Mitsubishi Electric FR-A800, Instruction Manual

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Parameters (T) Multi-Function Input Terminal Parameters
FR-A800 5 - 397
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
Fig. 5-195:
Connection example for the override function
I002645E
Fig. 5-196:
Override
I001189E
10
2
5
STF
SD
1
(-)
(+)
Main
speed
Override
setting
Forward
rotation
Inverter
Voltage across terminals 2 and 5
Initial value
(50 % to 150 %)
O
v
erride valu
e [%
]
Pr
. 2
5
2
, Pr
. 2
5
3
2.5 V
(5 V)
0 V 5 V
(10 V)