Leakage Current (>3.5 Ma); Grounding Using Shielded Cable; Motor Connection - GE AF-650 GP Quick Manual

Installation
•
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 the 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 3.5m A.
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-650 GP Quick Guide
Illustration 3.6 Grounding with Shielded Cable

3.4.3 Motor Connection

WARNING
INDUCED VOLTAGE!
Run output motor cables from multiple adjustable
frequency drives separately. Induced voltage from output
2 2
motor cables run together can charge equipment
[10mm ]
capacitors even with the equipment turned off and locked
out. Failure to run output motor cables separately could
result in death or serious injury.
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Illustration 3.7 represents line power input, motor, and
ground grounding for basic adjustable frequency drives.
DET-759A
For maximum wire sizes, see Table 10.1
Comply with local and national electrical codes
for cable sizes.
Motor wiring knockouts or access panels are
provided at the base of IP21 and higher (Nema 1,
12, and 4/4X Indoor) units
Do not install power factor correction capacitors
between the adjustable frequency drive and the
motor
Do not wire a starting or pole-changing device
between the adjustable frequency drive and the
motor.
Connect the 3-phase motor wiring to terminals
96 (U), 97 (V), and 98 (W).
Ground the cable in accordance with grounding
instructions provided.
Torque terminals in accordance with the
information provided in
Follow the motor manufacturer wiring
requirements
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