Mitsubishi Electric FR-E540 Instruction Manual download pdf (Page 49)

INSTALLATION AND WIRING

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)

Selection the rated sensitivity current for the earth leakage circuit breaker

When using the earth leakage circuit breaker with the inverter circuit, select its rated sensitivity current as

follows, independent of the carrier frequency setting:

• Progressive Super Series (Type SP, CF, SF,

CP)

Rated sensitivity current:

∆

≥

(lg1 + lgn + lg2 + lgm)

• Conventional NV series (Type CA, CS, SS

produced prior to '91)

Rated sensitivity current:

∆

≥

{lg1 + lgn + 3

(lg2+lgm)}

lg1, lg2: leakage currents of cable path

during commercial power supply

operation

lgn* : leakage current of noise filter on

inverter input side

lgm : leakage current of motor during

commercial power supply operation

100

120

23.5

5.5

81422

100

150

Example of leakage current per 1km

for commercial power supply operation

when CV cable is routed in metal conduit

(200V 60Hz)

0.1

1.5 3.7

2.2

7.5 1522

0.2

0.3

0.5

0.7

1.0

2.0

5.5 18.5

Leakage current example

of 3-phase induction motor

during commercial power

supply operation

(200V 60Hz)

Leakage current (mA)

Cable size (mm )

Motor capacity (kW)

Ig1 Ign Ig2 Igm

5.5mm

5m (16.40feet) 5.5mm

70m (16.40feet)

200V 2.2kW (3HP)

Inverter

Noise

filter

Progressive Super

Series

(Type SP, CF, SF, CP)

Conventional NV

(Type CA, CS, SS)

5m (16.40feet)

Leakage current Ig1 (mA) 33

1000m (3280.80feet)

= 0.17

Leakage current Ign (mA) 0 (without noise filter)

70m (229.66feet)

Leakage current Ig2 (mA) 33

1000m (3280.80feet)

= 2.31

Motor leakage current Igm (mA) 0.18

Total leakage current (mA) 2.66 7.64

Note 1. The NV should be installed to the

primary (power supply) side of the

inverter.

2. Ground fault in the secondary side of the

inverter can be detected at the running

frequency of 120Hz or lower.

3. If the

connection neutral point ground

fault in the inverter secondary side.

The protective ground resistance of the

load equipment should be 10

Ω

or less.

Reted sensitivity current (mA)

(

≥

10)

30 100

4. When the breaker is installed on the secondary side of the inverter, it may be unnecessarily

operated by harmonics if the effective value is less than the rating. In this case, do not install it since

the eddy current and hysteresis loss increase and the temperature rises.

* Be careful of the leakage current value of the noise filter installed on the inverter input side.

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Mitsubishi Electric FR-E540 Instruction Manual Page 49

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