Omron VARISPEED G7 -, Instruction Manual

Page: 70 / 417

Installing and Wiring Option Cards
2-
37
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
Table 2.21 .
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.)
Fig 2.29 PG-B2 Connection Example
Table 2.21 PG Pulse Selection Examples
Motor's Maximum Speed (min
−
1
)
PG Rating
(p/rev)
PG Output Frequency for Maximum Fre-
quency Output (Hz)
1800 600 18,000
1500 800 20,000
1200 1000 20,000
900 1200 18,000
Motor speed at maximum frequency output (min
−
1
)
60
×
PG rating (p/rev) = 20,000 Hz
PG power supply
Capacitor for momentary
power loss
Signals