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2.5.4.2 Microprocessor / Stepper Module (MSM)
The Microprocessor/Stepper Module (MSM) houses the main microprocessor and the operating processor
for the CCMV, EVXV and ECXV. The module is totally self-contained and does not contain any serviceable
components.
2.5.4.3 Micro / Stepper Status LED
Microprocessor activity within the Microprocessor / Stepper module or Power Module (PM) can be deter-
mined by observing the status LEDs, located just to the right of the module bar code on the MSM or inside
the PM.
The LED indicates the following:
• Flashing Green = Normal Operation / Communication Sync OK
• Solid Green = Unit OK but Communication Sync Lost
• Flashing Red/Green = Sending/Receiving Communication
• Flashing Red = Unit Failure but Communication Sync OK
• Solid Red = Internal Failure or Loss of Software
• NO LED = No Power
2.5.4.4 Contactor Control Board (CT)
The contactor control board (1CCB - see Figure 2.4) is a slave board that contain the necessary software
to control the contactors in accordance with the unit model programmed into the main microprocessor. The
board communicates with the control system through the CAN network.
2.5.4.5 AC Current Transformer
The current transformer (CT2, CT3 and CT4, Figure 2.4) provides a reading of each individual AC line cur-
rent draw (amps) to the main microprocessor through the CAN bus (see schematic diagram, Section 10).
2.5.4.6 High Voltage Transformer (HVT)
The high voltage transformer (Figure 2.4) provides a reading of line voltage to the main microprocessor
through the CAN bus (see schematic diagram, Section 10).
2.5.4.7 Engine Control Unit (ECU)
The ECU (Figure 2.2) is a microprocessor based unit which controls the operation of the engine. The ECU
communicates with the control system through the CAN network and sends information on engine speed,
oil pressure and coolant temperature to the control system to be displayed in the Advanced User Unit Data
and recorded in the data recorder. The ECU also communicates with the main microprocessor to control
overall system balance. The ECU is mounted on the frame near the fuel filter.
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