2-48
Note 6. Tighten
the screws to a tightening torque of 0.5
to 0.6 N
m. The terminal block may be dam
-
aged
if the tightening torque is too
strong, and malfunctions and short-circuits may result if the
tightening torque is too weak.
H Selecting the Number of PG (Encoder) Pulses
D 3G3FV-PPGA2/-PPGB2
• The maximum response frequency is 30 kHz.
• Taking
into consideration the encoder pulse deviation (phase dif
ference: 90
±45°
) and the waveform
when
the cable is long, select
a smaller number of pulses than the ones shown in the following table.
Motor’s maximum speed (r/min) 1,800 1,500 900
Number of encoder pulses (p/r) 500 600 1,00
Maximum encoder frequency (kHz) 15 15 15
D 3G3FV-PPGD2/-PPGX2
• The maximum response frequency is 300 kHz.
• When
the encoder pulse deviation (phase dif
ference: 90
±45°
) is taken into consideration, the number
of encoder pulses can be calculated by means of the following formula:
Number of encoder pulses [p/r]
60 x maximum response frequency (300,000 Hz)
2 x motor’s maximum rotation speed (r/min)
x
• If the motor’s maximum speed is less than 4,000 r/min, an encoder of 1,000 to 2,000 p/r is recom-
mended. Even if an encoder with higher than required resolution is selected, it will not improve the
speed control range or precision.
Installation Chapter
2
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