Mitsubishi FR-S500 Instruction Manual download pdf (Page 63)

5. Wiring of the power supply and motor

For wiring the input (R, S, T) and output (U, V, W) terminals of the inverter, use

the UL-listed copper wires (rated at 75°C) and round crimping terminals. Crimp

the crimping terminals with the crimping tool recommended by the terminal

maker.

6. Motor overload protection

These inverters provide solid state motor overload protection.

Set parameter 9 using the following instructions,

(Pr. 9 "electronic thermal O/L relay").

• Set the rated current [A] of the motor.

(Normally set the rated current at 50Hz.)

• Setting "0" makes the electronic overcurrent protection (motor protective

function) invalid. (The inverter's protective function is valid).

• When using a Mitsubishi constant-torque motor, first set "1" in Pr. 71 to choose

the 100% continuous torque characteristic in the low-speed range. Then, set

the rated motor current in Pr. 9.

CAUTION

• When two or more motors are connected to the inverter, they cannot be

protected by the electronic overcurrent protection. 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 overcurrent

protection will be deteriorated.

In this cause, use an external thermal relay.

• A special motor cannot be protected by the electronic overcurrent protection.

Use an external thermal relay.

Reference: Motor overload protection characteristics

0 50 100 150 180 200

240

180

120

Operation time (s)

50% setting

(Note 1, 2)

100% setting

(Note 2)

(Note 1) When you set the 50% value (current

value) of the rated inverter output current.

(Note 2) The % value denotes the percentage of

the current value to the rated inverter

output current, not to the rated motor current.

(Note 3) This characteristic curve will be described

even under operation of 6Hz or higher

when you set the electronic overcurrent

protection dedicated to the Mitsubishi

constant-torque motor.

30Hz or higher

(Note 3)

Inverter output current (%)

(% to rated inverter output current)

Electronic overcurrent

protection for transistor

protection

20Hz

10Hz

Protection activating range

Range on the right of characteristic curve

Normal operating range

Range on the left of characteristic curve

1 2 ... 58 59 60 61 62 63 64

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Mitsubishi FR-S500 Instruction Manual Page 63

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