Danfoss VLT FC 302 User Manual

Symptom Possible cause Test Solution
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* Speed Bypass
Check if noise and/or vibration
have been reduced to an
acceptable limit
Turn off over-modulation in
14-03 Overmodulation
Change switching pattern and
frequency in parameter group
14-0* Inverter Switching
Increase Resonance Dampening in
1-64 Resonance Dampening
Table 10.1 Troubleshooting
Basic Start-up Troubleshoot... Operating Instructions
138 Danfoss A/S © Rev. 2014-07-29 All rights reserved. MG37A202
1010

Danfoss VLT FC 302 Specifications

General

Brake Function	Built-in brake chopper in all units up to 22 kW
Output Voltage Range	0-100% of input voltage
Power Range	0.37 kW
Control Modes	VVCplus, Flux, U/f
Protection Features	Overvoltage, undervoltage, overcurrent, short circuit, overtemperature, overload
Communication Options	Modbus RTU, BACnet, Ethernet/IP, Profinet, Profibus, CANopen, DeviceNet
Ambient Temperature Range	-10°C to +50°C (derating above +40°C)
Enclosure Rating	IP20, IP21, IP55
Cooling Method	Air-cooled
Input Voltage	200-240V, 380-480V, 525-600V