Amplifier Board Calibration; Sensor Re-Calibration Procedure - O. Thompson Microflite Ultra 2000 Installation & Adjustment Manual

opposite polarity. For example, if the meter read +10 mV with you off the car, step back
on the car and adjust the meter for –10 mV.
Step off the car. The meter should read zero. If not, adjust the "SENSOR ADJUST" pot
6.
until it does.
9.1.6

Amplifier Board Calibration

Remove the positive meter lead from T3 and place it on T4. Set the meter to read 0 –
1.
10 volts.
Step back on the car to the same position you were in previously. Turn the "ZERO
2.
ADJUST" pot to obtain 1.0 volts, plus or minus .05 volts.
Step off the car. The meter reading should drop a little. Calculate how much the voltage
3.
drop was by subtracting the current meter reading from 1.00.
Step back on top of the car. Adjust the "ZERO ADJUST" to exactly equal the observed
4.
voltage drop. For example, if the meter dropped to .80 volts when you stepped off,
adjust the pot to obtain 0.20 volts with you standing on the car.
Step back off the car. The meter should read 0.00 volts, plus or minus .05 volts. If not,
5.
adjust the "ZERO ADJUST" pot to obtain 0.00 volts with an empty car.
Place the car with a full load on it at the top floor. Adjust the "GAIN ADJUST" pot to
6.
obtain 8.00 volts, plus or minus .05 volts.
Step off the car. Observe the meter reading. Calculate how much the voltage dropped
7.
(8.00 minus current meter reading).
Step back on the car to the same position, and adjust the "GAIN ADJUST" pot to obtain
8.
8.00 plus the observed voltage drop.
9. Step off the car. The meter should read 8.00, plus or minus .05 volts. If not, adjust the
"GAIN ADJUST" pot until it does.
10. Remove the weight from the car and bring it back to the bottom landing.
With the meter still on T4, adjust the "ZERO ADJUST" pot to get 1.00 volts.
11.
12. Step off the car. Observe the meter reading and calculate the voltage drop.
Step back on the car. Adjust the "ZERO ADJUST" pot to get 1.00 plus the observed
13.
voltage drop.
Step off the car. The meter should read 1.00 volts, plus or minus .05 volts. If not, adjust
14.
the "ZERO ADJUST" pot until it does.
The K-Tech load weigh device is now properly adjusted for the controller. The controller must
now be set up for proper operation. When the car is running at contract speed and all final
adjustments have been made to the motion parameters, refer to Section 9.4 of this chapter for
the controller pretorque set up procedure.
9.2 Sensor Re-calibration Procedure - LW3200
The sensor on the K-Tech LW 3200 Load Weigh unit will require periodic re-calibration. This is
because of changes in ambient temperature of the equipment. The re-calibration procedure
should only take about five minutes.
1. Move the car to the lowest landing in the hoistway. Access the top of the car. If
necessary, run the car down so it is floor level at the bottom floor.
Revision: AA 2.2
Microflite Ultra 2000
Printed 03 - 15 - 03 9 - 4