GE AF-650 GP Design And Installation Manual page 99

Installation Consideration
Standard Mitigation Strategies:
1. Use an insulated bearing
2. Apply rigorous installation procedures
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3. Lower the IGBT switching frequency
4. Modify the inverter waveform, 60° AVM vs.
SFAVM
5. Install a shaft grounding system or use an
isolating coupling.
6. Apply conductive lubrication
7. Use minimum speed settings, if possible.
8. Try to ensure the line voltage is balanced to
ground. This can be difficult for IT, TT, TN-CS or
Grounded leg systems
9. Use a dU/dt or sinus filter
7-8
AF-650 GP
Ensure the motor and load motor are
aligned
Strictly follow the EMC Installation
guideline
Reinforce the PE so the high frequency
impedance is lower in the PE than the
input power leads.
Provide a good high frequency
connection between the motor and the
adjustable frequency drive for instance
by shielded cable which has a 360°
connection in the motor and the
adjustable frequency drive
Make sure that the impedance from
adjustable frequency drive to building
ground is lower that the grounding
impedance of the machine. This can be
difficult for pumps.
Make a direct ground connection
between the motor and load motor.
TM
Design and Installation Guide
DET-767A