GEAR ASSEM. (10 teeth) 3H3378 - Caterpillar

DANGER: Shock/Electrocution Hazard-Do not operate this equipment or work on this equipment unless you have read and understand the instructions and warnings in the Operation and Maintenance Manual. Failure to follow the instructions or heed the warnings will result in serious injury or death.
Personal injury or death can result from high voltage.When power generation equipment must be in operation to make tests and/or adjustments, high voltage and current are present.Improper test equipment can fail and present a high voltage shock hazard to its user.Make sure the testing equipment is designed for and correctly operated for high voltage and current tests being made.When servicing or repairing electric power generation equipment:
Make sure the unit is off-line (disconnected from utility and/or other generators power service) , and either locked out or tagged DO NOT OPERATE.
Remove all fuses.
Make sure the generator engine is stopped.
Make sure all batteries are disconnected.
Make sure all capacitors are discharged.Failure to do so could result in personal injury or death. Make sure residual voltage in the rotor, stator and the generator is discharged.
Accidental engine starting can cause injury or death to personnel working on the equipment.To avoid accidental engine starting, disconnect the battery cable from the negative (−) battery terminal. Completely tape all metal surfaces of the disconnected battery cable end in order to prevent contact with other metal surfaces which could activate the engine electrical system.Place a Do Not Operate tag at the Start/Stop switch location to inform personnel that the equipment is being worked on.
The voltage regulator is located in the enclosure for the control panel.Integrated Voltage Regulator (IVR)
The Integrated Voltage Regulator (IVR) provides excitation current to the generator. The IVR is controlled by the IVR function in the EMCP4. The IVR function allows the EMCP4 to control the generator voltage, optimize transient performance, and provide feature specification.The excitation module may interface with any of the following excitation systems: Self Excitation (SE), Internal Excitation (IE) and Permanent Magnet (PMG) excitation systems.For additional information about the IVR, see Application and Installation, LEBE0006, and Special Instruction, REHS9106.
Illustration 1 g03844853
Excitation Module 10 (EM10)
(1) Connector P3
(2) Connector P2
(3) Connector P4EMCP IVR Connection
To regulate the generator terminal voltage, the EMCP communicates the desired excitation command to the excitation module through a pulse width modulation (PWM) signal. A twisted pair of shielded cable must be used for the communication link. Table 1 details the connections to be made between the EMCP and Excitation Module.
Table 1
EMCP 4.1 and EMCP 4.2 Connections to Excitation Module (70-pin connector)
EMCP 4.1 and EMCP 4.2 70-Pin Connector Excitation Module 3-Pin Connector
Digital Output #2 / IVR CS+ 68 CS+ P3-2
Battery negative splice 60 or 65 CS- P3-3
Battery negative splice 60 or 65 Shield P3-1
EMCP 4.3 and EMCP 4.4 Connections to Excitation Module (120-pin connector)
EMCP 4.3 and EMCP 4.4 120-Pin Connector Excitation Module 3-Pin Connector
PWM Output #2 Positive 28 CS+ P3-2
PWM Output #2 Negative 8 CS- P3-3
Shield 19 Shield P3-1 Table 2 provides information on the technical specification of the EM10 and EM15 modules. Selection of the appropriate module must be