Pid Control - Hitachi WJ200 Series Instruction Manual

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.
Func.
Name
Code
PID enable
A071
PID proportional gain
A072
PID integral time constant
A073
PID derivative time constant
A074
PV scale conversion
A075
PV source
A076
Reverse PID action
A077
PID output limit
A078
PID feed forward selection
a079
PID sleep function action
a156
threshold
PID sleep function action
a157
delay time
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.
"A" Function
Description
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
Integral time constant has a
range of 0.0 to 3600 seconds
Derivative time constant has a
range of 0.0 to 100 seconds
Process Variable (PV), scale
factor (multiplier), range of
0.01 to 99.99
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
Two option codes:
00...PID input = SP-PV
01...PID input = -(SP-PV)
Sets the limit of PID output as
percent of full scale,
range is 0.0 to 100.0%
Selects source of feed forward
gain, option codes:
00...Disabled
01...[O] terminal (voltage in)
02...[OI] terminal (current in)
Sets the threshold for the
action, set range 0.0~400.0 Hz
Sets the delay time for the
action, set range 0.0~25.5 sec
Defaults
Run
Mode
Lnitial data Units
Edit
00
1.0 −
1.0 sec
0.00 sec
1.00
00
00
0.0 %
00
0.00 Hz
0.0 sec
3−31
−
−
−
−
−