Danfoss VLT AQUA Drive FC 202 Operating Manual page 131

Operating Guide | VLT® AQUA Drive FC 202
Symptom Possible cause
Open power Phase-to-phase short.
fuses
Motor overload.
Loose connections.
Mains current Problem with mains power
imbalance (see Alarm 4, Mains phase loss
greater than 3% description).
Problem with the AC drive.
Motor current Problem with motor or motor
imbalance wiring.
greater than 3%
Problem with AC drive.
AC drive accel- Motor data are entered incor-
eration prob- rectly.
lems
AC drive decel- Motor data are entered incor-
eration prob- rectly.
lems
Danfoss A/S © 2020.01
Test
Motor or panel has a short phase-
to-phase. Check motor and panel
phases for shorts.
Motor is overloaded for the appli-
cation.
Perform pre-start-up check for
loose connections.
Rotate input power leads into the
1 position: A to B, B to C, C to A.
Rotate input power leads into the
AC drive 1 position: A to B, B to C, C
to A.
Rotate output motor cables 1 posi-
tion: U to V, V to W, W to U.
Rotate output motor cables 1 posi-
tion: U to V, V to W, W to U.
If warnings or alarms occur, refer
to the Warnings and Alarms sec-
tion. Check that motor data are en-
tered correctly.
If warnings or alarms occur, refer
to the Warnings and Alarms sec-
tion. Check that motor data are en-
tered correctly.
Maintenance, Diagnostics, and
Troubleshooting
Solution
Eliminate any shorts detected.
Perform start-up test and verify that
motor current is within specifications. If
motor current is exceeding the name-
plate full load current, the motor can
run only with reduced load. Review the
specifications for the application.
Tighten loose connections.
If imbalanced leg follows the wire, it is a
power problem. Check the mains sup-
ply.
If the imbalanced leg stays on same in-
put terminal, it is a problem with the AC
drive. Contact the supplier.
If the imbalanced leg follows the wire,
the problem is in the motor or motor
wiring. Check motor and motor wiring.
If the imbalanced leg stays on same
output terminal, it is a problem with
the unit. Contact the supplier.
Increase the ramp-up time in parameter
3-41 Ramp 1 Ramp Up Time. Increase
current limit in parameter 4-18 Current
Limit. Increase torque limit in parameter
4-16 Torque Limit Motor Mode.
Increase the ramp-down time in param-
eter 3-42 Ramp 1 Ramp Down Time. Ena-
ble overvoltage control in parameter
2-17 Over-voltage Control.
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