3.14.5 20-8* PI Basic Settings
Parameters for conguring the process PI control.
20-81 PI Normal/ Inverse Control
Option: Function:
[0] * Normal Causes the frequency converter output frequency
to decrease when the feedback is greater than the
setpoint reference. This behavior is common for
pressure-controlled supply fan and pump
applications.
[1] Inverse Causes the frequency converter output frequency
to increase when the feedback is greater than the
setpoint reference. This behavior is common for
temperature-controlled cooling applications, such
as cooling towers.
20-83 PI Start Speed [Hz]
Range: Function:
0 Hz* [ 0 -
200.0 Hz]
Enter the motor speed to be attained as a
start signal for commencement of PI control.
After power-up, the frequency converter
operates using speed open-loop control.
When the process PI start speed is reached,
the frequency converter changes to PI control.
20-84 On Reference Bandwidth
Range: Function:
5 %* [0 -
200 %]
When the dierence between the feedback and
the setpoint reference is less than the value of
this parameter, the frequency converter display
shows Run on Reference. This status can be
communicated externally by programming the
function of a digital output for [8] Run on
Reference/No Warning. In addition, for serial
communications, the on-reference status bit of
the frequency converter status word is high (1).
The on-reference bandwidth is calculated as a
percentage of the setpoint reference.
3.14.6 20-9* PI Controller
20-91 PI Anti Windup
Option: Function:
[0] O Continue regulation of an error even when the output
frequency cannot be increased or decreased.
[1] * On Cease regulation of an error when the output
frequency can no longer be adjusted.
20-93 PI Proportional Gain
Range: Function:
0.50* [0 - 10 ] Enter the process controller proportional gain.
Quick control is obtained at high amplication.
However, if amplication is too high, the
process may become unstable.
20-94 PI Integral Time
Range: Function:
20 s* [0.10 -
9999 s]
Enter the process controller integral time.
Obtain quick control through a short integral
time, though if the integral time is too short,
the process becomes unstable. An excessively
long integral time disables the integral action.
20-97 PI Feed Forward Factor
Range: Function:
0 %* [0 -
400 %]
Enter the PI feed forward factor. The FF factor
sends a constant fraction of the reference
signal to bypass PI control. Therefore, the PI
can aect only the remaining fraction of the
control signal. The FF factor can increase
dynamic performance.
Parameters Programming Guide
MG18B502 Danfoss A/S © 04/2018 All rights reserved. 87
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