Delta Electronics VFD-M Series, User Manual

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Chapter 6 Fault Code Information and Maintenance
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Revision May 2008, ME14, SW V3.04 6-3
Fault Name Fault Descriptions Corrective Actions
Over-current during steady state
operation:
1. Short-circuit at motor output.
2. Sudden increase in motor
loading.
3. AC drive output capacity is
too small.
1. Check for possible poor insulation at the
output line.
2. Check for possible motor stall.
3. Replace with the AC drive with one that
has a higher output capacity (next HP
size).
Internal memory IC can not be
programmed.
1. Switch off power supply.
2. Check whether the input voltage falls
within the rated AC drive input voltage.
3. Switch the AC drive back on.
Internal memory IC can not be
read.
1. Check the connections between the
main control board and the power
board.
2. Reset drive to factory defaults.
The external terminal EF-GND
goes from OFF to ON.
When external terminal EF-GND is closed,
the output will be turned off (under N.O.
E.F.).
Auto accel/decel failure
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
Please refer to Pr.92.
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 (base-
block) is active, the AC drive output will
be turned off.
2. Disable this connection and the AC
drive will begin to work again.