Prepare for Final Adjustments
3-31
3
iControl DC
Empty Car Tests
With the car on Machine Room Inspection and with test weights removed (empty car), the fol-
lowing steps allow you to adjust the response of the car to reduce empty car rollback while
avoiding the oscillations that can occur if too much gain is adjusted into the system. For these
tests you may use a storage oscilloscope capable of a 1.0 centimeter per second sweep rate or
you may use the iView Virtual Oscilloscope.
1. On the iView Virtual Oscilloscope, set Test point 1 to Speed Feedback. Adjust the Virtual
Oscilloscope for greater sensitivity and shorter time period. Please refer to “Controller -
Layouts” on page 9-181. If you are using a storage oscilloscope, monitor Test point STP1
(lower right side of the iBox) with respect to GND.
The empty car will probably drift up due to the counterweight, even when an attempt is made to
move it down. Perform the following:
2. Adjust brake Pick delay and Speed pick delay 1 on the iView Configuration > Brake >
Timers tab to coordinate the application of the speed pattern with the picking of the
brake to avoid movement of the car under the brake or rollback of the car.
3. Experiment with improving response. A little rollback at this point is not critical as later
adjustments will compensate for it.
4. Verify that Pattern scaling is 100% (Configuration > Pattern > Common tab).
5. Using Speed/Actual on the iView Operational Status tab or a hand held tachometer, ver-
ify that the car speed, while operating on Machine Room Inspection, matches the
Inspection/High Speed setting (Configuration > Pattern > Modes tab) and is 10% of the
Standard/High Speed setting. Please refer to “Calibrating Actual Car Speed (System 12
SCR Drive)” on page 2-62 if necessary.
At this point, the iBox Fault/Function Bypass switch should be in the OFF position. Fix all faults so
that no fault is bypassed before proceeding. If this is not possible, exercise EXTREME CAUTION
while making final adjustments.
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