The Computer
5-72 Manual # 42-02-1P28 A3
DVR2 MTY FAIL TO ACT (620)
DVR3 MTY FAIL TO ACT (653)
DVR4 MTY FAIL TO ACT (686)
Description:
The MTY input monitors the status of the TY triac and the TY triac driver.
When either one fails to activate when expected this fault is generated.
Troubleshooting:
1. Check the starter configuration and programming record.
2. Check motor contactor wiring and voltages at terminal YD1 on the HC-
DVR board.
The TY triac may have failed open. Replace the HC-DVR board.
DVR2 MTY FAIL TO DEACT (621)
DVR3 MTY FAIL TO DEACT (654)
DVR4 MTY FAIL TO DEACT (687)
Description:
The MTY input monitors the status of the TY triac and the TY triac driver.
When either one fails to deactivate when expected this fault is generated.
Troubleshooting:
1. Check the starter configuration and programming record.
2. Check motor contactor wiring and voltages at terminal YD1 on the HC-
DVR board.
3. The TY triac may have shorted. Replace the HC-DVR board.
DVR2 MUFE FAIL TO ACT (633)
DVR3 MUFE FAIL TO ACT (666)
DVR4 MUFE FAIL TO ACT (699)
Description:
The MUFE input monitors the status of the UFE triac and the UFE triac
driver. When either one fails to activate when expected this fault is gener-
ated. When the doors are locked, the 2L bus is high, USL1 and USL2 limits
are closed, the up normal limit (UNTD) is closed and the car is idle, termi-
nals UF and UFE should be 120VAC.
Troubleshooting:
1. Check the associated wiring.
2. Check the up fast valve coil.
3. Run the car up on inspection and verify that terminal UFE goes low.
4. The UFE triac may have failed open. Replace the HC-DVR board.
DVR2 MUFE FAIL TO DEACT (634)
DVR3 MUFE FAIL TO DEACT (667)
DVR4 MUFE FAIL TO DEACT (700)
Description:
The MUFE input monitors the status of the UFE triac and the UFE triac
driver. When either one fails to deactivate when expected this fault is gen-
erated. When the doors are locked, the 2L bus is high, USL1 and USL2 lim-
its are closed, the up normal limit (UNTD) is closed and the car is idle,
terminals UF and UFE should be 120VAC.
Troubleshooting:
1. Check the associated wiring.
2. Check the up fast valve coil.
3. The UFE triac may have shorted. Replace the HC-DVR board.
DVR2 MUSE FAIL TO ACT (624)
DVR3 MUSE FAIL TO ACT (657)
DVR4 MUSE FAIL TO ACT (690)
Description:
The MUSE input monitors the status of the USE triac and the USE triac
driver. When either one fails to activate when expected this fault is gener-
ated. When the doors are locked, the 2L bus is high, USL1 and USL2 limits
are closed, the up normal limit (UNTD) is closed and the car is idle, termi-
nals US and USE should be 120VAC.
Troubleshooting:
1. Check the associated wiring.
2. Check the up fast valve coil.
3. Run the car up on inspection and verify that terminal USE goes low.
4. The USE triac may have failed open. Replace the HC-DVR board.
Table 5.10 Touch Screen Event Listings
Event Description
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