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(18) V/f setting, Torque Compensation Gain KT (C4-01)
No need to change when operating in Flux Vector Control.
Torque from the motor is proportional to approximately the value of (V/f)
2
.
If the width of the V/f ratio is changed at low speeds, then insufficient torque will be produced or Over current
(overexcitation, etc) is likely to occur during Swift Lift. Adjust the V/f ratio by monitoring the motor current.
V/f Control Mode
(1) The V/f characteristics are set by using the motor data to calculate the output current, the minimum voltage, and
the minimum frequency from the torque required to maintain the load (150% torque when hoisting, 100%
torque during traverse operations).
Fmax (E1-04)
= motor max output frequency
Vmax (E1-05) = motor rated voltage
Fbase (E1-06)
= motor base frequency
Fa (E1-07)
= minimum frequency to obtain required torque
Vb (E1-08)
= minimum voltage to obtain required torque
Fmin (E1-09)
= up to 1.5Hz
Vmin (E1-10)
= (Vmax-Vb) / (Fbase-Fa) × (Fmin - Fbase) + Vmax
E1-11, -12, -13 = initial/default value
KT (C4 -01)
= 0.0
Voltage
(E1-05) Vmax
(E1-08) Vb
(E1-10) Vmin
Fmin Fa Fbase Fmax
Freq
(E1-09) (E1-07) (E1-06) (E1-04)
Summary of Contents for CIMR-F7Z
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