Troubleshooting
6-52 Manual # 42-02-1P21
HC-MPU Battery
The battery sustains volatile information when the power is off. Controller operating parame-
ters are stored in battery backed memory and will not be affected by battery removal as long as
power is applied to the controller. The battery provides 3.3 VDC. If battery voltage falls below
2.2 VDC, the battery should be replaced. If battery replacement is part of a regular maintenance
schedule, we recommend it be replaced every two years.
Replacement:
1. Place the car on Inspection by placing the MODE switch on the HC-CTL (2) board in the
INSP position. DO NOT remove power to the controller as this will cause the HC-MPU
parameters to be reset to default values.
2. On the HC-MPU board, use a non-conductive flat tool to lift the battery tab and slide the
old battery out of the battery holder.
3. Install a new battery on the HC-MPU board.
4. Return the car to service by placing the MODE switch on the HC-CTL (2) board in the
NORM position.
Table 6.15 HC-MPU Board Terminals
Connector Description
J1 Used to program CPU A. IDC connector.
J2 Keyboard Port. Six pin DIN connector.
J3 RS-232 Port A. Nine pin D-sub connector.
J4 External CAN Port. Three pin Weidmuller connector (CAN H, CAN L, SHLD). Signal for CAN
connections outside the controller cabinet.
J5 Internal CAN Port. RJ12 connector/cable to the HC-CHP CAN Hub / Power Supply board.
J6 CPU B Debug Port. Nine pin D-sub connector.
J7 RS-232 Port B. Nine pin D-sub connector.
J8 Used to program CPU B. Fourteen pin header connector.
J9 Low voltage AC input (16V). Two pin IDC connector.
J10 Optional Ethernet Port B. RJ45 connector.
M1 Ethernet Port A. Serial to ethernet conversion device.
Table 6.16 HC-MPU Battery
Type Original Specification
Sanyo CR2032, 3V, Mn D2-Li cell
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