Mitsubishi FR - S500 Regarding noise and the installation of a noise filter, Nfb Fr-Bal

1.5.6 Regarding the installation of the power factor improving reactor

When the inverter is installed near a large-capacity power transformer (500kVA or more at the wiring length of 10m (32.81feet) or less) or the power capacitor is to be switched, an excessive peak current will flow in the power supply input circuit, damaging the converter circuit. In such a case, always install the power factor improving reactor (FR-BEL or FR-BAL).

	NFB	FR-BAL		Inverter
		R	X
Power				R<L1>U
		S	Y
				S<N> V
supply
		T	Z	T	W

P<+>P1

FR-BEL(*)

Power supply equipment

	1500	Power factor
	1000	improving reactor
(kVA)		installation range
	500

capacity
	0	10

Wiring length (m)

REMARKS

*When connecting the FR-BEL, remove the jumper across terminals P<+>-P1. The wiring length between FR-BEL and inverter should be 5m (16.40feet) maximum and as short as possible.

Use the cables which are equal in size to those of the main circuit. (Refer to page 11)

1.5.7 Regarding noise and the installation of a noise filter

Some noise enters the inverter causing it to malfunction and others are generated by the inverter causing the malfunction of peripheral devices. Though the inverter is designed to be insusceptible to noise, it handles low-level signals, so it requires the following general counter measures to be taken.

General counter measures

Do not run the power cables (I/O cables) and signal cables of the inverter in parallel with each other and do not bundle them.

Use twisted shield cables for the detector connecting and control signal cables and connect the sheathes of the shield cables to terminal SD.

Ground the inverter, motor, etc. at one point.

Capacitances exist between the inverter's I/O wiring, other cables, earth and motor, through which leakage currents flow to cause the earth leakage circuit breaker, earth leakage relay and external thermal relay to operate unnecessarily. To prevent this, take appropriate measures, e.g. set the carrier frequency in Pr. 72 to a low value, use an earth leakage circuit breaker designed for suppression of harmonics and surges, and use the electronic overcurrent protection built in the inverter.

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