Status and Error Messages
6-25
MDFE FAILED TO ACTIVATE (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.
MDFE FAILED TO DEACTIVATE (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.
MDFE INPUT IS LOW (CTLB) (Hydro only)
Description: The input that monitors the continuity of the DN Fast Valve coil and also checks the
off state of the (DFE) triac.
Troubleshooting:
1. Check the termination of the valve coil at terminal DFE on the HC-DVR board.
2. Check terminal DF for 120VAC with respect to 1 bus.
MDSE FAILED TO ACTIVATE (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.
MDSE FAILED TO DEACTIVATE (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.
MDSE INPUT IS LOW (CTLA) (Hydro only)
Description: The MDSE input monitors the continuity of the DN Slow Valve coil and also checks
the OFF state of the DSE triac.
Troubleshooting:
1. Check the termination of the valve coil at terminal DSE on the HC-DVR board.
2. Check terminal DS for 120VAC with respect to 1 bus.
Table 6.1 Status and Error Messages
Scrolling Message - Special Event Message
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