Adjustment Of Pid Control - Toshiba TOSVERT VF-P7 Instruction Manual

(7) Over-ride
Over-ride function () is effective to the reference of process amount. Use this
function to tune the reference finely.
(8) Run frequency
Run frequency function () is effective to the process amount.
It is a function that the inverter will operate if the setup of the process amount becomes higher
than (+), and the inverter will stop operation if becomes lower than (-
).
(9) Change to the open loop control operation
When you change from PID operation (automatic operation) to open loop operation (manual
operation), assign PID control OFF selection function (36/37) to an input terminal (refer to 7.2.1
for details), or set the signal selection of PID control () at . At this time, since
acceleration/deceleration times are set short as described in (5), cautions are required.
Acceleration/deceleration times can be changed as occasion. (Refer to 6.23.2 for details)

3.3.3 Adjustment of PID control

Adjust the PID control gain to process amount, feedback signal and control object.
[Parameter settings]
Title
 Delay filter
 Proportional (P) gain
 Integral (I) gain
 PID deviation upper limit
 PID deviation lower limit
 Differential (D) gain
(1) Proportional gain
Proportional (P) gain () is proportional gain for PID control.
This gain is multiplied to deviation (difference between process amount and feedback amount)
and gives the amount of compensation that is proportional to deviation. Setting this parameter at
a large value gives a fast response, but too large value may result in an unstable phenomenon
like hunting.
Feedback amount
 is large.
Fast response
function
∼
∼
∼
∼ [%]
∼ [%]
∼
 is small.
Slow response
C-11
Adjustment range
Reference of
process amount
Time
Default setting





