Danfoss VLTAutomationDrive FC 360 User Manual

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 startup 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.
Mains current imbalance
greater than 3%
Problem with mains power (See
Alarm 4 Mains 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 mains
power supply.
Problem with the frequency
converter unit
Rotate input power leads into the
frequency converter 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 the 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 the 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 the supplier.
Acoustic noise or vibration
(e.g. a fan blade is making
noise or vibrations at
certain frequencies)
Resonances, e.g. in the motor/fan
system
Bypass critical frequencies by using
parameters in parameter group
4-6*.
Check if noise and/or vibration
have been reduced to an
acceptable limit.
Turn off over-modulation in 14-03.
Change switching pattern and
frequency in parameter group
14-0*.
Increase Resonance Dampening in
1-64.
Table 7.1
Basic Troubleshooting and F...
VLT
®
AutomationDrive FC 360 Quick Guide
MG06A102 - VLT
®
is a registered Danfoss trademark 35
7 7

Danfoss VLTAutomationDrive FC 360 Specifications

General

Brand	Danfoss
Model	VLTAutomationDrive FC 360
Category	Controller
Language	English