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Continuous motor cable shield or enclosure for equipment in 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 drive and input power cable in short-circuits
Protect the drive with fuses (a) and the input cable with fuses (b) as shown below:
b
Size the fuses or the circuit breaker at the distribution board according to local regulations
for the input cable protection. Select the fuses for the drive according to the instructions
given in chapter
Technical
damage and prevent damage to adjoining equipment in case of a short-circuit inside the
drive.
Note 1: If the fuses for the drive protection are placed at the distribution board and the
input cable is dimensioned according to the nominal input current of the drive given in the
rating table on page 115, the fuses will protect also the input cable in short-circuit
situations, restrict drive damage and prevent damage to adjoining equipment in case of a
short-circuit inside the drive. No separate fuses for the input cable protection are needed.
Note 2: Circuit breakers must not be used without fuses. For more information, contact
ABB.
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 dimensioned according to the nominal current of the drive. No additional
protection devices are needed.
Guidelines for planning the electrical installation 61
ACS530-04
a
~
~
data. The fuses for the drive protection will restrict drive
M
3~
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