Fuji Electric FRENIC-Ace series - Page 402

5.3 Description of Function Codes
5-232
■ Feedback Input, Pulse scaling factor 1 (d16) and Pulse scaling factor 2 (d17)
d16 and d17 specify the factors to convert the speed feedback input pulse rate into the motor shaft speed (min
-1
).
• Data setting range:1 to 9999
Specify the data according to the transmission ratios of the pulley and gear train as shown below.
Figure 5.3-22 An Example of a Closed Loop Speed Control System (Conveyor)
Listed below are expressions for conversion between the speed feedback input pulse rate and the motor shaft
speed.
Motor shaft speed =
Pulse scaling factor 2 (d17)
Pulse scaling factor 1 (d16)
× Encoder shaft speed
Pulse scaling factor 2 (d17)
Pulse scaling factor 1 (d16)
=
b
a
×
d
c
Pulse scaling factor 1 (d16) = a × c
Pulse scaling factor 2 (d17) = b × d
When driving the motor under the vector control with speed sensor, mount the sensor encoder to the
motor shaft directly, or
to a shaft with the rigidity equivalent to the motor shaft. A backlash, slip
or
de
flection being on the mounting shaft could interfere with normal control.
Please be sure that the encoder wiring
is done correctly. Otherwise an accident could occur.
FRENIC-Ace