Mitsubishi Electric F700 Instruction Manual download pdf (Page 38)

Overheat protection of the motor by the inverter

(Pr.9)

DRIVE THE MOTOR

3.3 Overheat protection of the motor by the inverter (Pr.9)

Set this parameter when using a motor other than the Mitsubishi standard motor (SF-JR) and Mitsubishi constant

torque motor (SF-HRCA).

Set the rated motor current in Pr. 9 Electronic thermal O/L relay to protect the motor from overheat.

Parameter

Number

Name Initial Value Setting Range *2 Description

9 Electronic thermal O/L relay

Rated inverter

output current

55K or less

0 to 500A

Set the rated motor current.

75K or more

0 to 3600A

*1 Refer to page 91 for the rated inverter current value.

*2 The minimum setting increments are 0.01A for the 55K or less and 0.1A for the 75K or more.

Changing example Change the Pr. 9 Electronic thermal O/L relay setting to 2.5A according to the motor rated current.

CAUTION

· Protective function by electronic thermal relay function is reset by inverter power reset and reset signal input. Avoid

unnecessary reset and power-off.

· When two or more motors are connected to the inverter, they cannot be protected by the electronic thermal relay function.

Install an external thermal relay to each motor.

· When the difference between the inverter and motor capacities is large and the setting is small, the protective

characteristics of the electronic thermal relay function will be deteriorated. In this case, use an external thermal relay.

· A special motor cannot be protected by the electronic thermal relay function. Use an external thermal relay.

· PTC thermistor output built-in the motor can be input to the PTC signal (AU terminal). For details, refer to the Instruction

Manual (applied).

5.Press to show the currently

set value.

3.Press to choose the parameter

setting mode.

Flicker ··· Parameter setting complete!!

7.Press to set.

· Press to show the setting again.

· Press twice to show the next parameter.

· By turning , you can read another parameter.

4.Turn until Pr. 9 electronic

thermal O/L relay appears.

6.Turn clockwise to change

the set value to "2.5". (2.5A)

1.Screen at powering on

The monitor display appears.

2.Press to choose the PU

operation mode.

PU indication is lit.

The parameter number

read previously appears.

Display

Operation

(2.1A for 0.75K)

Refer to page

91 for initial

value of the

inverter rated

current.

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Mitsubishi Electric F700 Instruction Manual Page 38

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