￭ Continuous motor cable shield/conduit or enclosure for equipment
on the motor cable
To minimize the emission level when safety switches, contactors, connection boxes or
similar equipment are installed on the motor cable between the drive and the motor:
• Install the equipment in a metal enclosure.
• Use either a symmetrical shielded cable, or install the cabling in a metal conduit.
• Make sure that there is a good and continuous galvanic connection in the shield/conduit
between drive and motor.
• Connect the shield/conduit to the protective ground terminal of the drive and the motor.
￭ Separate control cable ducts
Lead 24 V DC and 230 V AC (120 V AC) control cables in separate ducts unless the 24 V DC
cable is insulated for 230 V AC (120 V AC) or insulated with an insulation sleeving for
230 V AC (120 V AC).
24 V DC
230 V AC
(120 V AC)
230 V AC
(120 V AC)
24 V DC
Implementing thermal overload and short-circuit protection
￭ Protecting the input cabling and the drive upon a short-circuit
To protect the input cabling in short-circuit situations, install fuses or a suitable circuit breaker
at the supply side of the cabling.
The drive is equipped with internal AC fuses as standard. In case of a short-circuit inside
the drive, the AC fuses protect the drive, restrict drive damage, and prevent damage to
adjoining equipment.
￭ Protecting the motor and motor cable in short-circuits
The drive protects the motor cable and motor in a short-circuit situation when the motor
cable is sized according to the nominal current of the drive. No additional protection devices
are needed.
￭ Protecting the drive and the power cables against thermal overload
The drive protects itself and the input and motor cables against thermal overload when the
cables are sized according to the nominal current of the drive. No additional thermal protection
devices are needed.
Guidelines for planning the electrical installation 77
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