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No.
Alarm Message
18
PWR UNIT #n
INV OVER HEAT
SHUTDOWN
19
PFC SCR FAULT
20
PWR UNIT #n DC
BUS NOK
21
PWR UNIT #n INV
OUTPUT NOK
SHUTDOWN
22
UPS OUTPUT
FAULT
SHUTDOWN
23
INV OVER
CURRENT
24
PWR UNIT #n INV
SHORT CIRCUIT
SHUTDOWN
25
PWR UNIT #n
INV STS FAIL
SHUTDOWN
26
BYPASS STS
OVER HEAT
27
BYPASS INPUT
VOLT OR FREQ
NOK
Ultron DPS Series
Possible Cause
1. Fans have abnormalities.
2. Foreign matter is stuck in
the fans.
1. PFC SCR is damaged.
2. Driving circuit is damaged.
DC BUS voltage is too high or
too low.
Inverter's output voltage is too
high or too low.
Inverter's output voltage is too
high or too low.
Output might have shorting
issues.
Output might have shorting
issues.
1. Inverter's static switch is
damaged.
2. Inverter's driving circuit is
damaged.
1. Fans have abnormalities.
2. Foreign matter is stuck in
the fans.
3. The UPS is overloaded.
1. The Bypass Switch (Q2) is
turned off.
2. Bypass voltage or
frequency is abnormal.
11- 4
Solution
Check if fans work abnormally or
foreign matter is blocking a fan. If
yes, contact service personnel. If not,
please decrease some critical loads.
Contact service personnel.
Contact service personnel.
Contact service personnel.
Contact service personnel.
Contact service personnel.
Contact service personnel.
Contact service personnel.
Check if fans work abnormally or
foreign matter is blocking a fan. If
yes, contact service personnel. If not,
please decrease critical loads.
1. Check if the Bypass Switch (Q2) is
turned off. If yes, turn it on.
2. If the Bypass Switch (Q2) is turned
on but the alarm still exists, contact
service personnel.
3. Check if bypass voltage or
frequency is abnormal. If yes,
please wait until bypass AC source
becomes normal.
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