2-166 Torque Performance Modes
Figure 2.18 Accel Profile during Normal Start - No Flux Up
The second method is Flux Up Mode. In this mode, DC current is applied to
the motor at a level equal to the lesser of the current limit setting, drive rated
current, and drive DC current rating. The flux up time period is based on the
level of flux up current and the rotor time constant of the motor.
The flux up current is not user adjustable.
Figure 2.19 Flux Up Current versus Flux Up Time
[Flux Up Time]
Once rated flux is reached in the motor, normal operation begins and the
desired acceleration profile is achieved.
Figure 2.20 Rated Flux Reached
Time
0
Frequency
Reference
Frequency
Rated Flux
Rotor
Stator
Oscillation due
to flux being
established
Flux Up Time
Flux Up Current = Maximum DC Current
Rated Motor Flux
Motor Flux
Rated Flux
Current
T1
T2
T3
T4
Flux Up Current
Time
Ir Voltage - SVC
Greater of IR Voltage or
Voltage Boost - V/Hz
Flux Up
Normal
Operation
Flux Up
Voltage
Motor Flux
Stator Voltage
Rotor Speed
Motor Flux
Stator Freq
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