ABB ACH550-02-645A-4 [42/454] Protecting the relay output contacts and attenuating disturbances in case of inductive loads

ABB ACH550-02-645A-4 [42/454] Protecting the relay output contacts and attenuating disturbances in case of inductive loads
38 Preparing for installation
ACH550-02 User’s Manual
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 minimise 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
20
21
22
23
24
25
26
27
X1
K1
K2
K3
Control
board
Digital outputs
Varistor
RC filter
Diode
230 V AC
230 V AC
24 V DC

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