The Computer
5-90 Manual # 42-02-1P28 A3
MSSD FAIL TO ACT (598) Description: MSSD monitors the solid state output of U1 and driver TY for
proper operation. If either one fails in the off position this fault is gener-
ated. 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.
2. Replace the HC-DVR board.
MSSD FAIL TO DEACT (611) Description: MSSD monitors the solid state output of U1 and driver TY for
proper operation If either one fails in the on position this fault is generated.
When either fails to deactivate when expected this fault is generated. When
the OL2 is 120VAC and the car is idle, terminal SSD should be low.
Troubleshooting:
1. Check terminal SSD wiring.
2. Replace the HC-DVR board.
MSSD FAILED ACTIVE (487) Description: MSSD monitors the solid state output of U1 and driver TY for
proper operation If either one fails in the on position this fault is generated.
Troubleshooting:
Check terminal SSD wiring.
Replace the HC-DVR board.
MTAB INPUT FAILURE (476) Description: The Top Access Bypass Monitor (MTAB) input has detected a
failure of the Top Access Bypass (TAB) or (TABA) outputs.
Troubleshooting:
Verify TAB input is high when top access switch is turned.
Replace the HC-CTL-2 board.
MTD FAIL TO ACT (589) Description: The MTD input monitors the status of the TD triac and the TD
triac driver. When either one fails to activate when expected this fault is
generated.
Troubleshooting:
Check the starter configuration and programming record.
Check motor contactor wiring and voltages at terminal DD1 on the HC-DVR
board.
The TD triac may have failed open. Replace the HC-DVR board.
MTD FAIL TO DEACT (590) Description: The MTD input monitors the status of the TD triac and the TD
triac driver. When either one fails to deactivate when expected this fault is
generated.
Troubleshooting:
Check the starter configuration and programming record.
Check motor contactor wiring and voltages at terminal DD1 on the HC-DVR
board.
The TD triac may have shorted. Replace the HC-DVR board.
MTM FAIL TO ACT (585) Description: The MTM input monitors the status of the TM triac and the TM
triac driver. When either one fails to activate when expected this fault is
generated.
Troubleshooting:
Check the starter configuration and programming record.
Check motor contactor wiring and voltages at terminal M1 on the HC-DVR
board.
The TM triac may have failed open. Replace the HC-DVR board.
Table 5.10 Touch Screen Event Listings
Event Description
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