Troubleshooting
6-10 Manual # 42-02-1P21
DOL INPUT FAILURE (CTLB)
Description: The Door Open Limit (DOL) input is not in the correct state for the position of the
door as determined by the Door Position Monitor (DPM) input and the Gate Switch (GS) input.
Troubleshooting:
1. If DPM is high, DOL must also be high. Check the wiring to terminal DOL on HC-CTL or HC-UIO-
board.
2. If the GS input is high, DOL must also be high. Check the wiring to terminal GS.
DOLR INPUT FAILURE (RDRB)
Description: The Rear Door Open Limit (DOLR) input is not in the correct state for the position of
the door as determined by the Rear Door Position Monitor (DPMR) input and the Rear Gate Switch
(GSR) input.
Troubleshooting:
1. If DPMR is high, DOLR must also be high. Check the wiring to terminal DOLR on HC-CTL-2 or
HC-UIO board.
2. If the GSR input is high, DOLR must also be high. Check the wiring to terminal GSR.
DOOR CLOSE PROTECTION TIMER ELAPSED
Description: A failure to lock the doors is detected. This failure condition exists when the doors
have closed (DCLC = 1 or DCL = 0/DPM=1) a demand exists for the car to move (DCP=1),but the
doors are not locked (DLK = 0) within 60 seconds.
Troubleshooting: If the Retiring Cam option is set, verify the Retiring Cam relay is activated
(DCP=1, DCL=0/DPM=1 or DCLC=1) and the doors lock (DLK=1). If no Retiring Cam is used, verify
the door lock circuitry contacts are closed to provide power to the door lock input (DLK=1). When a
predetermined number of sequential failures is detected, default set to four, the car will shutdown.
The failure will be reset once the doors are locked (DLK=1), if the car is placed on Inspection, or
the Computer Reset Button is pressed.
DOOR ZONE SENSOR FAILURE - OFF POSITION
Description: Indicates that the car completed a run, but did not see door zone.
Troubleshooting: Place car on Machine Room Inspection and press the FAULT RESET button on
the HC-CTL board to restore operation. Run the car to the same floor and verify that DZ=1 or
DZR=1. Check placement of DZ magnets.
DOOR ZONE SENSOR FAILURE - ON POSITION
Description: The controller computer detected that one of the DZ inputs (front or rear) did not
transition to the low state during the last elevator run. Probable cause may be:
1. A faulty door zone 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 door zone sensors and associated wiring (place car on
inspection, move car away from the floor, noting the transitions in the door zone signal(s) coming
from the landing system).
Verify that the computer diagnostic display of DZ (or DZ rear) matches the state of the sensor sig-
nals at the HC-CTL-2 Control board. Verify voltage on DZ or DZ rear.
DOWN NORMAL LIMIT OPEN (Hydro only)
Description: This message indicates that the car has traveled beyond the bottom terminal landing
and has opened the down normal (directional) terminal switch.
Troubleshooting:
1. Check the location of the car.
2. Check the voltage at terminal DNTD.
3. Check the limit switch connections.
Table 6.1 Status and Error Messages
Scrolling Message - Special Event Message
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