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5. PARAMETERS

5.7 (H) Protective function parameter

5.7.12 Stall prevention operation

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

due to overcurrent, overvoltage, etc. It can also limit the stall prevention and fast-response current limit operation during

acceleration/deceleration and power/regenerative driving.

• Stall prevention

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

to reduce the output current.

Also the second stall prevention function can limit the output frequency range in which the stall prevention function is enabled.

• Fast-response current limit

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

Pr. Name Initial

value

Setting range Description

H500

Stall prevention operation

level

110% 0 Stall prevention operation disabled.

0.1 to 400%

Set the current limit at which the stall prevention operation

will start.

156

H501

Stall prevention operation

selection

0 0 to 31, 100 to 101 Enable/disable the stall prevention operation and the fast-

response current limit operation.

H600

Second stall prevention

operation level

110% 0 Second stall prevention operation disabled.

0.1 to 400%

The stall prevention operation level can be changed using

the RT signal.

H601

Second stall prevention

operation frequency

0 Hz 0 Second stall prevention operation disabled.

0.01 to 590 Hz Set the frequency at which the Pr.48 stall prevention

operation will start.

9999 Pr.48 is enabled when RT signal is ON.

H610

Stall prevention operation

level compensation factor at

double speed

9999 0 to 200% The stall operation level when running at high speeds

above the rated frequency can be reduced.

9999 Stall prevention operation disabled at double speed.

H611

Stall prevention operation

reduction starting frequency

60 Hz 0 to 590 Hz Set the frequency at which the stall operation level

reduction will start.

148

H620

Stall prevention level at 0 V

input

110%

0 to 400%

The stall prevention operation level can be changed by the

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

149

H621

Stall prevention level at 10 V

input

120%

0 to 400%

154

H631

Voltage reduction selection

during stall prevention

operation

1 0 Output voltage

reduction enabled.

Enable/disable the output voltage

reduction during stall prevention

operation.

1 Output voltage

reduction disabled.

10 Output voltage

reduction enabled.

Use this setting when the

overvoltage protective function

(E.OV[ ]) activates during stall

prevention operation in an

application with large load inertia.

11 Output voltage

reduction disabled.

157

M430

OL signal output timer 0 s 0 to 25 s Set the OL signal output start time when stall prevention is

activated.

9999 No OL signal output.

858

T040

Terminal 4 function

assignment

0 0, 4, 9999 When set "4", the stall prevention level can be changed

with the signal to the terminal 4.

868

T010

Terminal 1 function

assignment

0 0, 4, 9999 When set "4", the stall prevention level can be changed

with the signal to the terminal 1.

874

H730

OLT level setting 110% 0 to 400% A trip can be set for when the stall prevention is activated

and the motor stalls. Set the output at which to activate the

trip.

V/FV/FV/F