Toshiba Tosvert VF-S15

E6582175
F-84
6
3) Setting PID control
Set "" (Process type PID control operation) in the parameter f360 (PID control).
(1) Set parameters acc(acceleration time) and dec (deceleration time) to the system fitting values.
(2) Please set the following parameters to place limits to the setting value and the control value.
Placing a limit to the PID set value : The parameter f367(Upper limit of set value), f368 (Lower limit of
set value)
Placing a limit to the output frequency : The parameter ul(Upper limit frequency ), ll (Lower limit
frequency )
Note 4: Assigning the function number 36 (PID control prohibition) to an input terminal. PID control function is
stopped temporarily while the terminal is ON.
4) Adjusting the PID control gain level
Adjust the PID control gain level according to the PID set value, the feedback value and the object to be
controlled.
[Parameter settings]
Title Function Adjustment range Default setting
f362
Proportional gain (P) 0.01 - 100.0 0.30
f363
Integral gain (I) 0.01 - 100.0 (1/ s
-1
) 0.20
f366
Derivative gain (D) 0.00 - 2.55 (s) 0.00
f362 (P-gain adjustment parameter)
This parameter adjusts the proportional gain level during PID control. A correction value proportional to
the particular deviation (the difference between the PID set value and the feedback value) is obtained
by multiplying this deviation by the parameter setting.
A larger P-gain adjustment value gives faster response. Too large an adjustment value, however,
results in an unstable event such as hunting.
PID set value
Output frequency
Time
Fast respons
e
(f362=Larg
e
gain
)
Slow response
(
f362=small gain)