Danfoss VLT FC 100 Series Programming Manual page 153

Parameter Description
21-14 Ext. 1 Feedback Source
Option:
3 3
[0] No function
*
[1] Analog input 53
[2] Analog input 54
[3] Pulse input 29
[4] Pulse input 33
[7] Analog input X30/11
[8] Analog input X30/12
[9] Analog Input X42/1
[10] Analog Input X42/3
[11] Analog Input X42/5
[15] Analog Input X48/2
[100] Bus feedback 1
[101] Bus feedback 2
[102] Bus feedback 3
21-15 Ext. 1 Setpoint
Range:
0.000
ExtPID1Unit
*
21-17 Ext. 1 Reference [Unit]
Range:
0.000
ExtPID1Unit
*
21-18 Ext. 1 Feedback [Unit]
Range:
0.000
ExtPID1Unit
*
3-126
VLT
Function:
This parameter defines which input
on the Adjustable frequency drive
should be treated as the source of
the feedback signal for the Closed-
Loop 1 controller. Analog input
X30/11 and Analog input X30/12
refer to inputs on the General
Purpose I/O.
Function:
[ par. 21-11 - The setpoint reference is
par. 21-12 used in extended 1 closed-
ExtPID1Unit] loop. Ext.1 Setpoint is added
to the value from the Ext.1
Reference source selected in
21-13 Ext. 1 Reference Source.
Function:
[-999999.999 - Readout of the
999999.999 reference value for the
ExtPID1Unit] closed-loop 1
controller.
Function:
[-999999.999 - Readout of the
999999.999 feedback value for the
ExtPID1Unit] closed-loop 1
controller.
MG11CD22 - VLT
®
HVAC Drive Programming Guide
21-19 Ext. 1 Output [%]
Range:
0 % [0 - 100 %] Readout of the output value for the closed-
*
3.19.3 21-2* Closed-loop 1 PID
21-20 Ext. 1 Normal/Inverse Control
Option:
[0] Normal Select Normal [0] if the output should be reduced
[1] Inverse Select Inverse [1] if the output should be increased
21-21 Ext. 1 Proportional Gain
Range:
0.01 [0.00 - 10.00 ] The proportional gain indicates the
*
If (Error x Gain) jumps with a value equal to what is set in
20-14 Maximum Reference/Feedb., the PID controller will try
to change the output speed equal to what is set in
4-13 Motor Speed High Limit [RPM]/4-14 Motor Speed High
Limit [Hz] but in practice of course limited by this setting.
The proportional band (error causing output to change
from 0‒100%) can be calculated by means of the formula:
(
1
Proportional Gain
® is a registered Danfoss trademark
Function:
loop 1 controller.
Function:
when feedback is higher than the reference.
when feedback is higher than the reference.
Function:
number of times the error between the
setpoint and the feedback signal is to be
applied.
)
× ( Max Reference )