Mitsubishi Electric FR-A820-00046 Instruction Manual page 616

(T) Multi-Function Input Terminal Parameters
Override function (Pr. 252, Pr. 253)
● Use the override function to make the main speed changed at a specified rate.
● Set Pr. 73 = "4, 5, 14, or 15" 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 is not input to the 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 for override:
– Set frequency (Hz) = Main speed setting frequency [Hz] × (Compensation [%]/100 [%])
– Main speed setting frequency (Hz): Terminals 1 or 4 input, multi-speed setting
– Compensation (%): Terminal 2 input
5 - 414
Forward
Inverter
rotation
STF
PC
10
Override
2
setting
5
Main
(+) 1
speed
(-)
0 V
2.5 V
(5 V)
Voltage across terminals 2 and 5
Fig. 5-199:
Connection example for the override function
Fig. 5-200:
Override
Initial value
(50 % to 150 %)
5 V
(10 V)
Parameters
I002645E_G
I001189E