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Auxiliary function
2
FUNCTIONS
2.11.2 Automatic torque boost selection (Pr. 98 )
<Operating conditions>
•The number of motor poles should be any of 2, 4 and 6 poles.
•Single-motor operation (One motor for one inverter)
•The wiring length from inverter to motor should be within 30m.
<Setting>
• Also when the Pr. 98 setting is other than "- - -", Pr. 3 "base frequency" and Pr. 19
"base frequency voltage" are valid.
• When "- - -" or "888" is set in Pr. 19, the rated output voltage is selected.
You can choose automatic torque boost control.
Automatic torque boost control
Not only gives the motor the optimum excitation but also provides high torque
even in a low speed range.
Parameter Name
Factory
Setting
Setting
Range
Remarks
98
Automatic torque boost
selection (motor capacity)
- - -
0.2 to 15kW,
- - -
Setting is enabled when
Pr. 30 = "1"
Parameter Setting Description
98
- - - Ordinary V/F control and torque boost (Pr. 0, Pr. 46) are valid.
0.2 to 15kW
Automatic torque boost control valid
(Set the applied motor capacity or one rank lower motor capacity.)
CAUTION
During operation using automatic torque boost, write to Pr. 3 and Pr. 19 is
disabled even if "2" is set in Pr. 77.
♦Related parameters♦
• Torque boost ⇒ Pr. 0 "torque boost", Pr. 46 "second torque boost" (refer to page 73)
• Base frequency ⇒ Pr. 3 "base frequency", Pr. 19 "base frequency voltage" (refer to page 75)
• Applied motor setting ⇒ Pr. 71 "applied motor" (refer to page 80)
• Motor primary resistance ⇒ Pr. 99 "motor primary resistance" (refer to page 134)