User manual

Chapter 7 Troubleshooting and Fault Information
© 1999 DELTA ELECTRONICS, INC. ALL RIGHTS RESERVE
103
Fault
Name
Fault Descriptions Corrective Actions
Auto accel/decel failure
1. Don’t use the function of auto acceleration
/deceleration.
Ground fault :
The AC drive output is
abnormal. When the
output terminal is
grounded (short circuit
current is 50% more than
the AC drive rated
current), the AC drive
power module may be
damaged. The short
circuit protection is
provided for AC drive
protection, not user
protection.
Ground fault :
1. Check whether the IGBT power module is damaged.
2. Check for possible poor insulation at the output line.
Communication Error
1. Check the connection between the AC drive and
computer for loose wires.
2. Check if the communication protocol is properly set.
External Base Block.
AC drive output is turned
off.
1. When the external input terminal (B.B) is active, the AC
drive output will be turned off.
2. Disable this connection and the AC drive will begin to
work again.