Earthing And Earth Fault Protection; Running The Motor - Vacon NX_ 0003 5 User Manual

8 • vacon
1.3

Earthing and earth fault protection

The Vacon NX_ AC drive must always be earthed with an earthing conductor connected to the earthing
terminal .
The earth leakage current of Vacon NX_ 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 0.02 in
its total run.
b. Where the protective conductor has a cross-sectional area of less than 0.02 in
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 0.02 in
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:
0.001 in
-
O.01 in
-
The earth fault protection inside the AC drive 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 AC drive, 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
4
WARNING
5
1
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2 if mechanical protection is provided or
2 if mechanical protection is not provided.
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.
SAFETY
2 Cu or 0.02 in 2 Al, through
2 Cu or 0.02 in 2 Al, a
2 Cu or 0.02 in 2 Al.