Fuji Electric FRENIC MEGA G2 Series - Page 486

5.3 Description of Function Codes 5.3.9 d codes (Applied functions 2)
5-302
 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 32767
Specify the data according to the transmission ratios of the pulley and gear train as shown below.
Fig. 5.3-39 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)
x Encoder shaft speed
Pulse scaling factor 1 (d16)
Pulse scaling factor 2 (d17)
=
b
x
d
Pulse scaling factor 1 (d16)
a
c
Pulse scaling factor 1 (d16)
=
a
x
c
Pulse scaling factor 2 (d17)
=
b
x
d
• Under vector control with speed sensor, either mount the speed detector pulse encoder directly on the
motor shaft, or mount it on a shaft with similar level of rigidity. A backlash, slip or deflection being on
the mounting shaft could interfere with normal control. If the reduction ratio of the shaft with encoder
is high, or the encoder pulse count is low, it may not be possible to perform control correctly.
• If using a dedicated Fuji motor for vector control, the encoder is mounted directly on the motor shaft,
and therefore “1” should be set for both Pulse scaling factor 1 (d16) and Pulse scaling factor 2 (d17).
 PG option Ch2 (Pulse input filter time constant) (d18)
A filter can be applied to pulse input by setting a time constant.
• Data setting range: 0.000 to 5.000 s