5699-E P-9
SECTION 2 TRANSPORTATION AND INSTALLATION
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.
LE11214R0100400080001
2-
Measure the voltage while the spindle motor stops and take it as V
0
.
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
1
- V
0
) / V
0
×
100 (%)
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.
