Mitsubishi FR-S500 Instruction Manual download pdf (Page 148)

139

Operation Panel Indication OV3 FR-PU04 OV During Dec

Name Regenerative overvoltage cut-off during deceleration or stop

Description

When the main circuit DC voltage in the inverter rises to or above

the specified value due to excessive regenerative energy during

deceleration or stop, 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 point Check for sudden speed reduction.

Corrective action

Increase the deceleration time. (Set the deceleration time which

matches the inertia moment of the load)

Decrease the braking duty.

Install a power factor improving reactor.

Operation Panel Indication THM FR-PU04 Motor Overload

Name

Motor overload cut-off (electronic thermal overcurrent protection)

(* 1)

Description

The electronic overcurrent protection in the inverter detects motor

overheat due to overload or reduced cooling capability during low-

speed operation to stop the inverter output. When a multi-pole

motor or two or more motors are run, provide a thermal relay in

the output side of the inverter.

Protection from burning due to motor temperature rise

Check point Check the motor for use under overload.

Corrective action

Reduce the load weight.

For the constant-torque motor, change the Pr. 71 setting to the

constant-torque motor setting.

Operation Panel Indication THT FR-PU04 Inv. Overload

Name

Inverter overload cut-off (electronic thermal overcurrent protection)

(* 1)

Description

If a current of more than 150% of the rated output current flows

and overcurrent shut-off does not occur (200% or less), inverse-

time characteristics cause the electronic overcurrent protection to

be activated to stop the inverter output in order to protect the

output transistors.

Output transistor protection from overheat

Check point Check the motor for use under overload.

Corrective action Reduce the load weight.

*1. Resetting the inverter initializes the internal heat integrating data of the

electronic overcurrent protection.

Operation Panel Indication FIN FR-PU04 H/Sink O/Temp

Name Fin overheat

Description

If the cooling fin overheats, the overheat sensor is actuated to

stop the inverter output.

Check point

Check for too high ambient temperature.

Check for cooling fin clogging.

Corrective action Set the ambient temperature to within the specifications.

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Mitsubishi FR-S500 Instruction Manual Page 148

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