6-3
o02
o03
Speed Control (P Gain)
Speed Control (Integral time)
These function codes specify the PI constants of a speed controller. The expression below
shows the transfer function of the controller.
ε)
sT
1
(1kf
I
PS
×+=
K
p
: P gain (o02)
T
I
: Integral time (o03)
f
S
: Slip frequency
ε : Speed deviation
s : Laplace operator
Suppose that the P gain is 1.0 when the speed deviation ε = 100% (Maximum Frequency F03
(A01)) and f
S
is 1% of the maximum frequency.
Suppose that the I integral time = 1.000 seconds when the o03 data is 1.000.
Setting an excessive P gain may cause system hunting. A roughly recommended P gain
should not exceed 35.00 in the ordinary system.
Modifying F03 (A01) data requires readjustment of o02 and o03 data.
o04 Speed Control (Filter time constant)
This function code specifies a time constant determining a linear delay of the low pass filter for
the speed command given by pulse train. Use this function code to suppress an overshoot
that occurs, for example, when the speed command varies.
o09 Feedback Input (Encoder pulse resolution)
This function code specifies the resolution of the encoder mounted on the inverter-driven
motor.
o10 Feedback Input (Filter time constant)
This function code specifies a time constant determining a linear delay of the low pass filter for
the speed feedback given by pulse train. Use this function when large ripple components
superpose the feedback pulse train.
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