WARNING!
If vector motor control mode is in use, do not open the output contactor while the
drive controls the motor. The motor control operates faster than the contactor, and
tries to maintain the load current. This can cause damage to the contactor.
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. It
is highly recommended that inductive loads are equipped 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 relay outputs.
2
3
4
230 V AC
230 V AC
+ 24 V DC
1
Relay output1
Varistor2
RC filter3
Diode4
50 Guidelines for planning the electrical installation
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