Earth (Grounding) Requirements; Leakage Current (>3,5Ma) - GE AF-600 FP Operating Instructions Manual

Installation

2.4.2 Earth (Grounding) Requirements

WARNING
GROUNDING HAZARD!
For operator safety, it is important to ground drive
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properly in accordance with national and local electrical
codes as well as instructions contained within these
instructions. Ground currents are higher than 3,5mA.
Failure to ground drive properly could result in death or
serious injury.
NOTE
It is the responsibility of the user or certified electrical
installer to ensure correct grounding (earthing) of the
equipment in accordance with national and local electrical
codes and standards.
•
Follow all local and national electrical codes to
ground electrical equipment properly
•
Proper protective grounding for equipment with
ground currents higher than 3,5mA must be
established, see Leakage Current (>3,5mA)
•
A dedicatedground wire is required for input
power, motor power and control wiring
•
Use the clamps provided with on the equipment
for proper ground connections
•
Do not ground one drive to another in a "daisy
chain" fashion
•
Keep the ground wire connections as short as
possible
•
Use of high-strand wire to reduce electrical noise
is recommended
•
Follow motor manufacturer wiring requirements
2.4.2.1 Leakage Current (>3,5mA)
Follow national and local codes regarding protective
earthing of equipment with a leakage current > 3,5mA.
Drive technology implies high frequency switching at high
power. This will generate a leakage current in the earth
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 earth
current. The earth leakage current depends on various
system configurations including RFI filtering, screened
motor cables, and drive power.
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AF-600 FP Operating Instructions
EN/IEC61800-5-1 (Power Drive System Product Standard)
requires special care if the leakage current exceeds 3,5mA.
Earth grounding must be reinforced in one of the
following ways:
•
•
See EN 60364-5-54 § 543.7 for further information.
Using RCDs
Where residual current devices (RCDs), also known as earth
leakage circuit breakers (ELCBs), are used, comply with the
following:
Earth ground wire of at least 10mm
Two separate earth ground wires both complying
with the dimensioning rules
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 earth currents
Dimension RCDs according to the system configu-
ration and environmental considerations
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