Toshiba 17-3 – Toshiba VF-SX User Manual
Page 160
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TOSHIBA
17-3
8.
Measuring the input and output voltage with a test instrument during
normal operating conditions can be effective for finding errors, or
spotting a trend toward potential problems. The voltage measured at the
output of the drive may give different values depending on the type of
meter used.
On the input, measure the voltage values between R-S, S-T, and R-T. At
the output, measure the voltage values between U-V, V-W, and U-W.
RECOMMENDED VOLTMETER:
Input — Moving magnet type.
Output — Rectifying AC type
When possible, also measure the ambient temperature at the drive. Keep a record
of all of this data. Significant changes imply that there may be a problem
developing.