4-119
4-2 Function Mode
4
Functions
Preliminary Excitation Function (FOC)
•This function supplies excitation current from an input terminal to establish magnetic flux
preliminarily, when "03" (sensorless vector control), "04" (0-Hz sensorless vector control), or "05"
(sensor vector control) is selected in V/f characteristics selection A004/A244.
•Allocate 55 (FOC) to the desired multi-function input.
•The Inverter does not accept the RUN command unless the FOC terminal is turned on when FOC
is allocated.
•If the FOC terminal is turned off during operation, the Inverter goes into free-run status. If the FOC
terminal is turned on again, the Inverter restarts according to the setting of free-run stop selection
b088.
High-torque Multi-operation
•When "sensorless vector control" or "0-Hz sensorless vector control" is selected with a single
Inverter, this function controls two motors of the same type to drive a single load.
•To use this function, you set the same parameters as when you select "Sensorless Vector Control"
(page 4-116) or "0-Hz Sensorless Vector Control" (page 4-117). However, set the motor
parameters as follows:
•Set motor parameters R1, R2, and L to one half of the set value for one motor.
•Set motor parameter Io to be twice the set value for one motor.
•Set motor parameter J to one half of the total moment of inertia of two motors and loads
connected to these motors.
•Select the motor capacity value closest to the total capacity of two motors.
•When different loads are driven with two motors, a fluctuation in one load affects the operating
condition of the other, which may hinder normal control.
To prevent this, be sure to operate a system in a way that the load driven by two motors is regarded
as one load.
FOC
FW (RV)
Output frequency
Excitation current flows.
Free running
Restarts according to b088.
Does not operate because
the FOC terminal is OFF.
Related functions A044/A244, C001 to C008
Related functions
A044/A244, F001, b040, b041 to b044, H002/H202, H003/H203, H004/
H204, H005/H205, H020/H220, H021/H221, H022/H222, H023/H223,
H024/H224, H050/H250, H051/H251, H052/H252
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