Planning the electrical installation
71
Before opening an output contactor (in DTC motor control mode)
Stop the drive and wait for the motor to stop before opening a contactor between the
output of the drive and the motor when the DTC control mode is selected. (See the
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.
24 VDC
230 VAC
230 VAC
Varistor
RC filter
Diode
RO (NC)
RO (C)
RO (NO)
RO (NC)
RO (C)
RO (NO)
RO (NC)
RO (C)
RO (NO)
Relay outputs
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