Delta DPS-400K - Page 141

11-5
11
Troubleshooting
No. Alarm Message Possible Cause Solution
28 BYPASS INPUT
PHASE SEQ NOK
Wrong wiring. Check if the bypass AC source’s wiring
and phase sequence are correct. If
not, contact service personnel.
29 BYPASS STS
OVER CURRENT
The UPS is overloaded. Decrease some critical loads.
30 BYPASS STS FAIL 1.
Bypass static switch is
damaged.
2. Bypass driving circuit is
damaged.
Contact service personnel.
31 EMERGENCY
POWER OFF
Emergent shutdown is
executed.
Shut down the UPS. After emergency
events are eliminated, follow turn-on
procedures to start up the UPS.
32 PWR UNIT #n
COMMUNICATION
NOK
1.
Internal communication
ca
EOHLVQRW¿UPO\
connected.
2. Communication circuit is
abnormal.
Contact service personnel.
33 EXT PARALLEL
COMMUNICATION
NOK
3DUDOOHOFDEOHLVQRW¿UPO\
connected.
&KHFNLISDUDOOHOFDEOHLV¿UPO\
connected or not. If not, connect it
¿UPO\
34 PARALLEL FAIL 1. Parallel UPSs are not
compatible.
2.
7KHUHDUHFRQÀLFWVEH tween
parallel UPSs’ IDs.
 &KHFNLIWKHUHDUHFRQÀLFWVEHWZHHQ
parallel UPSs’ IDs. If yes, contact
service personnel.
2. Check if parallel UPSs are
compatible or not. If not, contact
service personnel.
35 ON MANUAL
BYPASS
The Manual Bypass Switch
(Q3) is turned on.
1. Check if the Manual Bypass Switch
(Q3) is turned on. If yes, turn it off.
2. If the Manual Bypass Switch (Q3)
is turned off and the alarm still
exists, contact service personnel.
36 REDUNDANCY
LOSS
Overload causes redundancy
failure.
Decrease critical loads and reset
redundancy.