Mitsubishi Electric FR-A820-00046 (0.4K) Instruction Manual page 480

• Set "0 to 3, 6, 7, 10 to 13, 16, or 17" in Pr.73 to add the voltage determined by the terminal 1 input when the main speed
setting is input through terminal 2.
• When a negative voltage obtained from the addition, it is regarded as 0 and the operation is stopped when Pr.73 = "0 to
3, 6, or 7", and the operation is reversed (polarity reversible operation) after the STF signal is turned ON when Pr.73 = "10
to 13, 16, or 17".
• The terminal 1 compensation input can be added to the multi-speed setting or terminal 4 (initial value: 4 to 20 mA).
• 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
When voltage across
terminals 2 and 5 is 2.5 V
(5 V)
0
-5 V -2.5 V +2.5 V
(-10 V) (-5 V) (+5 V)
Forward rotation
STF Signal
ON
Forward rotation
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
Inverter
rotation
STF
SD
10
Override
2
setting
5
Main
1
(+)
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.
When voltage
across terminals
2 and 5 is 0 V
+5 V Terminal 1
(+10 V)
Reverse rotation
STF Signal
ON
Reverse rotation
STF Signal
ON
Auxiliary input characteristics
page 473 for the setting.)
Pr.242
100(%)
Pr.243
100(%)
Output frequency
When voltage across
terminals 2 and 5 is 2.5 V
(5 V)
0
-5 V -2.5 V +2.5 V
(-10 V) (-5 V) (+5 V) (+10 V)
Forward rotation
Forward rotation
(b) When Pr.73 setting is 10 to 13
5.12 (T) Multi-function input terminal parameters
When voltage
across terminals
2 and 5 is 0 V
+5 V Terminal 1
5. PARAMETERS
1
2
3
4
5
6
7
8
9
10
479