Selecting The Number Of Pg (Encoder) Pulses - YASKAWA G7 Series Technical Manual

Selecting the Number of PG (Encoder) Pulses

The setting for the number of PG pulses depends on the model of PG Speed Control Card being used. Set the
correct number for your model.
PG-A2/PG-B2
The maximum response frequency is 32,767 Hz.
Use a PG that outputs a maximum frequency of approximately 20 kHz for the rotational speed of the motor.
Motor speed at maximum frequency output (RPM)
f (Hz) =
PG
Some examples of PG output frequency (number of pulses) for the maximum frequency output are shown in
Table 2.21.
Motor's Maximum Speed (RPM)
1800
1500
1200
900
Note 1. The motor speed at maximum frequency output is expressed as the sync rotation speed.
2. The PG power supply is 12 Vdc.
3. A separate power supply is required if the PG power supply capacity is greater than 200 mA. (If momentary power loss must be handled, use a
backup capacitor or other method.)
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Table 2.21 PG Pulse Selection Examples
PG Rating
(ppr)
600
800
1000
1200
PG power supply
Capacitor for momentary
power loss
Fig 2.26 PG-B2 Connection Example
Installing and Wiring Option Cards
× PG rating (ppr)
PG Output Frequency for Maximum
Frequency Output (Hz)
18,000
20,000
20,000
18,000
Signals
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