The Computer
5-70 Manual # 42-02-1P28 A3
DVR2 MDFE FAIL TO ACT (628)
DVR3 MDFE FAIL TO ACT (661)
DVR4 MDFE FAIL TO ACT (694)
Description: The MDFE input monitors the status of the DFE triac and the
DFE triac driver. When either one 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.
DVR2 MDFE FAIL TO DEACT (627)
DVR3 MDFE FAIL TO DEACT (660)
DVR4 MDFE FAIL TO DEACT (693)
Description: The MDFE input monitors the status of the DFE triac and the
DFE triac driver. When either one 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.
DVR2 MDSE FAIL TO ACT (626)
DVR3 MDSE FAIL TO ACT (659)
DVR4 MDSE FAIL TO ACT (692)
Description: The MDSE input monitors the status of the DSE triac and the
DSE triac driver. When either one fails to activate when expected this fault
is generated. When the doors are locked, the 2L bus is high, the down nor-
mal 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.
DVR2 MDSE FAIL TO DEACT (629)
DVR3 MDSE FAIL TO DEACT (662)
DVR4 MDSE FAIL TO DEACT (695)
Description: The MDSE input monitors the status of the DSE triac and the
DSE triac driver. When either one 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.
DVR2 MRD INPUT FAILURE (639)
DVR3 MRD INPUT FAILURE (672)
DVR4 MRD INPUT FAILURE (705)
Description: The M Contactor Redundancy (MRD) input monitors the nor-
mally 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 nec-
essary.
3. Check the operation of the M contactor.
4. Replace the HC-DVR board.
Table 5.10 Touch Screen Event Listings
Event Description
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