Radio-frequency interference 1.4.1 General, Cables

IntelliGear Plus™ Variable Speed MD Gearmotors

1.4- Radio-frequency interference: 1.4.1 - General

Variable speed drives use high-speed switches (transistors, semi-conductors) which switch high voltages (around 660V for 3-phase drives) at high frequencies (several kHz). This provides better efficiency and a low level of motor noise. As a result, they generate radio-frequency signals which may disturb operation of other equipment or distort measurements taken by sensors:

•due to high frequency leakage currents which escape to ground via the stray capacity of the drive/motor cable and that of the motor via the metal structures which support the motor

•by conduction or feedback of R.F. signals on the power supply cable; conducted emissions

•by direct radiation near to the main supply power cable or the drive/motor cable: radiated emissions

These phenomena are of direct interest to the user. The frequency range concerned (radio-frequency) does not affect the energy distribution company.

1.4.2 - Standards (Emission)

The maximum emission level is set by (EN 50081-2) and (EN 50081-1). IntelliGear Plus conforms to:

•EN 50081-2 as standard

•EN 50081-1 with filter option

1.4.3 - Standards (Immunity)

The maximum immunity level is set by (EN 50082-2) and (EN 50082-1). IntelliGear Plus conforms to:

• EN 50082-2 and EN 50082-1 as standard

1.5 - Description of cables and protection devices (Customer Supplied)

NOTICE: When using a circuit-breaker, it must be a motor circuit-breaker (D curve).

•Comply with the size of protection fuses.

•The cable size may vary according to legislation applicable in the country, which will take precedence over the values given in the table below without exception.

Motor	115V Single Phase Power Supply				230V Single Phase Power Supply
HP Rating
HP Rating	IntelliGear	Input Amps	Wire Gauge	Fuse Size	IntelliGear	Input Amps	Wire Gauge	Fuse Size
	Plus Number				Plus Number
0.50	I 310M 050	5	14AWG	10 A	I 31M 050	2.5	14AWG	8A
0.75	I 32M 075	8.5	14AWG	14A	I 31M 075	4	14AWG	8A

1.6 - UL conformity

1.6.1 Special mains supply

The drive can be incorporated in an installation with short circuit capacity of 5000 A rms maximum at voltage 264 VAC rms maximum for 230 V (TL) drives or 528 VAC rms maximum for 400 V (T) drives.

1.6.2 Cables

Only class 1 copper cables 60/70° C (140/167° F) should be used.

1.6.3 Fuses

UL conformity is adhered to if the fuses are UL-listed, fast-blow fuses (class CC up to 30 A) with a rating as indicated in the above table and if the short-circuit symmetrical current does not exceed 5 kA.

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