Installing and Wiring Option Cards
2-
41
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.
Some examples of PG output frequency (number of pulses) for the maximum frequency output are shown in
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.)
Fig 2.26 PG-B2 Connection Example
Table 2.21 PG Pulse Selection Examples
Motor's Maximum Speed (RPM)
PG Rating
(ppr)
PG Output Frequency for Maximum
Frequency Output (Hz)
1800
600
18,000
1500
800
20,000
1200
1000
20,000
900
1200
18,000
Motor speed at maximum frequency output (RPM)
60
PG rating (ppr)
PG power supply
Capacitor for momentary
power loss
Signals
f
PG
(Hz) =
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