Delta Modulon DPH Series User Manual page 232

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.
Alarm
No.
Message
Mains Input
Volt/ Freq
1
Out Range
Mains Input
Volt Phase
2
Seq Abnormal
Mains Input
3
Bypass Input
4
Volt Out Range
Modulon DPH Series
Possible Cause
1. The input switch is turned
off.
2. The main AC source's
voltage or frequency is
abnormal.
The wiring is incorrect.
1. The bypass switch is
turned off.
2. The bypass AC source's
voltage is abnormal.
1. Please check if the input switch is
turned off or not. If 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 switch is
turned off or not. If 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 bypass switch is
turned off or not. If 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.
10-2
Solution