5.3 Description of Function Codes 5.3.9 d codes (Applied functions 2)
PG option Ch1/X terminal (Pulse train input)
(Pulse input method, Encoder pulse count, Pulse scaling factor 1, Pulse scaling factor 2)
These function codes specify the command frequency to apply to the inverter. The setting items are the same as
for feedback input (d14 to d17).
Refer to F01.
PG option Ch1/X terminal (Pulse train input) (Filter time constant)
Set filter time constant for pulse train input. The larger the time constant, the slower the response. Specify the
proper filter time constant taking into account the response speed of the machine (load). If the pulse is lower and
frequency command fluctuates, set larger time constant.
Master follower operation (Main speed regulator gain)
d71 adjusts the main speed regulator gain to control the response and the steady-state deviation. Usually, it is not
necessary to change the factory default. Selecting simultaneous start synchronization without Z phase
compensation (d41 = 2) only enables the setting made with d71.
Master-follower operation APR P gain
d72 determines the response of the automatic position regulator (APR). (See Fig. 5.3-51 and Fig. 5.3-52)
If the APR output comes to be a single rotation of the encoder shaft per second when the phase angle error (position
deviation) between the master and follower PGs becomes equal to a single rotation of the encoder shaft, that gain
is assumed to be 1.0.
Setting a too large value to the gain data easily causes hunting, and setting a too small value results in a large
steady-state deviation. Adjust the gain, referring to Fig. 5.3-41 as a guide. If the d72 setting is adjusted, it is
recommended to adjust also the d02 setting as shown in Fig. 5.3-41.
Fig. 5.3-41 d72 setting guide
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