Sourcetronic ST600 Series - Page 189

Frequency Inverter ST600 Series High-Performance Multifunction VFD Function parameter list
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characteristics
feedback signal is larger than the PID reference, which
requires the VFD output frequency to decrease for PID
to reach balance, eg, tension PID control of winding
1: PID output is negative characteristics: namely the
feedback signal is less than PID reference, which
requires VFD output frequency to increase for PID to
reach balance, eg, tension PID control of unwinding.
P09.04
Proportional gain
(Kp)
This function code is suitable for proportional gain P of
PID input.
It determines the regulation intensity of the whole PID
regulator, the larger the value of P, the stronger the
regulation intensity. If this parameter is 100, it means
when the deviation between PID feedback and
reference is 100%, the regulation amplitude of PID
regulator (ignoring integral and differential effect) on
output frequency command is the max. frequency
(ignoring integral and differential actions).
Setting range: 0.00–100.00
1.80
○
P09.05
Integral time (Ti)
This parameter determines the speed of PID adjustor to
carry out integral adjustment on the deviation between
PID feedback and reference.
When the deviation between PID feedback and
reference is 100%, the integral adjustor works
continuously after the time (ignoring the proportional
effect and differential effect) to achieve the max. output
frequency (P00.03) or the max. voltage (P04.31).
Shorter the integral time is, stronger the regulation
intensity is.
Setting range: 0.00–10.00s
0.90s
○
P09.06
Differential time
(Td)
This parameter determines the strength of the change
ratio when PID carries out integral adjustment on the
deviation of PID feedback and reference.
If the PID feedback changes by 100% during this
period, the adjustment of differential regulator (ignoring
the proportional effect and differential effect) is the max.
output frequency (P00.03) or the max. voltage (P04.31).
Longer the derivative time is, stronger the regulation
intensity is.
Setting range: 0.00–10.00s
0.00s
○
P09.07
Sampling cycle (T)
It means the sampling cycle of feedback. The regulator
operates once during each sampling cycle. The larger
the sampling cycle, the slower the response.
Setting range: 0.001–10.000s
0.001s
○
P09.08
Limit of PID control
deviation
It is the max. allowable deviation of PID system output
value relative to closed-loop reference value. Within this
limit, PID regulator stops regulation. Set this function
code properly to regulate the precision and stability of
PID system.
0.0%
○