EMCP4.1/EMCP4.2 Caterpillar

Before putting the engine into service, verify the following:

• The desired voltage and frequency are correct at rated engine speed

• Load control devices are functioning properly and have the load isolated from the generator when not running

• If warning events are present, that is, the yellow warning lamp is lit, then take corrective action if necessary

• No shutdown events are active, that is, the red shutdown lamp is not lit

• For remote initiate operation, the EMCP 4 must be in AUTO mode

Engine Starting Sequence

1. The EMCP 4 receives an engine start signal under one of the following conditions:

   • The operator presses the "RUN" key

   • The control is in "AUTO" and the remote initiate input becomes active

   • The operator presses the "AUTO" key and a start command is sent via the RS-485 SCADA Data Link (Modbus).

   • Programmable cycle timer output 1 is "Active"

2. The EMCP 4 checks the following system items before beginning the cranking sequence:

   • There are no shutdowns on any module

   • The engine is stopped

3. The EMCP 4 begins the starting sequence.

   1. The EMCP 4 activates the pre-crank and start aid outputs, if programmed, for the configured duration.

   2. On MUI engines, the EMCP 4 activates the starting motor relay (relay output 1) and the fuel control relay (relay output 2).

   3. On EUI engines that do no utilize a common engine interface, the EMCP 4 activates the starting motor relay (SMR). The start signal is sent to the engine ECM. This signal is sent via the primary CAN data link or through a hardwired connection.

   4. On EUI engines that utilize a common engine interface, the EMCP 4 will send a start signal to the Engine ECM via the CAN data link or through a hardwired connection and the ECM will be responsible for cranking the engine (step 4) and deactivating the starting motor relay (step 5).

4. The EMCP 4 cranks the engine for the programmed crank time or until the engine starts. If the engine does not start after the crank time has elapsed, then the starting motor relay will de-energize for the programmed rest time. After the rest time has elapsed, then the starting motor relay will start cranking again for the programmed crank time.

   A cycle consists of a crank time and a rest time. If the engine has not started after the programmed number of cycles, then the EMCP 4 will abort the starting process. The EMCP 4 will then generate an "Engine Failure to Start Shutdown".

5. The EMCP 4 deactivates the starting motor relay when the engine speed reaches the setpoint for the crank terminate speed.

Engine Stopping Sequence

1. The EMCP 4 will stop the engine under either of the following conditions:

   1. The operator presses the "STOP" key.

   2. If the control is in "AUTO", and no longer receives any of the following:

      • the remote initiate input

      • the SCADA start signal

      • programmable cycle timer output 1

      Note: If the control is in "AUTO", the remote initiate must be inactive, and the Modbus data link must be requesting a stop. If either the remote initiate is active, then the engine will not stop. Remote initiates are as follows:

      • Engine run state is being requested via the Modbus

      • PCT output 1 is active

2. After receiving the "Stop" signal, the EMCP 4 checks to ensure that there are no system faults present.

3. The EMCP 4 begins the cooldown period. In order to bypass the cooldown, depress and hold the "STOP" key. The screen displays instructions to "PRESS ENTER TO BYPASS", and "PRESS ESCAPE TO CONTINUE". Press the "OK" key in order to bypass the cooldown sequence or press the Escape key in order to continue the cooldown sequence.

   Note: For common engine interface applications, cooldown must be controlled by the Engine ECM.

4. After the cooldown cycle, the EMCP 4 initiates an engine shutdown by turning off the fuel supply.

   1. On the MUI engines, the EMCP 4 deactivates the fuel control relay, which shuts down the engine.

   2. On EUI engines, the EMCP 4 sends a shutdown signal to the engine ECM over the primary CAN data link to shut down the engine.