Mitsubishi FR - S500 instruction manual Grounding precautions, Noise reduction examples, Blf, Bif

Noise reduction examples

FR-BLF

Control

Reduce carrier

FR-BLF

Install filter FR-BSF01

box

frequency.

Install filter

FR-BSF01

on inverter's input side.

on inverter's output side.

Inverter

FR-

FR-

Inverter

IM Motor

BLF

BLF

power supply

Install filter FR-BIF

FR-

Use 4-core cable for motor

on inverter's input side.

Separate inverter and power

BIF

power cable and use one

cable as earth cable.

line more than 30cm (3.94inches)

(at least 10cm (11.81inches))

Use twisted pair shielded cable.

from sensor circuit.

Power

Sensor

Control

supply

power supply Do not earth control

for sensor

box directly.

Do not earth shield but connect

Do not earth

it to signal common cable.

control cable.

1.5.8 Grounding precautions

Leakage currents flow in the inverter. To prevent an electric shock, the inverter and motor must be grounded.

Use the dedicated ground terminal to ground the inverter. (Do not use the screw in the casing, chassis, etc.)

Use a tinned* crimping terminal to connect the earth cable. When tightening the screw, be careful not to break the threads.

*Plating should not include zinc.

Use the thickest possible ground cable. Use the cable whose size is equal to or

greater than that indicated in the following table, and minimize the cable length. 1 The grounding point should be as near as possible to the inverter.

		(Unit: mm2)
Motor Capacity	Ground Cable Size
	200V, 100V class	400V class
2.2kW (3HP) or less	2 (2.5)	2 (2.5)
3.7kW (5HP)	3.5 (4)	2 (4)

For use as a product compliant with the Low Voltage Directive, use PVC cable whose size is indicated within parentheses.

Ground the motor on the inverter side using one cable of the 4-core cable.

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