Powering On And Checking; Selecting A Desired Motor Drive Control - Fuji Electric FRENIC-HVAC User Manual

5.7.6

Powering ON and checking

• Be sure to mount the front cover before turning the power ON. Do not remove the cover when the inverter
power is ON.
• Do not operate switches with wet hands.
Otherwise, an electric shock could occur.
Turn the power ON and check the following points. The
following is a case when no function code data is
changed from the factory defaults.
(1) Check that the LCD monitor displays 0.00 Hz
(indicating that the reference frequency is 0 Hz)
that is blinking. (See Figure 5.18.)
If the LCD monitor displays any number except
0.00 Hz, press the
5.7.7

Selecting a desired motor drive control

The FRENIC-HVAC supports the following motor drive control.
 V/f control with slip compensation inactive
Under this control, the inverter controls a motor with the voltage and frequency according to the V/f
pattern specified by function codes. This control disables all automatically controlled features such
as the slip compensation, so no unpredictable output fluctuation results, enabling stable operation
with constant output frequency.
 V/f control with slip compensation active
Applying any load to an induction motor causes a rotational slip due to the motor characteristics,
decreasing the motor rotation. The inverter's slip compensation function first presumes the slip value
of the motor based on the motor torque generated and raises the output frequency to compensate for
the decrease in motor rotation. This prevents the motor from decreasing the rotation due to the slip.
That is, this function is effective for improving the motor speed control accuracy.
The compensation value is specified by combination of function code P12 (Rated slip frequency).
H68 enables or disables the slip compensation function according to the motor driving conditions.
H68 data
0
1
2
3
/ key to set 0.00 Hz.
Motor driving conditions
Accl/Decel Constant speed
Enable Enable
Disable Enable
Enable Enable
Disable Enable
Figure 5.18 Display of the LCD Monitor after
Motor driving frequency zone
Base frequency or
below
Enable
Enable
Enable
Enable
5-100
Power-on
Above the base
frequency
Enable
Enable
Disable
Disable