Mitsubishi Electronics FR-S500 Leakage current Ig1 mA, Leakage current Ign mA, Motor leakage

Main circuit terminals

(3) Selecting 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, independently of the PWM carrier frequency:

•Breaker for harmonic and surge

Rated sensitivity current:		Example of leakage					Leakage current
I∆n ≥ 10 × (lg1+Ign+lg2+lgm)		current per 1km in cable					example of three-phase
		path during commercial					induction motor
• Standard breaker
		power supply operation					during commercial
Rated sensitivity current:
		when the CV cable is					power supply
I∆n ≥ 10 × {lg1+lgn+3 × (lg2+lgm)}		routed in metal conduit					operation
lg1, lg2 : Leakage currents of cable		(200V 60Hz)					(200V 60Hz)
	path during commercial						2.0
	power supply operation	(mA)	120			(mA)
lgn*	: Leakage current of noise		100				1.0
		current	80			current	0.7
lgm	: Leakage current of motor
			40
	filter on inverter input side		60				0.5
	during commercial power					Leakage	0.3
		Leakage	20				0.2
	supply operation
			0				0.1
				2 3.5	8 142238 80150			3.7 7.5 15223755
* Note the leakage current value of the							1.5
				5.5 3060100			2.2 5.51118.53045
noise filter installed on the inverter				Cable size (mm)2			Motor capacity (kW)
input side.
<Example>
	2mm2 ×5m		2mm2 ×70m

NV	Noise
	filter
	Inver-
	ter

Ig1 Ign Ig2

3

IM 200V 1.5kW

Igm

	Breaker for harmonic and		Standard breaker
	surge
Leakage current (Ig1) (mA)	20 ×	5m		= 0.10
		1000m
Leakage current (Ign) (mA)		0 (without noise filter)
Leakage current (Ig2) (mA)	20 ×	70m		= 1.40
		1000m
Motor leakage		0.16
current (Igm) (mA)
Total leakage current (mA)	1.66		4.78
Rated sensitivity current	30		100
(mA) (≥ Ig × 10)

14