Mitsubishi Electronics FR-A700 Manual De Usuario

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BCN-C22005-634

(1) To further prevent a trip (Pr. 154)  

 When  Pr. 154 is set to "0, 10", the output voltage reduces during stall prevention operation. By making this

setting, an overcurrent trip becomes less likely to occur. Use this function when torque reduction does not pose
a problem.



= "10, 11" when the overvoltage protective function (E.OV) activates during stall prevention

The setting values "10 and 11" are added for Pr.154 Voltage reduction selection during stall prevention operation.

1

0

With voltage 
reduction

You can select whether to use 
output voltage reduction during 
stall prevention operation or not.

1

Without voltage 
reduction

10

With voltage 
reduction

Use these settings when the 
overvoltage protective function 
(E.OV) activates during stall 
prevention operation in an 
application with large load inertia.

11

Without voltage 
reduction

Regenerative overvoltage trip during acceleration

If regenerative energy causes the inverter's internal main circuit DC voltage to reach or exceed the 
specified value, the protective circuit is activated to stop the inverter output. The circuit may also be 
activated by a surge voltage produced in the power supply system.

· Check for too slow acceleration. (e.g. during descending acceleration with lifting load)
· Check if Pr.22 Stall prevention operation level is set too low like the no-load current.


· Decrease the acceleration time.
· Use the regeneration avoidance function (Pr. 882 to Pr. 886). (

 Refer to Chapter 4 of the Instruction 

Manual (Applied).)

· Set a value larger than the no load current in Pr. 22 Stall prevention operation level.


Set Pr.154 Voltage reduction selection during stall prevention operation = "10 or 11". (

Chapter 4 of the Instruction Manual (Applied).)

Regenerative overvoltage trip during constant speed

If regenerative energy causes the inverter's internal main circuit DC voltage to reach or exceed the 
specified value, the protective circuit is activated to stop the inverter output. The circuit may also be 
activated by a surge voltage produced in the power supply system.

· Check for sudden load change.
· Check if Pr.22 Stall prevention operation level is set too low like the no-load current.


· Keep load stable.
· Use the regeneration avoidance function (Pr. 882 to Pr. 886). (

 Refer to Chapter 4 of the Instruction 

Manual (Applied).)

· Use the brake unit or power regeneration common converter (FR-CV) as required.
· Set a value larger than the no load current in Pr. 22 Stall prevention operation level.


Set Pr.154 Voltage reduction selection during stall prevention operation = "10 or 11". (

Chapter 4 of the Instruction Manual (Applied).)

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