Troubleshooting
6-24 Manual # 42-02-1P21
MABGF INPUT FAILURE (CTLB)
Description: The Front Access Gate Bypass Monitor (MABGF) input has detected a failure of the
Access Bypass Gate A (ABGA) or Front Access Bypass Bottom (FABB) outputs.
Troubleshooting:
1. Temporarily disconnect then reconnect the CAN connection to the HC-CTL-2 board to reset the
microprocessors.
2. Verify that SPA, SPB, and SPC LEDs are all lighted.
3. If this failure occurred while updating software, refer to the update instructions and repeat the
process.
MABGR INPUT FAILURE (RDRB)
Description: The Rear Access Gate Bypass Monitor (MABGR) input has detected a failure of the
Rear Access Bypass Gate A (ABGAR) or Rear Access Bypass (RABA) outputs.
Troubleshooting:
1. Temporarily disconnect then reconnect the CAN connection to the HC-CTL-2 board to reset the
microprocessors.
2. Verify that SPA and SPB LEDs are lighted.
3. If this failure occurred while updating software, refer to the update instructions and repeat the
process.
MABT INPUT FAILURE (CTLB)
Description: The Top Access Bypass Monitor (door close contacts) (MABT) input monitors proper
operation of the solid state devices associated with bypassing the top hoistway door contacts dur-
ing access operation.
Troubleshooting: Remove the car from access operation and verify that test point TP33 (MABT)
on the HC-CTL board is low with respect to 1 bus.
MABTR INPUT FAILURE
Description: The Top Rear Access Bypass Monitor (MABTR) input monitors proper operation of the
solid state devices associated with bypassing the top rear hoistway door contacts during access
operation.
Troubleshooting: Remove the car from access operation and verify that test point (MABTR) on
the HC-CTL-2 board is low with respect to 1 bus.
MACHINE ROOM INSPECTION (CTLA)
Description: The controller is currently in MACHINE ROOM inspection operation.
MBAB INPUT FAILURE (CTLB)
Description: The Bottom Access Bypass Monitor (door lock contacts) (MBAB) input has detected a
failure of the Bottom Access Bypass (BAB) or (BABA) outputs or the BAB1 input.
Troubleshooting:
1. Check the wiring at HC-CTL-2 board terminal BAB1.
MCSB INPUT FAILURE (CTLA)
Description: The Car Stop Bypass Monitor (MCSB) input on the HC-CTL board is active while the
car stop bypass circuit is not active.
Troubleshooting:
1. Verify wiring and connections at ESC and SAFC.
2. Temporarily disconnect then reconnect the CAN connection to the HC-CTL board to reset the
microprocessors.
3. Verify that SPA, SPB, and SPC LEDs are all lighted.
4. If this failure occurred while updating software, refer to the update instructions and repeat the
process.
Table 6.1 Status and Error Messages
Scrolling Message - Special Event Message
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