System Start Up; Acoustic Noise Or Vibration - Danfoss VLT HVAC Operating Instructions Manual

Start Up and Functional Tes...
If acceleration problems were encountered
•
If warnings or alarms occur, see 8 Warnings and
Alarms.
•
Check that motor data is entered correctly.
•
Increase the ramp-up time in 3-41 Ramp 1 Ramp
Up Time.
•
Increase current limit in 4-18 Current Limit.
•
Increase torque limit in 4-16 Torque Limit Motor
Mode.
If deceleration problems were encountered
•
If warnings or alarms occur, see 8 Warnings and
Alarms.
•
Check that motor data is entered correctly.
•
Increase the ramp-down time in 3-42 Ramp 1
Ramp Down Time.
•
Enable overvoltage control in 2-17 Over-voltage
Control.
NOTE
The OVC algorithm does not work when using PM motors.
See 8.4 Warning and Alarm Definitions for resetting the
frequency converter after a trip.
NOTE
3.1 Pre-start through 3.7 Local-control Test in this chapter
concludes the procedures for applying power to the
frequency converter, basic programming, set-up, and
functional testing.

3.8 System Start Up

The procedure in this section requires user-wiring and
application programming to be completed. 6 Application
Set-Up Examples is intended to help with this task. Other
aids to application set-up are listed in 1.2 Additional
Resources. The following procedure is recommended after
application set-up by the user is completed.
CAUTION
MOTOR START!
Ensure that the motor, system, and any attached
equipment is ready for start. It is the responsibility of the
user to ensure safe operation under any condition. Failure
to do so could result in personal injury or equipment
damage.
®
VLT HVAC Drive Operating Instructions
If warnings or alarms occur, see 8 Warnings and Alarms.

3.9 Acoustic Noise or Vibration

If the motor or the equipment driven by the motor - e.g. a
fan blade - is making noise or vibrations at certain
frequencies, try the following:
®
MG11AH02 - VLT is a registered Danfoss trademark
1. Press [Auto On].
2. Ensure that external control functions are
properly wired to the frequency converter and all
programming is completed.
3. Apply an external run command.
4. Adjust the speed reference throughout the speed
range.
5. Remove the external run command.
6. Note any problems.
•
Speed Bypass, parameter group 4-6*
•
Over-modulation, 14-03 Overmodulation set to off
•
Switching pattern and switching frequency
parameter group 14-0*
•
Resonance Dampening, 1-64 Resonance
Dampening
3 3
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