Mitsubishi Electronics FR-F700-NA ユーザーズマニュアル

Adjustment of the output torque (current) of the motor

The above parameters can be set when Pr. 160 User group read selection = "0". (Refer to page 190)
*1

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

*2

When Pr. 570 Multiple rating setting = "1", performing inverter reset and all parameter clear changes the initial value and setting range. (Refer to
page 86)

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

from coming 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.

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.

Fast-response current limit

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

22 *1

110% *2

0

Stall prevention operation selection becomes invalid.

0.1 to 120% *2 Set the current value at which stall prevention 

operation will be started.

9999

Analog variable

9999

0 to 150% *2

The stall operation level can be reduced when 

operating at a high speed above the rated frequency.

9999

Constant according to Pr. 22

110% *2

0

Second stall prevention operation invalid

0.1 to 120% *2 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 is 

started to reduce.

110% *2

0 to 120% *2

Stall prevention operation level can be changed by 

the analog signal input to terminal 1.

120% *2

0 to 120% *2

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

⋅ 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 110% 
(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.

⋅ If an overload status lasts long, an inverter trip (e.g. electronic thermal relay function (E.THM)) may occur.

⋅ When Pr. 156 has been set to activate the fast-response current limit (initial setting), the Pr. 22 setting should not be higher than

140%. The torque will not be developed by doing so. (When Pr. 570 =  "1")

Stall prevention operation example

Pr.22

OL

Output current

Output frequency

Acceleration

Constant 

speed

Deceleration

Time