Revision history – Yaskawa 1000 Hz High Frequency User Manual
Page 17
6 Application Notes
YASKAWA ELECTRIC EZZ020793 1000 Hz High Frequency Custom Software Supplement
17
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Precautions for High Frequency/Low Impedance Motors
High frequency motors exhibit different characteristics than standard 60/120 Hz maximum
frequency motors. The low impedance associated with these high frequency motors often
requires manually programming a custom V/f pattern into the E1 parameter group to obtain
proper performance and rated power from the drive-motor combination.
The low impedance may also cause excessive motor current. In addition to considering the
use of an output reactor, it may be advantageous to oversize the drive to accommodate the
high peak current that may result from the low impedance motor. Using a drive that is at
least one or two models larger than the motor FLA may also help eliminate the oL2 faults.
Compatibility between the drive, motor, and the reactor is best accomplished via testing and
observation of the motor current waveform with an oscilloscope.
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Revision History
The revision dates and the numbers of the revised manuals appear on the bottom of the back
cover.
Revision No.
Publication Date
Software No.
Revised Content
First Version
2007.11.09
VSV905030
-
<1>
2008.03.06
VSV905030
Cover addition
<2>
2008.05.06
VSV905030
English addition
<3>
2008.06.03
VSV905030
YEA revision, changed document number
MANUAL NO.
ޓTOBP C730600 28A
Published in Japan May 2008 07-12
Date of
publication
Date of original
publication
Revision number
1