Hitachi SJ7002 Series Instruction Manual page 188

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Function Code Parameter
H050 / H250 PI proportional gain
H051 / H251 PI integral gain
H052 / H252 P proportional gain
H070 PI proportional gain
for switching
H071 PI integral gain for
switching
H072 P proportional gain
for switching
H073 Gain switching time
The speed control mode is normally proportional-
integral compensation (PI), which attempts to
keep the deviation between the actual speed and
speed command equal to zero. You can also select
proportional (P) control function, which can be
used for droop control (i.e. several inverters
driving one load). Droop is the speed difference
resulting from P control versus PI control at 100%
output torque as shown in the graph. Set the P/PI
switching function (option 43) to one of the intel-
ligent input terminals [1] to [8]. When the P/PI
input terminal is ON, the control mode becomes
proportional control (P). When the P/PI input
terminal is OFF, the control mode becomes
proportional-integral control.
The proportional gain Kpp value determines the
droop. Set the desired value using parameter
H052. The relationship between the Kpp value and the droop is shown below:
The relationship between the droop and the rated rotation speed is shown below:
Droop
Setting Range
0.0 to 999.9/1000
0.0 to 999.9/1000
0.01 to 10.00
0.0 to 999.9/1000
0.0 to 999.9/1000
0.0 to 10.0
0. to 999.
Torque
100%
10
( )
------------------------------- -
Droop =
(Kpp Set Value)
Speed error at rated torque
--------------------------------------------------------------------- -
=
Synchronous speed base frequency
SJ700 Inverter
2
Description
% gain
% gain
No dimension
% gain
% gain
No dimension
Millisceonds
P Control PI Control
Droop
0
Speed of rotation
%
4–27