Xtreme Power Conversion Corporation
E90 Service Manual
Page 64
Uninterruptible Power Supply
Appendix A: UPS fault judgment
No.
UPS Alarm
Software judgment
Buzz
LED
Condition 1
Condition 2
Condition 3
Condition 4
1
Rectifier fault
DC BUS over-
voltage
DC BUS under-
voltage
Large bus
difference
long
beep
Fault
ON
2
Inv.
fault(include Inv.
Bridge arm )
The absolute value of the output
voltage >112.5% of rated output
voltage, last 500ms
Bridge arm midpoint voltage( Inv.
voltage) last 500ms >1.1 time of rat-
ed peak value 360vfor230 344for220
376for240
long
beep
Fault
ON
3
Inv. SCR short
long
beep
Fault
ON
4
Inv. SCR break
(in parallel, X phase load rate<6.3%) &&(parallel X phase total load
rate>50%) &&(large loop current||in bypass mode) last time 2S
long
beep
Fault
ON
5
Bypass SCR
short
(X phase Output voltage>60% of rated) &&(the absolute values of other
phases voltage<5% of rated voltage) last 2s
long
beep
Fault
ON
6
Bypass SCR
break
((in parallel, X phase load rate <6.3%) &&(parallel X phase total load
rate<50%) &&(large loop current|| in Bypass mode) ) ||(X phase cur-
rent>10% of rated&&X phase Output voltage>50% of the Bypass voltage)
last 2S
long
beep
Fault
ON
7
Fuse broken
Hardware signal low available
long
beep
Fault
ON
8
Parallel Relay
fault
( Inv. status&&Relay open) ||(no Inv. Status && parallel Relay close) last
20ms
long
beep
Fault
ON
9
Fan fault
Hardware signal
low available
for 5s
long
beep
Fault
ON
10
Reserve
long
beep
Fault
ON
11
Auxiliary power
fault
Hardware signal
low available for
3ms
long
beep
Fault
ON
12
Power initializa-
tion fault
1) Rec.DSP read IIC self-test, until 15s power on) Inv. DSP read IIC self-
test, until 15s delay unit not obtain valid parameter from E2PROM,
jumper error, jumper type is not defined, DSP internal RAM self-test
error(MCU cannot completely modify RAM)
long
beep
Fault
ON
13
Positive bat-
tery Charge
fault
long
beep
Fault
ON
14
Negative bat-
tery Charge
fault
long
beep
Fault
ON
15
Bus over-volt-
age
+bus
voltage>470V
Last time:
20ms
-bus voltage
>470V
Last time:
20ms
long
beep
Fault
ON
16
Bus under-
voltage
Bus volt
-
age <280V
time:120ms
Bus voltage is 10V lower
than setting value
Time: 2min
long
beep
Fault
ON
