Analog Input Compensation (Pr.73, Pr.242, Pr.243, Pr.252, Pr.253) - Mitsubishi Electric F700 Instruction Manual

3.15.2 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
The above parameters can be set when Pr. 160 User group read selection = "0". (Refer to page 140)
(1) Added compensation (Pr.242, Pr.243)
Forward
Inverter
rotation
STF
PC
10
2
5
1
Auxiliary input
0 to 10V( 5V)
added compensation
connection example
Output frequency
0
-5V -2.5V +2.5V
(-10V) (-5V)
(+5V)
Forward rotation
STF signal
ON
Forward rotation
(a) When Pr. 73 setting is 0 to 5
Initial Value
1
100%
75%
50%
150%
⋅ 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 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
+5V Terminal 1
(+10V)
STF signal
ON
Auxiliary input characteristics
Frequency setting by analog input (terminal 1, 2, 4)
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
0 to 100%
amount when terminal 2 is the main speed.
Set the ratio of added compensation
0 to 100%
amount 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
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
Description
Pr.242
100(%)
Pr.243
100(%)
When voltage
across terminals
2-5 is 0V
+5V Terminal 1
(+10V)
127
Pr. 72
page 124
Pr.74
page 128
Pr.241
page 129
Pr. 244
page 210
Pr. 251
page 117
Pr.255
page 211
3