Pid Control - Baldor VS1MD User Manual

8.4 PID Control

8-10
Group Display
H40
H50
H51
H52
Function
group 2
H53
H54
H55
H56
I/O group t1 to t8
Drive group d1
Set H40 to "2" [PID Feedback control].
Output frequency of the inverter is controlled by PID control for use as constant control of flow, pressure or
temperature.
H50: Select the feedback type of PID controller.
H50 [PID Feedback Selection]
H51: Set the percentage of output to error. If P Gain is set to 50%, 50% of the error
value will be output. Higher value can reach the target control value faster but it may
cause oscillation.
H52: Set the time to output the accumulated error value. Set the time required to
output 100% when the error value is 100%. If H52 [Integral time for PID controller (I
gain)] is set to 1 sec and the error becomes 100%, 100% will be output in 1 sec.
Adjusting the value may reduce the nominal error. If the value is reduced, response
will be faster but setting too low may lead to controller oscillation.
H53: Set the output value to the variation of the error. The error is detected by 0.01
sec in SV-iG5A. If differential time is set to 0.01 sec and the percentage variation of
error per 1 sec is 100%, 1% per 10msec is output.
H54: PID Feed Forward Gain. Set the gain to add the target value to the PID controller
output.
H55, H56: Limits the output of the PID controller.
I17 to I24: To go from PID to normal operation, set one of P1-P8 terminal to 21 and
turn ON.
d1: Calculates the feedback from H50 into Motor frequency and displays it.
Parameter Name
[Control Mode Selection]
[PID Feedback Selection]
[P Gain for PID Controller]
[I Gain for PID Controller]
[D Gain for PID Controller]
[F Gain for PID Controller]
[PID Output Frequency High Limit]
[PID Output Frequency Low Limit]
[Multi-function Input Terminal
P1-P8 Definition]
[Motor RPM]
0 Terminal I input (0 to 20[mA] )
1 Terminal V1 input (0 to 10[V])
Setting Range Default
2 0 to 3 0
- 0 to 1 0
- 0 to 999.9 300.0
- 0.1 to 32.0 1.0
- 0.0 to 30.0 0
0 to 999.9 0
- 0.1 to 400 60.0
- 0.1 to 400 0.50
21 0 to 25 -
VS1-MD AC Drive User Manual
Unit
-
-
%
sec
sec
%
Hz
Hz
-