Measuring The Momentary Voltage Fluctuation Ratio - Okuma VTM-200 Operation & Maintenance Manual

4-3.

Measuring the Momentary Voltage Fluctuation Ratio

Procedure :
1-
Connect an AC voltmeter to the power source terminals at the machine as shown in the illus-
tration.
2-
Measure the voltage while the spindle motor stops and take it as V
3-
Measure the voltage while the spindle motor is decelerating, and take the maximum value as
V .
1
4-
Calculate the momentary voltage fluctuation ratio using the formula shown below.
Momentary voltage fluctuation ratio = (V
Note
1) It is recommended to use an analog voltmeter since the response of a digital voltmeter is
rather slow and its reading is somewhat smaller than the true value.
2) Since measurement is not easy if a deceleration time is short, start spindle deceleration
from a speed as high as possible.
3) Contact us for the instant voltage variation rate, if needed.
SECTION 2 TRANSPORTATION AND INSTALLATION
× 100 (%)
- V ) / V
1 0 0
5699-E P-9
LE11214R0100400080001
.
0