4.3 Basic functions (Pr. 0 to Pr. 9)
Torque boost (Pr. 0)
Use this parameter for V/F control only.
Motor torque in the low speed region can be adjusted according to the load to increase the starting motor
Torque boost (manual)
• Increase the setting when the distance between the inverter and motor is long or when the motor torque in the low
speed region is insufficient (when the stall prevention protective function is activated), for example.
• Assuming that the base frequency voltage is 100%, set the 0Hz voltage in %.
If the setting is too large, the motor may result in overheat or overcurrent trip. The guideline for
maximum value is about 10%.
Maximum and minimum speed settings
You can limit the maximum (minimum) speed.
The maximum setting is placed on the running speed.
The minimum setting is placed on the preset speed.
The maximum and minimum settings are made on the speed
restriction commands. (Restriction is not placed on the running
The maximum setting is valid for the speed command obtained
from the droop pulses. The minimum setting is invalid.
• 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.)
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.
• Starting speed setting ⇒ Pr. 13 "starting speed" (Refer to page 97.)
• Speed restriction command selection for torque control ⇒ Pr. 807 "speed restriction selection" (Refer to page 185.)
• External (example: terminal 2-5 connection) speed setting potentiometer adjustment ⇒ Pr. 902 "speed setting No. 2 bias" (Refer to
Pr. 903 "speed setting No. 2 gain" (Refer to page 202.)
(2.2K/3.7K, 7.5K/15K or more)
, Pr. 2
Basic functions (Pr. 0 to Pr. 9)
0 to 30%
Output speed (r/min)
0 to 3600r/min
0 to 3600r/min