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Chapter 7 FUNCTIONS
A044: 1
st
Control Method
P052: 1
st
Proportional gain
C001-C008: Intelligent input terminal
Relation
7.4 Speed control (P/PI) switching function
Speed control mode is normally controlled by proportional-
integration compensation (Pi), which keeps the deviation between
the actual speed and speed command becomes 0. Further, you can
also achieve a propotional control function, which can be used as
drooping operation (i.e. one load with several inverters) with this
option card.
Set P/PI switching function to one of the intelligent input terminal 1∼8 by the operator to achieve
this function. (Input ‘43’ in one of C001∼C008.) When this is turned on, control mode becomes
proportion control (P).
Please set proportional gain(Kpp ; a value used to decide the speed change rate) to H052 by a
digital operator. The relationship between the Kpp value and the speed change rate is shown below.
(%)
)ValueSetKpp(
10
=)RateChangeSpeed(
Relationship between Kpp Value and Speed Change Rate
Figure 7-6 Torque characteristic (P/PI)
()
frequencybasespeedsSynchronou
ATorqueRatedatErrorSpeed
=)RateChangeSpeed(
Relationship between Speed Change Rate and Rated Rotation Speed
0 Rotation Speed
Torque
100 %
PI controlP control
(A)