Fuji Electric FRENIC MEGA G2 Series - Page 884

12.3 Common Specifications
12-18
Table 12.3-4
Item
Explanation
Remarks
Control
Anti-regenerative
control (Automatic
deceleration)
∙ If the intermediate DC voltage/torque calculation value reach or exceed
the anti-regenerative control level when the motor is decelerating, the
deceleration time is automatically extended to avoid an overvoltage trip.
(Forced deceleration can be set at three or more times the deceleration
time.)
∙ If the torque calculation value reaches or exceeds the anti-regenerative
control level during constant speed operation, overvoltage tripping is
avoided by performing control to raise the frequency.
Deceleration
characteristics
(Improvement of
braking
performance)
The motor loss is increased during deceleration to reduce the regenerative
energy in the inverter to avoid overvoltage trip.
Auto energy saving
operation
Controls the output voltage to minimize the total sum of the motor loss and
inverter loss. (Auto energy saving control can be turned ON and OFF from
an external source with a digital input signal.)
Overload
prevention control
If the surrounding temperature or IGBT junction temperature increases
due to overload, the inverter lowers the output frequency to avoid
overload.
Offline tuning
Tunes the motor while the motor is stopped or running, for setting up motor
parameters.
Online tuning
This corrects changes in motor constants caused by temperature rise.
Cooling fan
ON-OFF control
∙ Detects inverter internal temperature and stops cooling fan when the
temperature is low.
∙ Possible to output a fan control signal to an external device.
Motor 1 to 4
settings
∙ Switching is possible between 4 motors. (Synchronous motor switching is
not possible.)
∙ It is possible to switch between four types of specific function code data
(switching is possible while the motor is running.)
The following data can be set for motors 1 to 4: base frequency, rated
current, torque boost, electronic thermal slip compensation.
Universal DI
Transfers the status of an external digital signal connected with the
general-purpose digital input terminal to the host controller.
Universal DO
Outputs a digital command signal sent from the host controller to the
general-purpose digital output terminal.
Universal AO
Outputs an analog command signal sent from the host controller to the
analog output terminal.
Speed control
∙ Selection is possible from four types of auto speed regulator (ASR)
parameters.
∙ Notch filter for vibration control
Line speed control
To suppress increases in peripheral speed (line speed), the motor speed is
controlled so that the peripheral speed remains constant even if the roll
winding diameter changes.
Master-follower
operation
Performs synchronization for two motors.
Pre-excitation
Excitation is carried out to create the motor flux before starting the motor.
Zero speed control
The motor speed is held to zero by forcibly zeroing the speed command.
Servo lock
Stops the motor and holds the motor in the stopped position.
DC braking
Applies DC current to the motor when the inverter starts or stops to
generate braking torque.