Danfoss VLT FC Series Operating Instructions Manual page 62

Start Up Troubleshooting
Symptom
Repeated
fuse or circuit
breaker fault.
Open control
fuse
8 8
Open SMPS
fuse
Motor
rotation
incorrect
Table 8.4 Fault Table
60
Possible cause
Application problem
Panel problem
Power problem
Motor problem
Improper voltage applied
Customer wires incorrectly terminated
Control ground fault
Control short
Improper voltage applied
Customer wires incorrectly terminated
Control ground fault
Control short
Rotation incorrect in bypass, drive or
both
MG14I102 - VLT
Option Panel Operating Instructions
Test
Perform startup procedures. Check
panel output motor current at full
speed and check for excessive over
current.
Perform startup procedures. Check
panel input current at full load and
verify it is within acceptable range.
Monitor incoming power for surges,
sags and overall quality.
Test motor for correct function.
See pre-startup check list.
See the customer connection drawing
and make sure the wires are connected
to the correct terminals.
Check all control wires for a short to
ground.
Check control wires for a short in
supply voltage.
See pre-startup check list.
See the customer connection drawing
and make sure the wires are connected
to the correct terminals.
Check all control wires for a short to
ground.
Check control wires for a short in
supply voltage.
Motor rotation is backwards in drive
mode, bypass mode, or both.
®
is a registered Danfoss trademark
Solution
If current is too high, reduce the load
on the motor.
If current is too high, reduce the load
on the motor.
Correct any problems found.
Repair or replace motor if a problem is
found.
Correct voltage mismatch. This could
potentially damage the panel. Use
caution when applying power.
Correct any wrong connections. This
could potentially cause damage to the
panel.
Correct any ground faults found. This
could potentially cause damage to the
panel.
Correct any shorts. This could
potentially cause damage to the panel.
Correct voltage mismatch. This could
potentially damage the panel. Use
caution when applying power.
Correct any wrong connections. This
could potentially cause damage to the
panel.
Correct any ground faults found. This
could potentially cause damage to the
panel.
Correct any shorts. This could
potentially cause damage to the panel.
Perform motor rotation procedure in
4 Start Up.