Mitsubishi Electric F700 Instruction Manual download pdf (Page 70)

Causes and corrective actions

TROUBLESHOOTING

(2) Warnings

When the protective function is activated, the output is not shut off.

Operation Panel

Indication

OL FR-PU04 OL

Name

Stall prevention (overcurrent)

Description

During

acceleration

If a current of more than 120% of the rated inverter current flows in the motor, this

function stops the increase in frequency until the overload current reduces to

prevent the inverter from resulting in overcurrent shut-off.

When the overload current has reduced below 120%, this function increases the

frequency again.

During

constant-

speed

operation

If a current of more than 120% of the rated inverter current flows in the motor, this

function lowers the frequency until the overload current reduces to prevent

overcurrent shut-off. When the overload current has reduced below 120%, this

function increases the frequency up to the set value.

During

deceleration

If a current of more than 120% of the rated inverter current flows in the motor, this

function stops the decrease in frequency until the overload current reduces to

prevent the inverter from resulting in overcurrent shut-off.

When the overload current has reduced below 120%, this function decreases the

frequency again.

Check point

1. Check that the Pr. 0 Torque boost setting is not too large.

2. Check that the Pr. 7 Acceleration time and Pr. 8 Deceleration time settings are not too small.

3. Check that the load is not too heavy.

4. Are there any failure in peripheral devices?

5. Check that the Pr. 13 Starting frequency is not too large.

Check the motor for use under overload.

Corrective action

1. Increase or decrease the Pr. 0 Torque boost value 1% by 1% and check the motor status. (Refer to page 52.)

2. Set a larger value in Pr. 7 Acceleration time and Pr. 8 Deceleration time. (Refer to page 54.)

3. Reduce the load weight.

4. Try simple magnetic flux vector control (Pr. 80).

5. Change the Pr. 14 Load pattern selection setting.

6. Set stall prevention operation current in

Pr. 22 Stall prevention operation level

. (The initial value is 120%.)

The acceleration/deceleration time may change. Increase the stall prevention operation level with

Pr. 22

Stall prevention operation level

, or disable stall prevention with

Pr. 156 Stall prevention operation selection

(Use

Pr. 156

to set either operation continued or not at OL operation.)

Operation Panel

Indication

oL FR-PU04 oL

Name

Stall prevention (overvoltage)

Description

During

deceleration

· If the regenerative energy of the motor becomes excessive and exceeds the

regenerative energy consumption capability, this function stops the decrease in

frequency to prevent overvoltage shut-off. As soon as the regenerative energy

has reduced, deceleration resumes.

· If the regenerative energy of the motor becomes excessive when regeneration

avoidance function is selected (Pr. 882 = 1), this function increases the speed to

prevent overvoltage shut-off. (Refer to the Instruction Manual (applied).)

Check point

· Check for sudden speed reduction.

· Regeneration avoidance function (Pr. 882 to Pr. 886) is being used? (Refer to the Instruction Manual

(applied).)

Corrective action

The deceleration time may change.

Increase the deceleration time using Pr. 8 Deceleration time.

Operation Panel

Indication

PS FR-PU04 PS

Name

PU Stop

Description

Stop with of the PU is set in Pr. 75 Reset selection/disconnected PU detection/PU stop selection.

(For Pr. 75, refer to the Instruction Manual (applied).)

Check point

Check for a stop made by pressing of the operation panel.

Corrective action

Turn the start signal off and release with .

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Mitsubishi Electric F700 Instruction Manual Page 70

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