Learn Procedure Faults - O. Thompson Microflite Ultra 2000 Installation & Adjustment Manual

The Limit board requires a learn procedure for calibration. With the car on inspection, place it
somewhere near the center of the hoistway, away from all terminal floor slowdown switches.
Verify that all of the limit switches are turned on by checking the LED's on the board. Use the
chart below to determine which LED corresponds to which limit.
LED D9 should be turned off. It will come on when the car is on Automatic operation with the
doors closed.
Next, bring the car to the lowest landing door zone on inspection operation. Disable the doors,
and place the car on Automatic operation. Press and hold switch S3. Press and release switch
S1. Release switch S3. D25 will begin blinking rapidly, and D10, D11 and D12 will be illuminated.
Do a high-speed run to the top floor. After the car stops, D10 will turn off. This confirms that the
board has recorded the positions of the top and bottom limit switches and learned the contract
speed of the car. If D10 or D11 LED's are flashing, the board has detected a fault. Refer to
Section 5 for an explanation of the fault.
The next step of the learn procedure requires the car to make a one floor run in the up direction.
To do this, run the car down to a floor toward the middle of the hoistway. This floor must be of
typical height for the building. Make a one floor run in the up direction.
Run the car back to the top floor. Once the car stops, D11 will turn off, indicating that the Limit
board has measured and saved the maximum deceleration of the car.
Run the car back down to the bottom floor. After the car stops, D12 will turn off, and D25 will
stop blinking and remain on. This will indicate the learn procedure has been completed
successfully.
8.5

Learn Procedure Faults

If the Limit board detects a fault during the learn procedure it will begin flashing the D10 or D11
LED's. Refer to the following table for an explanation of the faults and corrective action.
LED Fault Description
D10 Speed Feedback Fault
D11 Encoder Wiring Fault
D10 & D11 Speed Reference Fault
Revision AA2.2
Microflite Ultra 2000
Limit LED
U1 D1
U2 D2
U3 D3
U4 D4
The Limit board has not detected the Speed Feedback signal
from the encoder. Check the encoder wiring at connector J9.
The Limit board has detected a problem with the Speed
Feedback signal. The most likely cause is a wiring error of the
encoder signal at connector J9. Check the wiring and confirm
that it is wired as shown in Figure 1.
The Limit board has not detected a Speed Reference signal at
connector J3. Confirm that J3 is wired as shown in Figure 1. If
the problem persists, replace the Limit board.
Printed 03 - 15 - 03
Limit LED
D1 D5
D2 D6
D3 D7
D4 D8
Corrective Action
8- 5