Delta Electronics VFD-EL series, User Manual, Page: 146 / 181

Chapter 6 Fault Code Information and Maintenance
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Revision 2016/03, 6ELE, V1.14
6-3
Fault
Name
Fault Descriptions Corrective Actions
Ground fault
When (one of) the output terminal(s) is grounded, short
circuit current is more than 50% of AC motor drive rated
current, the AC motor drive power module may be
damaged.
NOTE: The short circuit protection is provided for AC
motor drive protection, not for protection of the user.
1. Check whether the IGBT power module is damaged.
2. Check for possible poor insulation at the output line.
Auto accel/decel failure
1. Check if the motor is suitable for operation by AC motor
drive.
2. Check if the regenerative energy is too large.
3. Load may have changed suddenly.
Communication Error
1. Check the RS485 connection between the AC motor
drive and RS485 master for loose wires and wiring to
correct pins.
2. Check if the communication protocol, address,
transmission speed, etc. are properly set.
3. Use the correct checksum calculation.
4. Please refer to group 9 in the chapter 5 for detail
information.
Software protection failure Return to the factory.
Analog signal error Check the wiring of ACI
PID feedback signal error
1. Check parameter settings (Pr.10.01) and AVI/ACI wiring.
2. Check for possible fault between system response time
and the PID feedback signal detection time (Pr.10.08)
Phase Loss Check input phase wiring for loose contacts.
Unusual PID feedback
Check if wiring of PID feedback is correct and parameter of
PID feedback is properly setup.