Troubleshooting
6-22 Manual # 42-02-1P21
INSPECTION DIRECTION SW. FAILURE (CTLB)
Description: Both UP and DN Machine Room Inspection directions are activated at the same time.
Troubleshooting:
1. Exercise the HT-CTL board Inspection direction switch. Verify that it remains in the middle
when released.
2. Check status of UP and DOWN indicator LEDs.
INSPECTION OPERATION
Description: The car is on Inspection operation.
Troubleshooting: Check all of the inspection switches and associated wiring.
LANDING SYSTEM REDUNDANCY FAILURE (Non ASME-2000)
Description: Either DZ, LU or LD has failed closed.
Troubleshooting: Ensure that on any run between floors, the LSR input goes low at least once. If
the DZ sensor has failed closed, power will be present continuously on the LSR input. If either the
LU or LD sensor has failed closed, power will be present constantly on their respective inputs and
this can also cause this error. This condition can be cleared by pressing the Redundancy Reset but-
ton.
LEVELING DOWN
Description: The Level Down computer input is ON. Comes ON normally when the car is just
above a floor. If the car is level with the floor and a message appears, it is usually the result of a
switch or sensor problem.
Troubleshooting: Inspect the LD switch or sensor on the landing system and the placement of the
landing system vane or magnet for that floor.
LEVELING SENSOR FAILED - OFF POSITION
Description: One of the leveling sensor inputs (LU or LD) appears to have failed (in the inactive
state). The controller computer did not detect the appropriate leveling signal (LU or LD) during the
last approach to the floor. Probable causes may be:
1. A faulty leveling sensor or associated circuitry (within the landing system assembly);
2. Faulty wiring from the landing system to the controller;
3. Faulty computer input circuit (HC-CTL Control board).
Troubleshooting: Check operation of the leveling sensors and associated wiring (place car on
inspection, move above and below a landing, noting the transitions in the leveling signal(s) coming
from the landing system).
Verify that the computer diagnostic display of LU and LD matches the state of the sensor signals at
the main relay board.
LEVELING SENSOR FAILED - ON POSITION
Description: One of the leveling sensor inputs (LU or LD) appears to have failed (in the active
state). The controller computer detected that both the LU and LD inputs are active simultaneously.
Probable causes may be:
1. A faulty leveling sensor or associated circuitry (within the landing system assembly);
2. Faulty wiring from the landing system to the controller;
3. Faulty computer input circuit (HC-CTL Control board).
Troubleshooting: Check operation of the leveling sensors and associated wiring (place car on
inspection, move above and below a landing, noting the transitions in the leveling signal(s) coming
from the landing system).
Verify that the computer diagnostic display of LU and LD matches the state of the sensor signals at
the main relay board.
Check also the operation of any contacts that may be placed at the “low side” (the “1-bus” side) of
the LU and LD relay coils (e.g., H, INT). Check that such contacts close properly when appropriate.
Table 6.1 Status and Error Messages
Scrolling Message - Special Event Message
To Next Page
Loading...