Analog Input Compensation - Mitsubishi Electric 800 Series Instruction Manual

(T) Multi-Function Input Terminal Parameters
5.12.3

Analog input compensation

Addition compensation or fixed ratio analog compensation (override) with terminal 2 set to auxiliary input is applicable
to the multi-speed operation or terminal 2/terminal 4 speed setting signal (main speed).
Pr.
73
Analog input selection
T000
Terminal 1 added
242
compensation amount
T021
(terminal 2)
Terminal 1 added
243
compensation amount
T041
(terminal 4)
252
Override bias
T050
253
Override gain
T051
Addition compensation (Pr.242, Pr.243)
Forward
Inverter
rotation
STF
SD
10
2
5
Auxiliary input 1
0 to 10 V( 5 V)
Example of addition
compensation connection
Output frequency
-5 V -2.5 V
(-10 V) (-5 V)
STF Signal
ON
STF Signal
ON
(a) When Pr.73 setting is 0 to 3
398
PARAMETERS
Name Initial value
1
100%
75%
50%
150%
• A compensation signal is addable to the main speed setting for such as synchronous
or continuous speed control operation.
• Setting a value of "0 to 3, 6, 7, 10 to 13, 16, and 17" to Pr.73 adds the voltage
between terminals 1 and 5 to the voltage signal of the terminals 2 and 5.
• When Pr.73= "0 to 3, 6, or 7", and if the result of addition is negative, it is regarded as
0 and the operation is stopped. When Pr.73 = "10 to 13, 16, or 17", the operation is
reversed (polarity reversible operation) with STF signal ON.
• The terminal 1 compensation input is addable to the multi-speed setting or terminal 4
(initial value: 4 to 20 mA).
• The degree of addition compensation to terminal 2 is adjustable with Pr.242.
The degree of addition compensation to terminal 4 is adjustable with Pr.243.
Analog command value
with use of terminal 2
Analog command value
with use of terminal 4
When voltage across
terminals 2 and 5 is 2.5 V
(5 V)
When voltage
across terminals
2 and 5 is 0 V
0
+2.5 V +5 V Terminal 1
(+10 V)
(+5 V)
Forward rotation
Forward rotation
Auxiliary input characteristics
Setting range
0 to 3, 6, 7, 10 to 13,
16, 17
4, 5, 14, 15
0 to 100%
0 to 100%
0 to 200%
0 to 200%
= terminal 2 input + terminal 1 input 
= terminal 4 input + terminal 1 input 
Output frequency
-5 V -2.5 V
(-10 V) (-5 V)
Reverse rotation
STF Signal
ON
Reverse rotation
STF Signal
ON
(b) When Pr.73 setting is 10 to 13
Description
Addition compensation
Override compensation
Set the percentage of addition
compensation when terminal 2 is set to
the main speed.
Set the percentage of addition
compensation when terminal 4 is set to
the main speed.
Set the percentage of override function
bias side compensation.
Set the percentage of override function
gain side compensation.
When voltage across
terminals 2 and 5 is 2.5 V
(5 V)
When voltage
across terminals
2 and 5 is 0 V
0
+2.5 V +5 V Terminal 1
(+10 V)
(+5 V)
Forward rotation
Forward rotation
Pr.242
100 (%)
Pr.243
100 (%)