Description Of Parameters - Danfoss VLT 5000 Operating Instructions Manual

Description of parameters

No. Parameter
701 Operating mode
POSITIONING
MODE
702 Proportional gain
PROP. GAIN
703 Derivative gain
DER. GAIN
704 Integral gain
INT. GAIN
705 Limit integral part
INT. LIMIT
MG.50.P3.02 - VLT is a registered Danfoss trademark
Positioning Controller
Default Range
value
1 1 = POSITIONING This parameter never needs changing.
30 1 ... 65,000
0 0 ... 65,000
0 0 ... 65,000
1,000 0 ... 65,000
Description
The proportional gain is the factor that is
multiplied with the PID tracking error to
produce the proportional part of the output
frequency.
The higher the setting of this parameter
the "harder" is the resulting control.
NB! Too high a setting of this parameter
will cause the controller to become
unstable.
The derivative gain is the factor that is
multiplied with the change in the PID
tracking error to produce the derivative
part of the output frequency.
The higher the setting of this parameter
the "harder" is the resulting control.
The derivative gain has best effect if the
encoder is mounted directly on the motor
and an encoder with good resolution
(4096 pulses/rev) is used.
NB! Too high a setting of this parameter
will cause the controller to become
unstable.
The integral gain is the factor that is multi-
plied with the integrated PID tracking error
to produce the integral part of the output
frequency. The main function of the inte-
gral part is to provide zero steady-state
tracking error.
The higher the setting, the faster the
application will reach a zero steady-state
tracking error. The dynamic tracking error
however increases with increasing setting
of this parameter.
NB! Too high a setting of this parameter
will cause the controller to become
unstable.
Here it is possible to clamp the integral
part of the PID output. A setting of 1000
corresponds to 100% of the maximum
allowed reference specified in parameter
205.
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