Toshiba TOSVERT VF-S9 Instruction Manual page 118

2) Types of PI control interfaces
Process quantity input data (frequency) and feedback input data can be combined as follows for the PI con-
trol of the VF-S9:
Process quantity input data (frequency setting)
Setting method
(1) Internal potentiometer setting
(2) Panel input setting
(3) Internal preset-speed setting
(4) External analog setting
Note: When PI control is selected (
3) Setting PI control
Set " " in the extended parameter
(1)
(2)
6
4) Adjusting the PI control gain level
Adjust the PI control gain level according to the process quantities, the feedback signals and the object to be
controlled.
The following parameters are provided for gain adjustment:
Parameter
VIB (DC: 0-10V)
case, therefore, since II or VIA is reserved for feedback signal input only, frequency setting by switching
to VIB cannot be executed.
Set parameters (acceleration time) and
sec).
To limit the output frequency, set parameters
quency). If process quantities are set from the operation panel, however, the process quantity setting
range will be limited by the settings of
Setting range
0.01 ∼ 100.0
(P-gain)
0.01 ∼ 100.0
(I-gain)
(P-gain adjustment parameter)
This parameter adjusts the proportional gain level during PI control. A correction value proportional to
the particular deviation (the difference between the set frequency 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, re-
sults in an unstable event such as hunting.
Fast response
Frequency setting mode
= "1"), frequency priority selection (
(PI control).
(deceleration time) to their minimum values (0.1
(upper limit frequency) and
and .
Default setting
Process quantity setting value
Slow response
Time
F-34
E6580757
Feedback input data
External analog input
(1)II(DC:4 ∼ 20mA)
(2)VIA(DC:0 ∼ 10V)
) is disabled. In this
(lower limit fre-
0.30
0.20