Delta Modulon DPH Series User Manual page 210

When you see the following alarm messages appear on the LCD, please follow the solutions shown
below. If you see other alarm messages that are not listed in the table below, please contact Delta
service personnel for assistance. Do not perform troubleshooting if you are not trained for it.
No. Alarm Message
Mains Input Volt/
1
Freq Out Range
Mains Input
2 Volt Phase Seq
Abnormal
Mains Input
3
Bypass Input Volt
4
Out Range
Modulon DPH Series
Possible Cause
1. The Input/ Bypass
Breaker (Q1) is turned
2. The main AC source's
voltage or frequency
is abnormal.
The wiring is incorrect.
The Input/ Bypass
Breaker (Q1) is turned
1. The Input/ Bypass
Breaker (Q1) is turned
2. The bypass AC
source's voltage is
abnormal.
10-2
Solution
1. Please check if the Input/ Bypass
yes, please turn it on.
2. Please check if the main AC source's
voltage or frequency is abnormal or
not. If yes, please wait for the main AC
source to be restored.
3. If the alarm message still exists after
the solutions mentioned above have
been executed, please contact service
personnel.
Please check the wiring and phase
sequence of the main AC source, and
contact service personnel for assistance.
1. Please check if the Input/ Bypass
yes, please turn it on.
2. If the alarm message still exists after
the solution mentioned above has
been executed, please contact service
personnel.
1. Please check if the Input/ Bypass
yes, please turn it on.
2. Please check if the bypass AC
source's voltage is abnormal or not.
If yes, please wait for the bypass AC
source to be restored.
3. If the alarm message still exists after
the solutions mentioned above have
been executed, please contact service
personnel.