![background image](http://html1.mh-extra.com/html/danfoss/vlt-automationdrive-fc-303/vlt-automationdrive-fc-303_instruction-manual_3731801074.webp)
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 to 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 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.
Basic Troubleshooting
VLT
®
AutomationDrive Instruction
Manual
MG.33.AI.22 - VLT
®
is a registered Danfoss trademark
9-3
9
9
Содержание VLT AutomationDrive FC 303
Страница 1: ...MAKING MODERN LIVING POSSIBLE Instruction Manual VLT AutomationDrive FC 300...
Страница 3: ...Safety VLT AutomationDrive Instruction Manual MG 33 AI 22 VLT is a registered Danfoss trademark...
Страница 7: ...Contents VLT AutomationDrive Instruction Manual MG 33 AI 22 VLT is a registered Danfoss trademark...
Страница 13: ...Introduction VLT AutomationDrive Instruction Manual 1 6 MG 33 AI 22 VLT is a registered Danfoss trademark 1 1...
Страница 29: ...Installation VLT AutomationDrive Instruction Manual 2 16 MG 33 AI 22 VLT is a registered Danfoss trademark 2 2...
Страница 101: ...Specifications VLT AutomationDrive Instruction Manual 10 26 MG 33 AI 22 VLT is a registered Danfoss trademark 10 10...
Страница 105: ...www danfoss com drives MG33AI22 130R0300 MG33AI22 Rev 2011 05 13...