Bus
fault
C & F
LEDs
Continuous
± Bus V > 450 VDC 80 ms
± Bus V > 410 VDC 1.5 seconds
± Bus V < 230 VDC 80 ms
|(Abnormal + Bus V)-(|-Bus V |)| > 40 VDC or
|(+Bus V)-(Abnormal |-Bus V|)| > 35 VDC
2 minutes
Inverter
fault
B & F
LEDs
Continuous
Inverter output power > 276 VAC or
Inverter output power < 140 VAC
Minimum
90 ms
Inverter output power short. UPS short circuit
fault.
5 cycles
Overtemp
fault
A & F
LEDs
Continuous
If temperature is > 90°F (32°C) detected
NTC’s temperature on CNTL pcb.
5 seconds
If temperature > 65°F (18°C) and < 90°F
(32°C), then transfer to bypass mode, and
wait until temperature < 40°F (5°C) then back
to inverter mode
4.5 seconds
Battery
overvoltage fault
D & F
LEDs
Continuous Battery voltage > 15V per unit 6.4 seconds
Battery mode
overload alarm
E & F
LEDs
0.5 second
beep, recurring
every 1 second
Battery mode load > 105%, < 125% 1 minute
Battery mode load > 125%, < 150% 10 seconds
Battery mode load > 150% Instantaneous
Bypass
fault
A, B & F
LEDs
Continuous
Try to turn unit on (inverter mode). Check
output load for shorts.
Instantaneous
Relay bonded
on N.O.
A, C & F
LEDs
Continuous
Check inverter output voltage, before inverter
soft start. If detected inverter output voltage
> 85 VAC, then set fault.
Instantaneous
Inverter mode
output power
short circuit
fault
A, D & F
LEDs
Continuous
If detected inverter output power I > 70 ADC
and output voltage < 90 VDC, then increase
{short_cnt}.
If {short_cnt} > 30 any time in period of
96 ms, then set UPS short circuit fault.
Not specified
Line LED
flash warning
——
Line voltage > 276 VAC 48 ms
Line voltage < 170 VAC
160 ms or
(48 ms)
Battery
disconnected
warning
BAT LED
flashing
0.5 second
beep, recurring
every 1 second
When UPS turn off charger and detected
battery voltage < 10 VDC per unit
Instantaneous
Battery fail
warning
BAT LED
flashing
Continuous
When the UPS is in battery test sequence
and detected battery voltage < 10 VDC per
unit
Instantaneous
Bypass mode
bus overvoltage
or input voltage
too high fault
All LEDs bright,
buzzer beeping
Continuous
Bus overvoltage > 400 VDC or
input voltage > 292 VAC
Not specified
Input voltage
> 292 VAC
All LEDs bright,
buzzer beeping
Continuous
Check input voltage—must be greater than
292 VAC.
Not specified
BUS voltage
fault
All LEDs bright,
buzzer beeping
Continuous
Check the BUS voltage—must be lower than
242 VDC.
Not specified