Sensor Calibration - O. Thompson Microflite Ultra 2000 Installation & Adjustment Manual

Connect the sensor cable to the terminal block labeled "SENSOR" on the amplifier board.
Confirm that K-Tech terminal T4 is connected to Encoder terminal J3-1 and K-Tech terminal T5
is connected to encoder terminal J3-2. Ground the shield of the cable inside the Encoder box.
The electronics box is now connected, the sensor mounted, and the unit is ready to be
calibrated.
9.1.5

Sensor Calibration

If possible, perform the calibration while standing off the car top. If this is not possible, be sure
to stand in the same position for each procedure.
1. Bring the car to the lowest landing. There should be nothing in the car or on top of it.
Connect the positive (red) lead of a Digital Volt Meter (DVM) to test point T3 (signal)
2.
and the negative lead (black) to test point T5 (ground). Set the meter to the millivolt
scale.
Note: If the controller is powered up, the red LED should be illuminated. If the
controller is not powered up, do so now.
3. While standing on the car, turn the "SENSOR ADJUST" pot until the meter reads zero,
plus or minus one millivolt.
4. Step off the car. The meter should change, and the voltage should be positive. If the
voltage is negative, the "NON-INVERT/INVERT" switch must be in the "INVERT"
position.
Note: The observed voltage at test point T3 will not change. It will remain
negative. This is OK.
The voltage should be between 5 and 20 mV.
5. Step back onto the car at the same position where you were previously. Adjust the
"SENSOR ADJUST" pot to obtain the same value that was seen with you off, only
Revision: AA 2.2
Microflite Ultra 2000
Connect the AC power supply (Terminals IP
and IPX) to the terminal strip terminals AC
HOT (IPX) and 4 (IP). Ground the lug in the
electronics box to controller ground.
A twisted - shielded cable must be run for the
output of the unit to the car top encoder. The
output of the amplifier board, "SET
POINTCONNECT" terminals T4 & T5 will be
connected to the O. Thompson Encoder
power supply board terminals J3-1 and J3-2.
Route the cable through the knockout in the
K-Tech electronics box to the Encoder.
Connect the cable shield to the ground
terminal in the K-Tech box.
Printed 03 - 15 - 03 9 - 3