Switching The Motor Power Supply From Drive To Direct-On-Line; Switching The Motor Power Supply From Direct-On-Line To Drive; Protecting The Contacts Of Relay Outputs - ABB ACS580 Series Hardware Manual

124 Guidelines for planning the electrical installation

Switching the motor power supply from drive to direct-on-line

1. Stop the drive and the motor with the drive control panel stop key (drive in
the local control mode) or the external stop signal (drive in the remote control
mode).
2. Open the main contactor of the drive with S11.
3. Switch the motor power supply from the drive to direct-on-line with S40.
4. Wait for 10 seconds to allow the motor magnetization to dissipate.
5. Start the motor with S41.

Switching the motor power supply from direct-on-line to drive

1. Stop the motor with S42.
2. Switch the motor power supply from direct-on-line to the drive with S40.
3. Close the main contactor of the drive with switch S11 (-> turn to position ST
for two seconds and leave to position 1).
4. Start the drive and the motor with the drive control panel start key (drive in
the local control mode) or the external start signal (drive in remote control
mode).

Protecting the contacts of relay outputs

Inductive loads (relays, contactors, motors) cause voltage transients when switched
off.
It is highly recommended that inductive loads are equipped with noise attenuating
circuits (varistors, RC filters [AC] or diodes [DC]) to minimize the EMC emission at
switch-off. If not suppressed, the disturbances can 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 relay outputs.