Danfoss FC 300 Programming Manual page 41

Parameter Descriptions
1-62 Slip Compensation
Range: Function:
Applica- [-500 - Enter the % value for slip compensation, to
tion 500 %] compensate for tolerances in the value of
depend- n . Slip compensation is calculated
M,N
ent automatically, i.e. on the basis of the rated
*
motor speed n
This function is not active when
par. 1-00 Configuration Mode is set to Speed
closed loop [1] or Torque [2] Torque control
with speed feedback or when par. 1-01 Motor
Control Principle is set to U/f [0] special motor
mode.
1-63 Slip Compensation Time Constant
Range: Function:
Application [0.05 - 5.00 Enter the slip compensation reaction
dependent s] 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.
1-64 Resonance Dampening
Range: Function:
100 % [0 - 500 Enter the resonance dampening value. Set
*
%] par. 1-64 Resonance Dampening and
par. 1-65 Resonance Dampening Time Constant
to help eliminate high-frequency resonance
problems. To reduce resonance oscillation,
increase the value of par. 1-64 Resonance
Dampening.
1-65 Resonance Dampening Time Constant
Range: Function:
5 ms [5 - 50 ms] Set par. 1-64 Resonance Dampening and
*
par. 1-65 Resonance Dampening Time Constant
to help eliminate high-frequency resonance
problems. Enter the time constant that
provides the best dampening.
1-66 Min. Current at Low Speed
Range: Function:
100 [Applica- Enter the minimum motor current at low
% tion speed, see par. 1-53 Model Shift Frequency.
*
Increasing this current improves motor torque
at low speed.
Par. 1-66 Min. Current at Low Speed is enabled
when par. 1-00 Configuration Mode = Speed
open loop [0] only. The frequency converter
runs with constant current through motor for
speeds below 10 Hz.
For speeds above 10 Hz, the motor flux model
in the frequency converter controls the motor.
par. 4-16 Torque Limit Motor Mode and / or
FC 300 Programming Guide
.
M,N
®
MG.33.M9.02 - VLT is a registered Danfoss trademark
1-66 Min. Current at Low Speed
Range: Function:
depend- par. 4-17 Torque Limit Generator Mode automat-
ant] ically adjust par. 1-66 Min. Current at Low Speed.
The parameter with the highest value adjusts
par. 1-66 Min. Current at Low Speed. The current
setting in par. 1-66 Min. Current at Low Speed is
composed of the torque generating current
and the magnetizing current.
Example: Set par. 4-16 Torque Limit Motor Mode
to 100% and set par. 4-17 Torque Limit Genera-
tor Mode to 60%. par. 1-66 Min. Current at Low
Speed automatically adjusts to about 127%,
depending on the motor size.
This parameter is available for FC 302 only.
1-67 Load Type
Option: Function:
[0] Passive load For conveyers, fan and pump applications.
*
[1] Active load For hoisting applications, used in slip compen-
sation at low speed. When Active Load [1] is
selected, set par. 1-66 Min. Current at Low Speed
to a level which corresponds to maximum
torque.
This parameter is available for FC 302 only.
1-68 Minimum Inertia
Range: Function:
Applica- [Applica- Needed for average inertia calculation.
tion tion Enter the minimum moment of inertia of
depend- depend- the mechanical system.
ent ant] Par. 1-68 Minimum Inertia and
*
par. 1-69 Maximum Inertia are used for
pre-adjustment of the Proportional Gain
in the speed control, see par. 30-83 Speed
PID Proportional Gain.
This parameter is available for FC 302
only.
This parameter cannot be adjusted while motor is running.
1-69 Maximum Inertia
Range: Function:
Application [Application Active in Flux Open Loop only. Used
dependent dependant] to compute the acceleration torque
*
at low speed. Used in the torque
limit controller.
This parameter is available for FC
302 only.
This parameter cannot be adjusted while motor is running.
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