6-16
Table 6.6 lists the relationship between the rated leakage current sensitivity of ELCBs (with
overcurrent protection) and wiring length of the inverter output circuits. Note that the sensitivity levels
listed in the table are estimated values based on the results obtained by the test setup in the Fuji
laboratory where each inverter drives a single motor.
Table 6.6 Rated Current Sensitivity of Earth Leakage Circuit Breakers (ELCBs)
0.1 1/8
0.2 1/4
0.4 1/2
0.75 1
1.5 2 30 mA 200 mA
2.2 3
3.7 5
5.5 7.5
7.5 10
11 15
15 20
0.4 1/2
0.75 1
1.5 2
2.2 3 200 mA 500 mA
3.7, 4.0 5
5.5 7.5
7.5 10
11 15
15 20
0.1 1/8
0.2 1/4
0.4 1/2 30 mA 200 mA
0.75 1
1.5 2
2.2 3
0.1 1/8
0.2 1/4
0.4 1/2 30 mA 200 mA
0.75 1
100 mA
Single-
phase
100V
Three-
phase
200V
Three-
phase
400V
Single-
phase
200V
100 mA
100 mA
30 mA 100 mA
Power
supply
voltage
Applicable
motor
rating (kW) 10 m 30 m
Wiring length and current sensitivity
50 m 100 m 200 m 300 m
Applicable
motor
rating (HP)
- Values listed above were obtained using Fuji ELCB EG or SG series applied to the test setup.
- The rated current of applicable motor rating indicates values for Fuji standard motor (4 poles, 50 Hz and
200 V 3-phase).
- The leakage current is calculated based on grounding of the single wire for 200V Δ type and the neutral
wire for 400V Y type power lines.
- Values listed above are calculated based on the static capacitance to the earth when the 600V class of
vinyl-insulated IV wires are used in a metal conduit laid directly on the earth.
- Wiring length is the total length of wiring between the inverter and motor. If more than one motor is to
be connected to a single inverter, the wiring length should be the total length of wiring between the
inverter and motors.
To Next Page
Loading...
