Protecting The Contacts Of Relay Outputs - ABB ACS150 series User Manual
0.37...4kw;
0.5...5 hp
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Also See for ACS150 series:
- User manual (156 pages) ,
- Installation instructions (4 pages) ,
- Quick installation and start-up manual (2 pages)
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Protecting the contacts of relay outputs
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.
Varistor
230 V AC
RC filter
230 V AC
Diode
24 V DC
Drive
relay
output
Drive
relay
output
Drive
relay
output
Planning the electrical installation
37
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