Mitsubishi Electric F700 Instruction Manual download pdf (Page 21)

Wiring

(2) Notes on earthing (grounding)

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

This inverter must be earthed (grounded). Earthing (Grounding) must conform to the requirements of national and local

safety regulations and electrical codes. (JIS, NEC section 250, IEC 536 class 1 and other applicable standards)

• Use the dedicated earth (ground) terminal to earth (ground) the inverter.

(Do not use the screw in the casing, chassis, etc.)

• Use the thickest possible

earth (ground)

cable. Use the cable whose size is equal to or greater than that indicated in

the above table, and minimize the cable length. The earthing (grounding) point should be as near as possible to the

inverter.

To be compliant with the European Directive (Low Voltage Directive), earth (ground) the inverter

according to the instructions on page 137.

(3) Total wiring length

The overall wiring length for connection of a single motor or multiple motors should be within the value in the table below.

* For the 75K or more, the setting range of Pr. 72 PWM frequency selection is "0 to 6".

When driving a 400V class motor by the inverter, surge voltages attributable to the wiring constants may occur at

the motor terminals, deteriorating the insulation of the motor.

Take the following measures (1) or (2) in this case.

(1) Use a "400V class inverter-driven insulation-enhanced motor" and set frequency in Pr. 72 PWM frequency

selection according to wiring length

(2) Connect the surge voltage suppression filter (FR-ASF-H) to the 55K or less and the sine wave filter (MT-BSL/

BSC) to the 75K or more on the inverter output side.

(4) Cable size of the control circuit power supply (terminal R1/L11, S1/L21)

· Terminal Screw Size: M4

· Cable size: 0.75mm

to 2mm

· Tightening torque: 1.5N·m

Pr. 72 PWM frequency selection setting

(carrier frequency)

0.75K 1.5K 2.2K or more

2 (2kHz) or less 300m 500m 500m

3 to 15 (3kHz to 14.5kHz) * 200m 300m 500m

Total wiring length (1.5K or more)

CAUTION

· Especially for long-distance wiring, the inverter may be affected by a charging current caused by the stray capacitances of the

wiring, leading to a malfunction of the overcurrent protective function or fast response current limit function or a malfunction or

fault of the equipment connected on the inverter output side. If fast-response current limit function malfunctions, disable this

function. (For Pr.156 Stall prevention operation selection, refer to the Instruction Manual (applied).)

· For details of Pr. 72 PWM frequency selection , refer to the Instruction Manual (applied).

For explanation of surge voltage suppression filter (FR-ASF-H) and sine wave filter (MT-BSL/BSC), refer to the manual of

each option.

500m or less

300m

300m + 300m = 600m

Wiring Length

50m or less 50m to 100m exceeding 100m

Pr. 72 PWM frequency selection setting

(carrier frequency)

14.5kHz or less 9kHz or less 4kHz or less

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Mitsubishi Electric F700 Instruction Manual Page 21

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