Limit Board Testing; Nts Testing; Limit Board Faults - O. Thompson Microflite Ultra 2000 Installation & Adjustment Manual

8.6

Limit Board Testing

After the learn procedure has been performed, run the car on automatic operation. The car
should run at contract speed and decelerate normally. Run the car to the top and bottom floor
and confirm that LED D25 on the board stays on continuously. If it starts to flash at any time, the
board has detected the car was approaching a terminal floor too fast, and has brought the car
into the floor. If this occurs, the board has not been set up correctly, and the learn procedure
must be performed again.
Once it has been confirmed that the car runs normally, it is necessary to test the board.
BEFORE THE BOARD IS TESTED, IT MAY BE NECESSARY TO PREVENT THE CAR
SAFETY AND/OR COUNTERWEIGHT SAFETY FROM APPLYING. To do this, disable the
safety devices by tying the safety arm down so it will not apply if the car or counterweight strikes
the buffer.
After the safeties have been disabled, run the car on automatic to a floor in the center of the
hoistway. Access the Parameters menu on the MPU. Go to the "Floor Landing Values" menu.
Change the bottom floor to "000002." Change the top floor value to a value 10,000 counts above
its present setting. Save these changes and exit the Parameters menu.

8.6.1 NTS Testing

Place a car call for the bottom floor. The processor will not attempt to slow the car down, and the
Limit board will slow and stop the car in the door zone of the bottom floor. Place a car call for the
top floor. Again, the processor will not attempt to slowdown, and the Limit board will slow and
stop the car in the door zone of the top floor.
8.6.2 ETS Testing
Run the car back to the center of the hoistway. After the car stops, remove connectors J3 and J7
from the limit board. Using two short pieces of wire, jump J3-1 to J7-1 and J3-2 to J7-2. Place a
car call for the bottom floor. The car will not attempt to slowdown, and the Limit board will
attempt to slow the car down. When the car does not respond, the Limit board will trip, removing
power from the hoist motor and brake, stopping the car. This will occur when the speed of the
car exceeds a value at which the Limit board can safely slow and stop the car. Place a car call
for the top floor. Again, the car will not attempt to slowdown, and the Limit board will trip and stop
the car.
8.7

Limit Board Faults

After the car is placed in operation, some of the diagnostic LED's may blink, indicating that a fault
has occurred. Refer to the following Table for an explanation of the faults.
LED Fault Description
Terminal Slowdown
D25 Flashing
D10 Speed Feedback Loss
Slowdown Sequence
D11
Revision AA2.2
Microflite Ultra 2000
The Limit board has detected that the car was approaching a
terminal floor at a speed greater than it should have. The board
Occurrence
initiated a slowdown and stopped the car.
The Limit board has detected that the car has been running, but
no Speed Feedback has been present. This will cause the Limit
board to trip, removing power from the hoist motor and brake.
The Limit board has detect that the slowdown switches are
opening in a sequence other than that which was seen during
Fault the learn procedure. This could be caused by faulty wiring or a
bad limit switch.
Printed 03 - 15 - 03
Corrective Action
8- 6