Symptom
Possible Cause
Test
Solution
Open power fuses or circuit
breaker trip
Phase to phase short
Motor or panel has a short phase
to phase. Check motor and panel
phase for shorts.
Eliminate any shorts detected.
Motor overload
Motor is overloaded for the
application.
Perform start-up test and verify
motor current is within specifi-
cations. If motor current is
exceeding nameplate full load
current, motor may run only with
reduced load. Review the specifi-
cations for the application.
Loose connections
Perform pre-startup check for loose
connections.
Tighten loose connections.
Line power current
imbalance greater than 3%
Problem with line power (See
Alarm 4 Line phase loss
description)
Rotate input power leads into the
drive one position: A to B, B to C, C
to A.
If imbalanced leg follows the wire,
it is a power problem. Check line
power supply.
Problem with the adjustable
frequency drive unit
Rotate input power leads into the
adjustable frequency drive one
position: A to B, B to C, C to A.
If imbalance leg stays on same
input terminal, it is a problem with
the unit. Contact supplier.
Motor current imbalance
greater than 3%
Problem with motor or motor
wiring
Rotate output motor leads one
position: U to V, V to W, W to U.
If imbalanced leg follows the wire,
the problem is in the motor or
motor wiring. Check motor and
motor wiring.
Problem with adjustable
frequency drive unit
Rotate output motor leads one
position: U to V, V to W, W to U.
If imbalance leg stays on same
output terminal, it is a problem
with the unit. Contact supplier.
Table 9.1 Troubleshooting
Basic Troubleshooting
VLT
®
AutomationDrive Instruction
Manual
MG33AM22 - VLT
®
is a registered Danfoss trademark
9-3
9
9
Содержание FC 300
Страница 1: ...MAKING MODERN LIVING POSSIBLE Instruction Manual VLT AutomationDrive FC 300 0 25 75 kW ...
Страница 2: ......
Страница 8: ...Contents VLT AutomationDrive Instruction Manual MG33AM22 VLT is a registered Danfoss trademark ...
Страница 14: ...Introduction VLT AutomationDrive Instruction Manual 1 6 MG33AM22 VLT is a registered Danfoss trademark 1 1 ...
Страница 62: ...Status Messages VLT AutomationDrive Instruction Manual 7 4 MG33AM22 VLT is a registered Danfoss trademark 7 7 ...
Страница 109: ...Index VLT AutomationDrive Instruction Manual MG33AM22 VLT is a registered Danfoss trademark 12 5 ...
Страница 110: ...www danfoss com drives MG33AM22 130R0300 MG33AM22 Rev 2013 03 12 ...