Planning the electrical installation
75
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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