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

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Selecting the Number of PG (Encoder) Pulses

The setting for the number of PG pulses depends on the model of PG Speed Control Board 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.
Some examples of PG output frequency (number of pulses) for the maximum frequency output are shown in
Table 2.21.
Motor's Maximum Speed (min
Note 1. The motor speed at maximum frequency output is expressed as the sync rotation speed.
2. The PG power supply is 12 V.
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.)
-46
2
Motor speed at maximum frequency output (min
60
Table 2.21 PG Pulse Selection Examples
−1
)
1800
1500
1200
900
Fig 2.30 PG-B2 Connection Example
−1
)
× PG rating (p/rev) = 20,000 Hz
PG Rating PG Output Frequency for Maximum
(p/rev)
600
600
900
1200
PG power supply
Capacitor for momentary
power loss
Signals
Frequency Output (Hz)
18,000
15,000
18,000
18,000