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5.12.3 Speed
Gain Adjustment
When not using the FFTC or when the gain of the FFTC must be kept lower,
the speed control gains play a greater rol in controlling the elevator. Always start
adjustment with the proportional gain LF.31 and then proceed on the the integral
gains in LF.32 and LF.33. All the gains are divided into 3 values, A for acceleration
and contact run, d for deceleration, and P for pre-torque. The pre-torque values
are for the pre-torque function only and are described in section 5.12.4.
The proportional gain maintains general control and stability over the entire
speed range. The proportional gain is split into two values one for acceleration
and constant speed (A.LF.31) and one for deceleration (d.LF.31). Additionally,
the value can be automatically reduced as the speed transitions from slow speed
to contract speed.
LF.31 sets the overall gain. Lower values, less than 1000, may result in loose
control and overshoot of the command speed as high speed is reached. Higher
values can cause high frequency oscillation or a buzzing sound in the motor.
If tighter control is necessary during the start or stop that gain can be raised
accordingly in A.LF.31 or d.LF.31.
3000 is a good number to start with for geared and high speed gearless
applications. For lower speed to medium speed gearless, 1500 is a good
starting point.
LF.31 = 1000 Actual speed overshoots during transition into high speed. Raise
in steps of 500 until overshoot is gone, 3000 is a good number.
LF.31 = 500 Motor has poor control with strong oscillations. Raise in steps of
500 until better control is achieved.
Proportional Gain
Initial Start Up
LF.42
LF.42
i
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