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Basic functions (Pr. 0 to Pr. 9)
3.3 Basic functions (Pr. 0 to Pr. 9)
3.3.1 Torque boost (Pr. 0)
<Setting>
• Increase the setting value when the distance between the inverter and motor is long or when the motor torque in
the low speed range is insufficient (when the stall prevention protective function is activated), etc.
• Assuming that the base frequency voltage is 100%, set the 0Hz voltage in %.
3.3.2 Maximum and minimum speed settings
(Pr. 1 , Pr. 2 )
<Setting>
z Speed control
• When the upper limit of the output speed is set in Pr. 1, the output speed is clamped at the maximum speed even if
the speed command entered is higher than the speed set in Pr.1. (This also applies to the minimum speed setting.)
Use this parameter for V/F control only.
z Motor torque in the low speed region can be adjusted according to the load to increase the starting motor
torque.
Parameter Name Factory Setting
Setting
Range
Remarks
0 Torque boost (manual)
4%/3%/2%
(3.7K or less/5.5K, 7.5K/11K or more)
0 to 30% Extended mode
CAUTION
If the setting is too large, the motor may result in overheat or overcurrent trip. The guideline for
maximum value is about 10%.
You can limit the maximum (minimum) speed.
z Speed control
The maximum setting is placed on the running speed.
The minimum setting is placed on the preset speed.
z Torque control
The maximum and minimum settings are made on the speed
limit commands. (Limit is not placed on the running speed.)
z Position control
The maximum setting is valid for the speed command obtained
from the droop pulses. The minimum setting is invalid.
Parameter Name Factory Setting Setting Range Remarks
1 Maximum speed 1500r/min 0 to 3600r/min Simple mode
2 Minimum speed 0r/min 0 to 3600r/min Simple mode
CAUTION
When the Pr. 2 setting is higher than Pr. 13 "starting speed" value, note that the motor will run at the
preset speed by merely turning the start signal on, even if the command speed has not been entered.
Related parameters
• Starting speed setting ⇒ Pr. 13 "starting speed" (Refer to page 84.)
• Speed limit command selection for torque control
⇒ Pr. 807 "speed limit selection" (Refer to page 173.)
• External (example: terminal 2-5 connection) speed setting potentiometer adjustment
⇒ Pr. 902 "speed setting terminal 2 bias"
(Refer to page 190.),
Pr. 903 "speed setting terminal 2 gain" (Refer to page 190.)
speed torque position speed torque
Output speed (r/min)
Pr.1
Pr.2
Set speed
0
10V