Earthing And Earth Fault Protection; Running The Motor - Honeywell NX series User Manual

1.3

Earthing and earth fault protection

The NX frequency converter must always be earthed with an earthing conductor connected to the earthing
terminal .
The earth leakage current of NX frequency converters exceeds 3.5mA AC. According to EN61800-5-1, one
or more of the following conditions for the associated protective circuit shall be satisfied:
a. The protective conductor shall have a cross-sectional area of at least 10 mm
its total run.
b. Where the protective conductor has a cross-sectional area of less than 10 mm
second protective conductor of at least the same cross-sectional area shall be provided up to a point
where the protective conductor has a cross-sectional area not less than 10 mm
c. Automatic disconnection of the supply in case of loss of continuity of the protective conductor. See chapter 6.
The cross-sectional area of every protective earthing conductor which does not form part of the supply
cable or cable enclosure shall, in any case, be not less than:
a. 2,5mm2 if mechanical protection is provided or
b. 4mm2 if mechanical protection is not provided.
The earth fault protection inside the frequency converter protects only the converter itself against earth
faults in the motor or the motor cable. It is not intended for personal safety.
Due to the high capacitive currents present in the frequency converter, fault current protective switches
may not function properly.
1.4

Running the motor

Warning symbols
For your own safety, please pay special attention to the instructions marked with the following symbols:
= Dangerous voltage
= General warning
WARNING
= Hot surface – Risk of burn
HOT SURFACE
MOTOR RUN CHECK LIST
1
2
3
WARNING
4
5
SAFETY
Before starting the motor, check that the motor is mounted properly and
ensure that the machine connected to the motor allows the motor to be
started.
Set the maximum motor speed (frequency) according to the motor and
the machine connected to it.
Before reversing the motor make sure that this can be done safely.
Make sure that no power correction capacitors are connected to the
motor cable.
Make sure that the motor terminals are not connected to mains potential.
7(110)
2 2
Cu or 16 mm Al, through
2 2
Cu or 16 mm Al, a
2 2
Cu or 16 mm Al.
1