Analog Input Compensation (Pr. 73, Pr. 242, Pr. 243, Pr. 252, Pr. 253) - Mitsubishi Electric FR-A700 Instruction Manual

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