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7.7 Motor
Bearing
Currents
All motors installed with 150 hp or higher power drives
should have NDE (Non-Drive End) insulated bearings
installed to eliminate circulating bearing currents. To
minimize DE (Drive End) bearing and shaft currents proper
grounding of the drive, motor, driven machine, and motor
to the driven machine is required.
Standard Mitigation Strategies:
1.
Use an insulated bearing
2.
Apply rigorous installation procedures
-
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.
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
Installation Consideration
AF-600 FP Design and Installation Guide
DET-768A
7-9
7
7
Summary of Contents for AF-600 FP Series
Page 1: ...AF 600 FPTM Fan Pump Drive Design and Installation Guide GE ...
Page 17: ...Introduction AF 600 FP Design and Installation Guide 1 10 DET 768A 1 1 ...
Page 39: ...Start Up and Functional Tes AF 600 FP Design and Installation Guide 3 6 DET 768A 3 3 ...
Page 57: ...About Programming AF 600 FP Design and Installation Guide 5 14 DET 768A 5 5 ...
Page 73: ...Application Set up Examples AF 600 FP Design and Installation Guide 6 16 DET 768A 6 6 ...
Page 83: ...Installation Consideration AF 600 FP Design and Installation Guide 7 10 DET 768A 7 7 ...
Page 87: ...Status Messages AF 600 FP Design and Installation Guide 8 4 DET 768A 8 8 ...
Page 97: ...Warnings and Alarms AF 600 FP Design and Installation Guide 9 10 DET 768A 9 9 ...
Page 101: ...Basic Troubleshooting AF 600 FP Design and Installation Guide 10 4 DET 768A 10 0 ...
Page 103: ...Terminal and Applicable Wir AF 600 FP Design and Installation Guide 11 2 DET 768A 11 1 ...