Mitsubishi Electric FR-D700 Instruction Manual page 4

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Alarm History

The previous EIGHT alarms are retrievable using the keypad

To access the Alarm menu

Press the mode button twice - E--- is displayed

Scroll through the alarm History

Press SET to read the Hz, Amps, Volts and hrs ON for each

alarm.

The inverter PC software "FR-Configurator V3" supports

diagnosis and setup for FR-D700.

Note - Alarm code and Hz, V and A information is important for diagnosis.

E.0 indicates there are no alarms.

General causes of alarms

For full information on alarm codes, please refer to the installation manual for the specific inverter.

Inverter Overload

Over current (OC1, OC2), and transistor thermal alarms (THT) are caused by too much current flowing in the inverter transistor circuits.

CHECK - Monitor the current during start-up and running.

1. E.OC1 Immediate over-current - output short-circuit or already rotating motor.

2. E.OC1 Over-current after 1 second - stalled motor, jammed motor, high friction,

Pr.14 may be incorrectly set to 1, torque boost (Pr.0) set too high

3. E.OC1 Overload after half speed - high inertia, acceleration (Pr.7) too fast, torque

level too low as Pr.14 may be set to 1.

4. E.OC2 Overload at steady speed - high motor current, sudden load increase,

incorrect pump rotation, single-phasing of the output.

Motor thermal overload

Pr.9 is set to the motor rated current. The inverter calculates the level of current at reduced speeds that will cause a temperature build-up in

the motor. If the E.THM alarm occurs but the motor is NOT hot, then the value can be increased to avoid nuisance tripping.

CHECK - Pr.0 - should be set as low as possible, while still allowing the motor to start

Pr.14 - can be set to 1 for clean water pumps

For a high load and low speed operation extra ventilation on the motor and Pr.71=1 can be used.

NOTE - This guide is designed as a simple guide and is not designed to replace the technical information in the product manuals.

For further help - Technical Help Desk

Mitsubishi D700 inverter quick set-up guide

01707 278990

www.mitsubishi-automation.co.uk

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automation.support@meuk.mee.com