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Planning electrical installation

Protecting the relay output contact and attenuating disturbances in case

of inductive loads

Inductive loads (relays, contactors, motors) cause voltage transients when switched

off.

Equip inductive loads with noise attenuating circuits [varistors, RC filters (AC) or

diodes (DC)] in order to minimize the EMC emission at switch-off. If not suppressed,

the disturbances may connect capacitively or inductively to other conductors in the

control cable and form a risk of malfunction in other parts of the system.

Install the protective component as close to the inductive load as possible. Do not

install protective components at the I/O terminal block.

Residual current device (RCD) compatibility

ACS150-01x drives are suitable to be used with residual current devices of Type A,

ACS150-03x drives with residual current devices of Type B. For ACS150-03x drives,

other measures for protection in case of direct or indirect contact, such as separation

from the environment by double or reinforced insulation or isolation from the supply

system by a transformer, can also be applied.

Selecting the control cables

The analog control cable (if analog input AI is used) and the cable used for the

frequency input must be shielded.

Use a double-shielded twisted pair cable (Figure a, e.g. JAMAK by Draka NK

Cables) for the analog signal.

24 VDC

230 VAC

Diode

Varistor

RC filter

Drive

relay

output

Drive

relay

output

Drive

relay

output

ABB ACS150 User Manual

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