Planning the electrical installation 67
An example bypass connection is shown below.
WARNING! Never connect the supply power to the drive output terminals U2, V2
and W2. Line voltage applied to the output can result in permanent damage to the
unit.
Protecting the contacts of relay outputs
Inductive loads (relays, contactors, motors) cause voltage transients when switched off.
The relay contacts on the JCU Control Unit 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.
Switch Description
S11 Drive main
contactor on/off
control
S40 Motor power
supply selection
(drive or direct on
line)
S41 Start when motor
is connected on
line
S42 Stop when motor
is connected
direct on line
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