Danfoss FC 300 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 to 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 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 frequency converter
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 Operating
Instructions
MG33AM02 - VLT
®
is a registered Danfoss trademark 63
9
9

Danfoss FC 300 Specifications

General

Enclosure	IP20
Approvals	cUL, UL, CE
EMC filter	Built-in
Communication Options	CANopen, PROFIBUS DP
Protection Features	Overcurrent, Overvoltage, Undervoltage, Overtemperature, Short Circuit
Output Voltage	0-100% of supply voltage