Fuji Electric FRENIC-ECO, Инструкция по эксплуатации

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5-66
Curvilinear acceleration/deceleration
Acceleration/deceleration is linear below the base frequency (linear torque) but slows down
above the base frequency to maintain a certain level of load factor (constant output).
This acceleration/deceleration pattern allows the motor to accelerate or decelerate with the
maximum performance of the motor.
The figures at left show the
acceleration characteristics.
Similar characteristics apply
to the deceleration.
Choose an appropriate acceleration/deceleration time considering the machinery’s
load torque.
H09
H17
Select Starting Characteristics (Auto search for idling motor speed)
Select Starting Characteristics (Frequency for idling motor speed)
H09 and H17 specify the auto search mode for idling motor speed and its frequency, respectively,
to run the idling motor without stopping it.
The auto search mode can be switched by assigning the (STM) terminal command to one of
digital input terminals (E01 to E05, function code data = 26). If no (STM) is assigned, the inverter
interprets it as (STM) being ON by default.
Searching for idling motor speed
When a run command is turned ON with the (STM) being ON, the inverter starts the auto search
operation at the auto search frequency specified by H17 to run the idling motor without stopping it.
If there is a large difference between the motor speed and the auto search frequency, the current
limiting control may be triggered. The inverter automatically reduces its output frequency to
harmonize the idling motor speed. Upon completion of the harmonization, the inverter releases
the current limiting control and accelerates the motor up to the reference frequency according to
the preset acceleration time.