5.3 Description of Function Codes 5.3.9 d codes (Applied functions 2)
Data setting for master-follower operation
Select the pulse train input (F01/C30 = 12) as a reference command source.
Switching between master-follower operation and individual operation is possible using the “Hz2/Hz1” terminal
command (see Figure 5.3 25 and Figure 5.3 26). A switching example is given below.
(Example) Turning terminal [X1] ON for individual operation during which a digital frequency command drives the
inverter
Set F01 and C30 data to “12” and “0”, respectively. And set E01 data to “11” to assign the “Hz2/Hz1” command to
terminal [X1].
It is recommended to perform switching between master-follower operation and individual operation when the
inverter is stopped. Switching when the inverter is running may activate the protective function. To avoid it, decrease
the difference between the output frequency and the reference frequency to apply after switching.
Also in master-follower operation, the inverter controls the output frequency according to the acceleration
/deceleration time as usual. Set the acceleration/deceleration time as short as possible. Be careful that, setting the
acceleration/deceleration time longer than that of the reference inverter loses the following capability of the follower
motor.
Selecting “Vector control for induction motor with speed sensor” (F42 = 6) ignores the acceleration
/deceleration times specified by the function codes, running the motor with the acceleration/deceleration
time 0.0 s.
Starting frequency, Starting frequency (Holding time)
Stop frequency, Stop frequency (Holding Time)
Set the starting frequency and stop frequency as low as possible to the extent that the motor can generate enough
torque. During master-follower operation, basically set the holding times for the starting frequency and stop
frequency at 0.0 s. Running at a frequency lower than the stop frequency or starting frequency the master cannot
be followed. Be careful that specifying the holding time deteriorates the following capability at the time of startup or
stop.
Selecting “Vector control for induction motor with speed sensor” (F42 = 6) ignores the starting/stop
frequencies (holding time) specified by the function codes, running the motor with the holding time 0.0 s.
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