Troubleshooting
6-14 Manual # 42-02-1P21
DVR-’n’ MDFE FAILED TO ACTIVATE (n = 2 or 3) (Hydro only)
Description: The MDFE input monitors the status of the DFE triac and the DFE triac driver. When
either fails to activate when expected this fault is generated. When the doors are locked, the 2L bus
is high, DSL1 and DSL2 limits are closed, the down normal limit (DNTD) is closed and the car is
idle, terminals DF and DFE should 120VAC.
Troubleshooting:
1. Check the associated wiring.
2. Check the down fast valve coil.
3. Run the car down on inspection and verify that terminal DFE goes low.
4. The DFE triac may have failed open. Replace the HC-DVR board.
DVR-’n’ MDFE FAILED TO DEACTIVATE (n = 2 or 3) (Hydro only)
Description: The MDFE input monitors the status of the DFE triac and the DFE triac driver. When
either fails to deactivate when expected this fault is generated. When the doors are locked, the 2L
bus is high, DSL1 and DSL2 limits are closed, the down normal limit (DNTD) is closed and the car is
idle, terminals DF and DFE should 120VAC.
Troubleshooting:
1. Check the associated wiring.
2. Check the down fast valve coil.
3. The DFE triac may have shorted. Replace the HC-DVR board.
DVR-’n’ MDSE FAILED TO ACTIVATE (n = 2 or 3) (Hydro only)
Description: The MDSE input monitors the status of the DSE triac and the DSE triac driver. When
either fails to activate when expected this fault is generated. When the doors are locked, the 2L bus
is high, the down normal limit (DNTD) is closed and the car is idle, terminals DS and DSE should
120VAC.
Troubleshooting:
1. Check the associated wiring.
2. Check the down slow valve coil.
3. Run the car down on inspection and verify that terminal DSE goes low.
4. The DSE triac may have failed open. Replace the HC-DVR board.
DVR-’n’ MDSE FAILED TO DEACTIVATE (n = 2 or 3) (Hydro only)
Description: The MDSE input monitors the status of the DSE triac and the DSE triac driver. When
either fails to deactivate when expected this fault is generated. When the doors are locked, the 2L
bus is high, the down normal limit (DNTD) is closed and the car is idle, terminals DS and DSE
should 120VAC.
Troubleshooting:
1. Check the associated wiring.
2. Check the down slow valve coil.
3. The DSE triac may have shorted. Replace the HC-DVR board.
DVR-’n’ MRD INPUT FAILURE (n = 2 or 3) (Hydro only)
Description: The M Contactor Redundancy (MRD) input monitors the normally closed auxiliary
contact of the M contactor.
Troubleshooting:
1. The wiring or devices connected to MR1 input may not be terminated.
2. Check the M auxiliary contact wired to terminal MR1 and replace if necessary.
3. Check the operation of the M contactor.
DVR-’n’ MSSD FAILED TO ACTIVATE (n = 2 or 3) (Hydro only)
Description: MSSD monitors the solid state output of U1 and driver TY for proper operation. If
either fail in the off position this fault is generated. When terminal OL2 is 120VAC and the car is
commanded to run up, terminal SSD should be 120VAC.
Troubleshooting:
1. Check the wiring at terminal SSD and OL2.
Table 6.1 Status and Error Messages
Scrolling Message - Special Event Message
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