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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.
Relationship between Kpp Value and Speed Change Rate
Torque
(
Speed
Change
Relationship between Speed Change Rate and Rated Rotation Speed
(
Speed
Change
Rate
P control
100 %
0
Figure 7-6 Torque characteristic (P/PI)
Speed
Rate
)
=
Synchronou
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Chapter 7
A044: 1
P052: 1
C001-C008: Intelligent input terminal
10
)
=
(%)
(
Kpp
Set
Value
)
PI control
(A)
Rotation Speed
Error
at
Rated
Torque
s
speed
base
29
FUNCTIONS
Relation
st
Control Method
st
Proportional gain
( )
A
frequency
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