Chapter 3: Wiring
Firmware – S1043
Revision: 2 (9/98)
51
© Saftronics, Inc.
3.7.5
Selecting the Number of PG Pulses
§
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 (r/min)
60
X PG rating (p/rev) = 20,000 Hz
Some examples of PG output frequency (number of pulses) for the maximum frequency output are shown in
Table
3.17.
Table 3.17
PG Pulse Selection Examples
Motor’s Maximum Speed (r/min)
PG Rating (p/rev)
PG Output Frequency for Maximum
Frequency Output (Hz)
1800
600
18,000
1500
800
20,000
1200
1000
20,000
900
1200
18,000
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.)
Figure 3.33
PG-B2 Connection Example
§
PG-D2/PG-X2
The maximum response frequency is 300 kHz.
Use the following equation to compute the output frequency of the PG (fPG):
Motor speed at maximum frequency output (r/min)
f
PG
(
Hz) =
60
X PG rating (p/rev)
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.)
