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

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
Name
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
0
-5V -2.5V
(-10V) (-5V)
Forward rotation
STF signal
is ON
STF signal
Forward rotation
is ON
(a) When Pr. 73 setting is 0 to 5
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
+2.5V +5V Terminal 1
(+5V) (+10V)
STF signal
is ON
STF signal
is ON
Auxiliary input characteristics
Frequency/torque setting by analog
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.
Pr. 242
100(%)
Pr. 243
100(%)
Output frequency
When voltage across
terminals 2-5 is 2.5V
(5V)
0
-5V -2.5V +2.5V
(-10V) (-5V) (+5V)
Reverse rotation Forward rotation
Reverse rotation
Forward rotation
(b) When Pr. 73 setting is 10 to 15
input (terminal 1, 2, 4)
Description
When voltage
across terminals
2-5 is 0V
+5V Terminal 1
(+10V)
277
Pr.72
page 271
Pr.74
page 279
Pr.241
page 280
Pr.244
page 365
Pr.251
page 263
Pr.255
page 366
4