Installation manual

Motor Control Parameters
72 S1A53838 09/2011
Expert parameters
Code Name / Description Adjustment range Factory setting
F390 [LL for ov.cur. prev.]
Lower Limit function for Over Current Prevention 0.0 - UL 0.0
In the present software, motor speed is decreased to 0Hz in case the stall prevention state is continued.
When motor speed is lower than
F390 during stall prevention, motor speed is kept to F390 to increase motor current.
In this situation, motor current is beyond stall prevention level (
F601 or F185), therefore over current or over load
detected fault may occur in some case.
F480 [No load cur. coef]
Magnetizing current coefficient 100 to 130% 100%
Use parameter F480 to fine tune motor torque during low-speed operation. To increase motor torque in the low-speed
operating range, increase the setting of parameter
F480. However, only adjust parameter F480 if an auto tune does
not yield sufficient low-speed torque. Increasing the setting of parameter
F480 may increase the motor’s no-load current
during low-speed operation. Do not set this parameter so that the motor’s no-load current exceeds its rated operating
current.
F485 [Stall control coef. 1]
Stall prevention control coefficient 1 10 to 250 100
Use parameter F485 to adjust the drive’s response to large, sudden changes in load when the motor is operated above
its rated frequency. If a sudden change in load causes the motor to stall before the drive goes into current limit, gradually
reduce the setting of
F485.
F492 [Stall control coef. 2]
Stall prevention control coefficient 2 50 to 150 100
Use parameter F492 to adjust the drive’s response to a drop in the line supply voltage when the motor is operated above its
rated frequency. Such a drop in voltage often causes fluctuations in motor current or vibration in the motor. To reduce these dis-
turbances, set parameter F492 to a value between 80 and 90.
Note: Reducing the F492 setting increases the motor running current level.
F494 [Mot. adj coefficient]
Motor adjustment coefficient - -
DO NOT ADJUST.
F495 [Motor voltage coef.]
Maximum voltage adjustment coefficient 90 to 120% 104%
Use parameter F495 to limit the drive’s maximum output voltage. Increasing this setting increases torque when the
motor is operated above its rated frequency, but may also cause motor vibration. Do not increase the value of
F495 if
motor vibrations occur.
F496 [PWM adj. coef.]
Waveform switching adjustment coefficient 0.1 to 14.0 kHz 14.0 kHz
Adjusting the value of parameter F496 may reduce motor noise and vibration during PWM waveform frequency shifts
in the mid-speed operating range.
Frequency command
RUN command (F or R)
Output Frequency (Hz)
F390
0Time
Over current alarm status
ON
OFF
ON
OFF