Mitsubishi Electric FR-A700 EC, Instruction Manual

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Parameter Frequency/torque setting by analog input (terminals 1, 2 and 4)
FR-A700 EC 6 - 377
6.20.3 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.
Added compensation (Pr. 242, Pr. 243)
A compensation signal can be input to 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 ter-
minal 4 (initial value 0/4 to 20mA).
The added compensation for terminal 2 can be adjusted by Pr. 242, and the compensation for
terminal 4 by Pr. 243:
Pr.
No.
Name
Initial
Value
Setting
Range
Description Parameters referred to
Refer to
Section
73
Analog input selection 1
0–3/6/7/
10–13/
16/17
Added compensation
28
73
Multi-speed input
compensation
selection
Analog input
selection 6.10.3
6.20.2
4/5/14/15 Override compensation
242
Terminal 1 added compen-
sation amount (terminal 2)
100% 0–100%
Set the ratio of added compensation
amount when terminal 2 is the main
speed.
243
Terminal 1 added compen-
sation amount (terminal 4)
75% 0–100%
Set the ratio of added compensation
amount when terminal 4 is the main
speed.
252
Override bias 50% 0–200%
Set the bias side compensation value of
override function.
253
Override gain 150% 0–200%
Set the gain side compensation value of
override function.
Fig. 6-180:
Added compensation connection example
I001186E
Inverter
Forward rotation
Auxiliary input
0 to
±
10V (
±
5V)
Main
speed
Analog command value using terminal terminal 2 Terminal 2 input Terminal 1 input +
Pr. 242
100 [%]
--------------------
×
=
Analog command value using terminal terminal 4 Terminal 4 input Terminal 1 input +
Pr. 243
100 [%]
--------------------
×
=