Toshiba Single-phase 200V class 0.2 to 2.2kW Disposal, What to do about leak current

E6581090

Circuit interrupting when two or more inverters are used on the same power line.

	(circuit
MCCB1	MCCB2 interrupting fuse)
	MCCB3
	MCCBn＋1

INV1

INV2

INVn

1

Breaking of selected inverter

There is no fuse in the inverter's main circuit. Thus, as the diagram above shows, when more than one inverter is used on the same power line, you must select interupting characteristics so that only the MCCB2 will trip and the MCCB1 will not trip when a short occurs in the inverter (INV1). When you cannot select the proper characteristics install a circuit interrupting fuse between the MCCB2 and the INV1.

■Disposal

If an inverter is no longer usable, dispose of it as industrial waste.

1.4.3What to do about leak current

Warning

Current may leak through the inverter's input/output wires because of insufficient electrostatic capacity on the motor with bad effects on peripheral equipment. The leak current's value is affected by the carrier frequency and the length of the input/output wires. Test and adopt the following remedies against leak current.

(1) Leakage current from the inverter main unit

As compared with other types of inverters, a large amount of current leaks from your inverter when it is used in delta connection (with one phase grounded). Take this into consideration when selecting an earth leakage breaker.

<Leakage current in delta connection (one phase grounded)> (For reference only)

VFNC1-2001P to 2022P		: About 1mA
VFNC1S-2002P	to 2007P	: About 6mA
VFNC1S-1001P	to 1007P	: About 3mA
VFNC1S-2002PL to 2007PL		: About 11mA
VFNC1S-2015P	to 2022P	: About 3mA
VFNC1S-2015PL to 2022PL		: About 17mA

(2) Effects of leakage current across ground

Leakage current may flow not just through the inverter system but also through ground wires to other systems. Leakage current will cause earth leakage breakers, leak current relays, ground relays, fire alarms and sensors to operate improperly, and it will cause superimposed noise on the CRT screen or display of incorrect current amounts during current detection with the CT.

Power supply

ELCB

ELCB

Inverter M

Inverter M

Leakage current path across ground

A-11