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PID Control
When enabled, the built-in PID loop calculates an ideal inverter output value to cause a
loop feedback process variable (PV) to move closer in value to the set point (SP). The
frequency command serves as the SP. The PID loop algorithm will read the analog input
for the process variable (you specify the current or voltage input) and calculate the
output.
“A” Function
Run
Mode
Edit
Defaults
Func.
Code
Name Description Lnitial data Units
A071
PID enable Enables PID function,
three option codes:
00…PID Disable
01…PID Enable
02…PID Enable with reverse
output
Proportional gain has a range
of 0.00 to 25.00
U
00
−
A072
PID proportional gain
1.0
−
A073
PID integral time constant Integral time constant has a
range of 0.0 to 3600 seconds
Derivative time constant has a
range of 0.0 to 100 seconds
1.0 sec
A074
PID derivative time constant
0.00 sec
A075
PV scale conversion Process Variable (PV), scale
factor (multiplier), range of
0.01 to 99.99
U
1.00
−
A076
PV source Selects source of Process
Variable (PV), option codes:
00…[OI] terminal (current in)
01…[O] terminal (voltage in)
02…ModBus network
03…Pulse train input
10…Calculate function output
U
00
−
A077
Reverse PID action Two option codes:
00…PID input = SP-PV
01…PID input = -(SP-PV)
U
00
−
A078
PID output limit Sets the limit of PID output as
percent of full scale,
range is 0.0 to 100.0%
U
0.0 %
a079
PID feed forward selection Selects source of feed forward
gain, option codes:
00…Disabled
01…[O] terminal (voltage in)
02…[OI] terminal (current in)
U
00
−
a156
PID sleep function action
threshold
Sets the threshold for the
action, set range 0.0~400.0 Hz
U
0.00 Hz
a157
PID sleep function action
delay time
Sets the delay time for the
action, set range 0.0~25.5 sec
U
0.0 sec
NOTE: The setting A073 for the integrator is the integrator’s time constant Ti, not the
gain. The integrator gain Ki = 1/Ti. When you set A073 = 0, the integrator is disabled.
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