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7.4
Speed
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
(
Speed
Relationship between Speed Change Rate and Rated Rotation Speed
control
(P/PI)
(
Speed
Change
Torque
P control
100 %
0
Figure 7-6 Torque characteristic (P/PI)
Change
Rate
)
=
Synchronou
switching
10
Rate
)
=
(
Kpp
Set
Value
Rotation Speed
Speed
Error
at
Rated
s
speed
23
Chapter 7
FUNCTIONS
Relation code
st
A044: 1
Control Method
st
P052: 1
Proportional gain
C001-C008: Intelligent input terminal
(%)
)
PI control
(A)
( )
Torque
A
base
frequency
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