Leakage Current (>3.5 Ma); Grounding Using Shielded Cable; Motor Connection - GE AF-600 FP Design And Installation Manual
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Installation
•
A dedicated ground wire is required for input
power, motor power and control wiring
•
Do not ground one adjustable frequency drive to
another in a "daisy chain" fashion
•
Using high-strand wire to reduce electrical noise
is recommended.
•
Follow the motor manufacturer wiring
requirements
•
Use the clamps provided with on the equipment
for proper ground connections to obtain a low
HF impedance
•
Keep the ground wire connections as short as
possible to reduce the conductor impedance
2.5.2.1 Leakage Current (>3.5 mA)
Follow national and local codes regarding protective
grounding of equipment with a leakage current > 3.5 mA.
Adjustable frequency drive technology implies high
frequency switching at high power. This will generate a
leakage current in the ground connection. A fault current
in the adjustable frequency 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 adjustable frequency 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 ground wire of at least 0.0155 in
2
mm
]
•
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 (GLCBs), 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
AF-600 FP Design and Installation Guide
2.5.2.2 Grounding Using Shielded Cable
Grounding clamps are provided for motor wiring (see
Figure 2.14).
Figure 2.14 Grounding with Shielded Cable
2.5.3 Motor Connection
WARNING
INDUCED VOLTAGE!
Run output motor cables from multiple adjustable
frequency drives separately. Induced voltage from output
motor cables run together can charge equipment
capacitors even with the equipment turned off and locked
out. Failure to run output motor cables separately could
2
[10
result in death or serious injury.
•
•
•
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DET-768A
Comply with local and national electrical codes
for cable sizes.
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.
Follow the motor manufacturer wiring
requirements
2
2
2-9
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