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Geo Brick Drive User Manual
Motor Setup
206
Ixx77 Optimization Procedure:
Issue a 25% Open Loop Command (i.e. #4O25) and monitor the motor velocity in the position
window (scaled to rpm). The motor should reach and run steadily at a speed that is less than or
equal to the motor base speed. The goal of this first step is to achieve a smooth run at a constant
speed.
Caution
If the motor reaches a speed that is greater than the rated base speed,
Kill the motor, increase Ixx77 and redo the open-loop test again.
Note
If the motor takes too long to take off, or does not move, increase the
open loop command by increments of 10.
If the motor has reached its base speed in the first step, then this is the nominal magnetization
current Ixx77. Skip the rest of this procedure.
Most likely, that the motor will reach a speed that is much lower than the base speed. Decrease
Ixx77 gradually (decrements of 500) and wait for the velocity to settle. The desired nominal
Ixx77 is the value allowing the motor to reach its base speed.
Kill the motor
Slip Gain
With AC induction motor, the slip gain Ixx78 controls the relationship between the torque command and
the slip frequency of magnetic field on the rotor. It is directly proportional to the torque
Having optimized the magnetization current Ixx77, a slip gain Ixx78 correction is a good starting point.
This can be done using the empirical equation and substituting the initially guessed magnetization gain
with the optimized value:
I478=(We-Wm)*Tp*I477/32768
; Motor #4 Slip Gain Constant
Note
At this point of the AC Induction Motor Setup, you should be able to
run the motor in either Open-Loop (i.e. #nO25) at base speed or
closed-Loop (i.e. Jog commands) at a pre-defined speed and
acceleration (Ixx22, Ixx19)
If you are satisfied with the rise time of the motor or if it is not of significance for the application then the
slip gain optimization procedure can be skipped.
If, in closed-loop, you trigger a fatal following error, try increasing the following error limit or decreasing
the acceleration rate (Ixx19) which could be violating how quick the slip gain Ixx78 allows the motor to
accelerate.
Содержание Geo Brick
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Страница 286: ...Geo Brick Drive User Manual Appendix A 286 APPENDIX A Schematic Samples Watchdog X15 Inputs J6 J7...
Страница 287: ...Geo Brick Drive User Manual Appendix A 287 Outputs J6 J7 603793 109 and earlier Outputs J6 J7 603793 10A and later...
Страница 288: ...Geo Brick Drive User Manual Appendix A 288 Limits Flags J4...