GE af-600 fp Quick Manual page 8

Installation
•
Keep the ground wire connections as short as
possible
•
Using high-strand wire to reduce electrical noise
is recommended
•
Follow motor manufacturer wiring requirements
3.4.2.1 Leakage Current (>3.5 mA)
Follow national and local codes regarding protective
grounding of equipment with a leakage current > 3.5 mA.
Drive technology implies high frequency switching at high
power. This will generate a leakage current in the ground
connection. A fault current in the drive at the output
power terminals might contain a DC component which can
charge the filter capacitors and cause a transient ground
current. The ground leakage current depends on various
system configurations including RFI filtering, shielded
motor cables, and drive power.
EN/IEC61800-5-1 (Power Drive System Product Standard)
requires special care if the leakage current exceeds 3.5 mA.
Grounding must be reinforced in one of the following
ways:
•
Ground wire of at least 0.0155 in
•
Two separate ground wires both complying with
the dimensioning rules
See EN 60364-5-54 § 543.7 for further information.
Using RCDs
Where residual current devices (RCDs), also known as
ground leakage circuit breakers (ELCBs), are used, comply
with the following:
Use RCDs of type B only which are capable of
detecting AC and DC currents
Use RCDs with an inrush delay to prevent faults
due to transient ground currents
Dimension RCDs according to the system configu-
ration and environmental considerations
3.4.2.2 Grounding Using Shielded Cable
Grounding clamps are provided for motor wiring (see
Illustration 3.6).
AF-600 FP Quick Guide
Illustration 3.6 Grounding with Shielded Cable
3.4.2.3 Grounding Using Conduit
CAUTION
2 2
[10 mm ]
GROUNDING HAZARD!
Do not use conduit connected to the drive as a
replacement for proper grounding. Ground currents are
higher than 3.5mA. Improper grounding can result in
personal injury or electrical shorts.
Dedicated grounding clamps are provided (See
Illustration 3.7).
Illustration 3.7 Grounding with Conduit
DET-759A
3 3
7