Protecting The Contacts Of Relay Outputs - ABB ACS280 Hardware Manual

When you select the vector motor control mode and the motor coast stop mode,
you can open the contactor immediately after the drive has received the stop
command. This is the case also if you use the scalar motor control mode.

Protecting the contacts of relay outputs

Inductive loads (relays, contactors, motors) cause voltage transients when switched
off.
Install the protective component as close to the inductive load as possible. Do not
install protective components at the relay outputs.
1 Relay output
2 Varistor
3 RC filter
4 Diode
Guidelines for planning the electrical installation 53
230 V AC
1
230 V AC
+ 24 V DC
2
3
4