￭ Separate control cable ducts
Lead 24 V and 230 V (120 V) control cables in separate ducts unless the 24 V cable is
insulated for 230 V (120 V) or insulated with an insulation sleeving for 230 V (120 V).
￭ Continuous motor cable shield 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:
• European Union: Install the equipment in a metal enclosure with 360 degree grounding
for the shields of both the incoming and outgoing cable, or connect the shields of the
cables otherwise together.
• US: Install the equipment in a metal enclosure in a way that the conduit or motor cable
shielding runs consistently without breaks from the drive to the motor.
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.
WARNING!
If the drive is connected to multiple motors, use a separate circuit breaker or fuses
for protecting each motor cable and motor against overload. The drive overload
protection is tuned for the total motor load. It may not trip due to an overload in
one motor circuit only.
76 Guidelines for planning the electrical installation
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