1-61 High Speed Load Compensation
Range:
Function:
100 %
*
[0 - 300
%]
Enter the % value to compensate voltage in
relation to load when the motor is running
at high speed and obtain the optimum U/f
characteristic. The motor size determines the
frequency range within which this parameter
is active.
Motor size [kW]
Change-over [Hz]
0.25-7.5
> 10
11-45
< 5
55-550
< 3-4
Table 3.8
NOTE
1-61 High Speed Load Compensation
will not have effect
when
= [1] PM, non salient SPM.
1-62 Slip Compensation
Range:
Function:
0 %
*
[-500 - 500
%]
Enter the % value for slip compensation, to
compensate for tolerances in the value of
n
M,N
. Slip compensation is calculated
automatically, i.e. on the basis of the rated
motor speed n
M,N
.
NOTE
will not have effect when
= [1] PM, non salient SPM.
1-63 Slip Compensation Time Constant
Range:
Function:
Size related
*
[0.05 - 5 s] 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.
NOTE
1-63 Slip Compensation Time Constant
will not have effect
when
= [1] PM, non salient SPM.
1-64 Resonance Dampening
Range:
Function:
100 %
*
[0 - 500
%]
Enter the resonance dampening value. Set
and
1-65 Resonance Dampening Time Constant
to
help eliminate high-frequency resonance
problems. To reduce resonance oscillation,
increase the value of
.
NOTE
will not have effect when
= [1] PM, non salient SPM.
1-65 Resonance Dampening Time Constant
Range:
Function:
5 ms
*
[5 - 50 ms] Set
and
1-65 Resonance Dampening Time Constant
to
help eliminate high-frequency resonance
problems. Enter the time constant that
provides the best dampening.
NOTE
1-65 Resonance Dampening Time Constant
will not have
effect when
= [1] PM, non salient
SPM.
1-66 Min. Current at Low Speed
Range:
Function:
Size related
*
[ 1 - 200
%]
Enter the minimum motor current at
low speed.
Increasing this current improves
developed motor torque at low speed.
Low speed is here defined as speeds
below 6% of the Nominal Speed of
Motor (
) in
VVC
plus
PM Control
NOTE
1-66 will not have affect if 1-10 =[0]
3.3.8 1-7* Start Adjustments
1-70 PM Start Mode
Option:
Function:
[0] Rotor
Detection
Suitable for all applications where the motor
is known to be standing still when starting
(e.g. conveyors, pumps and non wind milling
fans).
[1] Parking
If the motor turns at a slight speed (i.e. lower
than 2-5% of the nominal speed) e.g. due to
fans with light wind milling, select
[1] Parking
and adjust
and
accordingly.
1-71 Start Delay
Range:
Function:
0 s
*
[0.0 -
120.0 s]
This parameter refers to the start function
selected in
.
Enter the time delay required before commencing
acceleration.
The parameter is also used for delayed start of
compressor functionality in Injection Control.
Parameter Description
VLT
®
Refrigeration Drive Programming Guide
MG16H102 - VLT
®
is a registered Danfoss trademark
43
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