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Analog Input Compensation (pr. 73, Pr. 242, Pr. 243, Pr. 252, Pr. 253) - Mitsubishi Electric FR-A720-0.4K Instruction Manual

Fr-a700 series.
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Frequency/torque setting by analog
input (terminal 1, 2, 4)

4.21.3 Analog input compensation (Pr. 73, Pr. 242, Pr. 243, Pr. 252, Pr. 253)

A fixed ratio of analog compensation (override) can be made by the added compensation or terminal 2 as an
auxiliary input for multi-speed operation or the speed setting signal (main speed) of the terminal 2 or terminal 4.
Parameter
Number
73
Analog input selection
Terminal 1 added compensation
242
amount (terminal 2)
Terminal 1 added compensation
243
amount (terminal 4)
252
Override bias
253
Override gain
(1) Added compensation (Pr. 242, Pr. 243)
Forward
Inverter
rotation
STF
SD
10
2
5
1
Auxiliary input
0 to
10V( 5V)
Added compensation
connection example
Output frequency
-5V
-2.5V
(-10V)
(-5V)
STF Signal
ON
STF Signal
ON
(a) When Pr. 73 setting is 0 to 5
CAUTION
⋅ When the Pr. 73 setting was changed, check the voltage/current input switch setting. Different setting may cause a fault, failure
or malfunction. (Refer to page 275 for setting.)
278
Name
Initial Value
1
100%
75%
50%
150%
⋅ The compensation signal can be input for the main speed setting for
synchronous/continuous speed control operation, etc.
⋅ Setting any of "0 to 3, 6, 7, 10 to 13, 16, 17" in Pr. 73 adds the voltage across
terminals 1-5 to the voltage signal across terminals 2-5.
⋅ If the result of addition is negative, it is regarded as 0 at the Pr. 73 setting of any
of "0 to 3, 6, 7", or reverse rotation operation (polarity reversible operation) is
performed when the STF signal turns on at the Pr. 73 setting of any of "10 to 13,
16, 17".
⋅ The compensation input of the terminal 1 can also be added to the multi-speed
setting or terminal 4 (initial value 4 to 20mA).
⋅ The added compensation for terminal 2 can be adjusted by Pr. 242, and the
compensation for terminal 4 by Pr. 243.
Analog command value using terminal 2
= Terminal 2 input + Terminal 1 input ×
Analog command value using terminal 4
= Terminal 4 input + Terminal 1 input ×
When voltage across
terminals 2-5 is 2.5V
(5V)
When voltage
across terminals
2-5 is 0V
0
+2.5V
+5V
Terminal 1
(+10V)
(+5V)
Forward rotation
Forward rotation
Auxiliary input characteristics
Setting
Range
0 to 3, 6, 7, 10
Added compensation
to 13, 16, 17
4, 5, 14, 15
Override compensation
Set the ratio of added compensation amount
0 to 100%
when terminal 2 is the main speed.
Set the ratio of added compensation amount
0 to 100%
when terminal 4 is the main speed.
Set the bias side compensation value of
0 to 200%
override function.
Set the gain side compensation value of
0 to 200%
override function.
Output frequency
-5V
-2.5V
(-10V)
(-5V)
Reverse rotation
STF Signal
ON
Reverse rotation
Forward rotation
STF Signal
ON
(b) When Pr. 73 setting is 10 to 15
Description
Pr. 242
100(%)
Pr. 243
100(%)
When voltage across
terminals 2-5 is 2.5V
(5V)
When volta
across term
2-5 is 0V
0
+2.5V
+5V
Terminal 1
(+10V)
(+5V)
Forward rotation

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