Slip Compensation; Slip Compensation Time Constant; Resonance Dampening; Resonance Dampening Time Constant - Danfoss VLT Programming Manual

®
VLT HVAC Drive Programming Guide

1-62 Slip Compensation

Range:
0 %* [-500 - 500 %]

1-63 Slip Compensation Time Constant

Range:
Application [0.05 - 5.00 s]
dependent*

1-64 Resonance Dampening

Range:
100 %* [0 - 500 %]

1-65 Resonance Dampening Time Constant

Range:
5 ms* [5 - 50 ms]
3.3.6 1-7* Start Adjustments
Parameters for setting special motor start features.
1-71 Start Delay
Range:
0.0 s* [0.0 - 120.0 s]
1-73 Flying Start
Option:
[0] * Disabled
[1] Enabled
3.3.7 1-8* Stop Adjustments
Parameters for setting special stop features for the motor.
Function:
Enter the % value for slip compensation, to compensate for tolerances in the value of n
compensation is calculated automatically, i.e. on the basis of the rated motor speed n
Function:
Enter the slip compensation reaction speed. A high value results in slow reaction, and a low value
results in quick reaction. If low-frequency resonance problems arise, use a longer time setting.
Function:
Enter the resonance dampening value. Set par. 1-64
nance Dampening Time Constant
to help eliminate high-frequency resonance problems. To reduce
resonance oscillation, increase the value of par. 1-64
Function:
Set par. 1-64 Resonance Dampening
eliminate high-frequency resonance problems. Enter the time constant that provides the best damp-
ening.
Function:
Function at Stop
The function selected in par. 1-80
Enter the time delay required before commencing acceleration.
Function:
This function makes it possible to catch a motor which is spinning freely due to a mains drop-out.
Flying Start
When par. 1-73 is enabled, par. 1-71
Search direction for flying start is linked to the setting in par. 4-10
Clockwise
[0]: Flying start search in clockwise direction. If not successful, a DC brake is carried out.
Both Directions
[2]: The flying start will first make a search in the direction determined by the last
reference (direction). If not finding the speed it will make a search in the other direction. If not
successful, a DC brake will be activated in the time set in par. 2-02
take place from 0 Hz.
Disable
Select [0] if this function is not required
Enable
Select [1] to enable the frequency converter to "catch" and control a spinning motor.
MG.11.C9.02 - VLT ® is a registered Danfoss trademark
3 Parameter Description
Resonance Dampening
Resonance Dampening
and par. 1-65 Resonance Dampening Time Constant
is active in the delay period.
Start Delay
has no function.
Motor Speed Direction
DC Braking Time
. Slip
M,N
.
M,N
3
and par. 1-65 Reso-
.
to help
.
. Start will then
55