Electrical Installation 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 Board being used. Set the correct number
for your model.
PG-A2/PG-B2
The maximum response frequency is 32,767Hz.
Use a PG that outputs a maximum frequency of approximately 20kHz 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 2.24.
A separate power supply is required if the PG power supply capacity is greater than 200mA. (If momentary power loss must
be handled, use a backup capacitor or other method). See Fig 2.24.
Fig 2.24 PG-B2 Connection Example For External +12Vdc PG Power Supply
Table 2.24 PG Pulse Selection Examples
Motor's Maximum Speed (RPM) PG Rating (PPR) PG Output Frequency (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)f
PG
(Hz) =
1
2
3
4
5
6
TA1
TA3
+12Vdc
0Vdc
+
+
_
_
0Vdc
+
+
_
_
0Vdc
+12Vdc
+
_
PG power supply
PG
Signals
PG
Capacitor for
momentary power loss
AC
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