ACS550-02/U2 User’s Manual 25
Planning the electrical installation
Protecting the relay output contacts and attenuating disturbances in case
of inductive loads
Inductive loads (relays, contactors, motors) cause voltage transients when switched
off.
It is highly recommended to 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 control board terminal block.
19 X1C-1
20 X1C-2
21 X1C-3
22 X1D-1
23 X1D-2
24 X1D-3
25 X1E-1
26 X1E-2
27 X1E-3
Diode
Varistor
RC filter
Digital outputs
X1
230 V AC
230 V AC
24 V DC
K3
K2
K1
Control
board
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