Mitsubishi Electric FR-A820-00046 Instruction Manual page 576

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(T) Multi-Function Input Terminal Parameters
Addition compensation (Pr. 242, Pr. 243)
● A compensation signal is addable to the main speed setting for such as synchronous or continu-
ous 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
= terminal 2 input + terminal 1 input × (Pr. 242/100 [%])
Analog command value with use of terminal 4
= terminal 4 input + terminal 1 input × (Pr. 243/100 [%])
(–10 V)
STF signal
STF signal
Fig. 5-194:
NOTE
After changing the Pr. 73 setting, check the voltage/current input switch setting. Incorrect setting
may cause a fault, failure or malfunction. (For the settings, refer to page 5-389.)
5 - 396
Forward
Inverter
rotation
STF
SD
10
2
5
Auxiliary input
1
0 to 10 V (±5 V)
Output frequency
When voltage across
terminals 2 and 5 is 2.5 V
(5 V)
–5 V
–2.5 V
0
+2.5 V
+5 V
(–5 V)
(+5 V)
(+10 V)
Forward rotation
ON
Forward rotation
ON
(a) When Pr. 73 setting is 0 to 5
Auxiliary input characteristics
Fig. 5-193:
Example of addition compensation connection
When voltage
across terminals
2 and 5 is 0 V
Terminal 1
–5 V
(–10 V)
Reverse rotation
STF signal
ON
Reverse rotation
STF signal
ON
(b) When Pr. 73 setting is 10 to 15
Parameters
Output frequency
When voltage across
terminals 2 and 5 is 2.5 V
(5 V)
When voltage
across terminals
2 and 5 is 0 V
–2.5 V
0
+2.5 V
+5 V
(–5 V)
(+5 V)
(+10 V)
Forward rotation
Forward rotation
I002644E
Terminal 1
I001187E

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