Mitsubishi Electric FR-A800 Series Instruction Manual page 503

• The degree of addition to terminal 2 is adjustable with Pr.242 and the degree of addition to terminal 4 is adjustable with
Pr.243.
Analog command value with use of terminal 2 = terminal 2 input + terminal 1 input ×
Analog command value with use of terminal 4= terminal 4 input + terminal 1 input ×
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
NOTE
• After changing the Pr.73 setting, check the setting of the voltage/current input selection switch. Incorrect setting may cause a
fault, failure, or malfunction. (Refer to
 Override function (Pr.252, Pr.253)
Forward
rotation
Override
setting
Main
(+)
speed (-)
Connection example for the
override function
• Use the override function to make the main speed changed at a specified rate.
• Set "4, 5, 14, or 15" in Pr.73 to select the override function.
• When the override function is selected, terminal 1 or 4 is used for the main speed setting, and terminal 2 is used for the
override signal. (If the main speed signal is not input through terminal 1 or 4, the compensation by terminal 2 is disabled.)
• Specify the scope of override by using Pr.252 and Pr.253.
• How to calculate the set frequency when the override function is used:
Main speed setting frequency (Hz): Terminals 1 or 4 input, multi-speed setting
Compensation (%): Terminal 2 input
Set frequency (Hz) = Main speed setting frequency (Hz) ×
502
5. PARAMETERS
5.12 (T) Multi-function input terminal parameters
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When voltage across
terminals 2 and 5 is 2.5 V
(5 V)
When voltage
across terminals
2 and 5 is 0 V
0 +5 V Terminal 1
+2.5 V
(+5 V) (+10 V)
Forward rotation
STF Signal
ON
Forward rotation
STF Signal
ON
Auxiliary input characteristics
page 496
Inverter
STF
SD
10
2
5
1
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Pr.242
100(%)
Pr.243
100(%)
Output frequency
When voltage across
terminals 2 and 5 is 2.5 V
(5 V)
-5 V -2.5 V 0
+2.5 V
(-10 V) (-5 V) (+5 V)
Reverse rotation Forward rotation
Reverse rotation
Forward rotation
(b) When Pr.73 setting is 10 to 13
for the setting.)
Compensation (%)
100(%)
When voltage
across terminals
2 and 5 is 0 V
+5 V Terminal 1
(+10 V)