Danfoss Metasys N2 Programming Guide

The proportional band (error causing output to change
from 0–100%) can be calculated with the formula
1
ProportionalGain
× MaxReference
21-22 Ext. 1 Integral Time
Range: Function:
10000
s*
[0.01 -
10000 s]
Over time, the integrator accumulates a
contribution to the output from the PID
controller as long as there is a deviation
between the reference/setpoint and
feedback signals. The contribution is propor-
tional to the size of the deviation. This
ensures that the deviation (error)
approaches zero.
Quick response on any deviation is obtained
when the integral time is set to a low value.
Setting it too low, however, may cause the
control to become unstable.
The value set is the time needed for the
integrator to add the same contribution as
the proportional for a certain deviation.
If the value is set to 10000, the controller
acts as a pure proportional controller with a
P-band based on the value set in
parameter 20-93 PID Proportional Gain. When
no deviation is present, the output from the
proportional controller is 0.
21-23 Ext. 1
Dierentation Time
Range: Function:
0 s* [0 - 10 s] The dierentiator does not react to a constant
error. It only provides a gain when the feedback
changes. The quicker the feedback changes, the
stronger the gain from the dierentiator.
21-24 Ext. 1 Dif. Gain Limit
Range: Function:
5* [1 - 50 ] Set a limit for the dierentiator gain (DG). The DG
increases if there are fast changes. Limit the DG to
obtain a pure dierentiator gain at slow changes
and a constant dierentiator gain where quick
changes occur.
3.19.4 21-3* Closed Loop 2 Ref/Fb
21-30 Ext. 2 Ref./Feedback Unit
Option: Function:
See parameter 21-10 Ext. 1 Ref./Feedback Unit for
details.
[0] None
[1] * %
[5] PPM
[10] 1/min
[11] RPM
21-30 Ext. 2 Ref./Feedback Unit
Option: Function:
[12] Pulse/s
[20] l/s
[21] l/min
[22] l/h
[23] m³/s
[24] m³/min
[25] m³/h
[30] kg/s
[31] kg/min
[32] kg/h
[33] t/min
[34] t/h
[40] m/s
[41] m/min
[45] m
[60] °C
[70] mbar
[71] bar
[72] Pa
[73] kPa
[74] m WG
[75] mm Hg
[80] kW
[120] GPM
[121] gal/s
[122] gal/min
[123] gal/h
[124] CFM
[125] ft³/s
[126] ft³/min
[127] ft³/h
[130] lb/s
[131] lb/min
[132] lb/h
[140] ft/s
[141] ft/min
[145] ft
[160] °F
[170] psi
[171] lb/in²
[172] in WG
[173] ft WG
[174] in Hg
[180] HP
21-31 Ext. 2 Minimum Reference
Range: Function:
0 ExtPID2Unit* [ -999999.999 -
par. 21-32
ExtPID2Unit]
See parameter 21-11 Ext. 1
Minimum Reference for
details.
Parameter Descriptions Programming Guide
MG11CE02 Danfoss A/S © 03/2015 All rights reserved. 155
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Danfoss Metasys N2 Specifications

General

Brand	Danfoss
Model	Metasys N2
Category	DC Drives
Language	English