Relay Output Contacts And Inductive Loads - ABB ACS800-07-0610-3 Hardware Manual

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Firmware Manual of the drive for the required parameter settings.) Otherwise, the
contactor will be damaged.
In scalar control, the contactor can be opened with the drive running.

Relay output contacts and inductive loads

Inductive loads (such as relays, contactors, motors) cause voltage transients when
switched off.
The relay contacts of the RMIO board are protected with varistors (250 V) against
overvoltage peaks. In spite of this, 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 the protective components at the terminal block.
230 VAC
230 VAC
Planning the electrical installation
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Varistor
RC filter
Diode
24 VDC
Relay outputs
RO (NC)
RO (C)
RO (NO)
RO (NC)
RO (C)
RO (NO)
RO (NC)
RO (C)
RO (NO)