Mitsubishi Electronics FR-A700 Manual De Usuario

*

This parameter allows its setting to be changed during the operation in any operation mode even if "0 (initial value) or 1" is set in Pr.77 Parameter
write selection.

 

This function monitors the output current and automatically changes the output frequency to prevent the inverter

to trip due to overcurrent, overvoltage, etc. It can also limit stall prevention and fast response current limit

operation during acceleration/deceleration, driving or regeneration. Invalid under Real sensorless vector control

or vector control.

Stall prevention

If the output current exceeds the stall prevention operation level, the output frequency of the inverter is

automatically varied to reduce the output current.

Also the second stall prevention function can restrict the output frequency range in which the stall prevention

function is valid. (Pr. 49)

Fast response current limit

If the current exceeds the limit value, the output of the inverter is shut off to prevent an overcurrent.

*

150%

0

Stall prevention operation selection becomes invalid.

0.1 to 400%

Set the current value at which stall prevention 

operation will be started.

9999

0 to 200%

The stall operation level can be reduced when 

operating at a high speed above the rated frequency.

9999

Constant according to Pr. 22

150%

0

Second stall prevention operation invalid

0.1 to 220%

The second stall prevention operation level can be set.

0Hz

0

Second stall prevention operation invalid

0.01 to 400Hz

Set the frequency at which stall prevention operation 

of Pr. 48 is started.

9999

Pr. 48 is valid when the RT signal is ON.

60Hz

0 to 400Hz

Set the frequency at which the stall operation level 

starts being reduced.

150%

0

Third stall prevention operation invalid

0.1 to 220%

Stall prevention operation level can be changed with 

the X9 signal.

0Hz

0

Third stall prevention operation invalid

0.01 to 400Hz

Set the frequency at which stall prevention operation 

when the X9 signal is ON starts.

150%

0 to 220%

Stall prevention operation level can be changed by 

the analog signal input to terminal 1 (terminal 4).

200%

0 to 220%

1

0

With voltage 

reduction

You can select whether to use 

output voltage reduction 

during stall prevention 

operation or not.

1

Without voltage 

reduction

0

0 to 31,

100, 101

You can select whether stall prevention operation and 

fast response current limit operation will be performed 

or not.

0s

0 to 25s

Set the output start time of the OL signal output when 

stall prevention is activated.

9999

Without the OL signal output

0

0, 1, 4, 9999

By setting "4", the stall prevention operation level can 

be changed with a signal to terminal 4.

0

0 to 6, 9999

By setting "4", the stall prevention operation level can 

be changed with a signal to terminal 1.

⋅ Set in Pr. 22 the ratio of the output current to the rated inverter current at 

which stall prevention operation will be performed. Normally set 150% 
(initial value).

⋅ Stall prevention operation stops acceleration (makes deceleration) during 

acceleration, makes deceleration during constant speed, and stops 
deceleration during deceleration.

⋅ When stall prevention operation is performed, the OL signal is output.

Stall prevention operation example

OL

Output current

Output frequency

Acceleration

Constant 

speed

Deceleration

Time