4N5903 CORE ASSEM. Caterpillar parts
955K, 955L
Rating:
Alternative (cross code) number:
CA4N5903
4N-5903
4N5903
CA4N5903
4N-5903
4N5903
Weight: 60 pounds 27 kg.
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This part in 5 request:
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2023-04-24
2020-12-30
2017-11-17
2017-11-17
2017-11-17
Number on catalog scheme:
7
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Information:
Panel Does Not Power Up
The following are symptoms when the panel does not have power:
Engine does not start
SDU lights are not on
DCU is not onUse the following tasks to address this issue.
Check to see if the panel isolation breakers have been tripped.
Check power at the customer supplied power terminals. Ensure that the primary and secondary power lines at X1.1:1 and X1.1:3 have 24V (+). Ensure that X1.1:2 and X1.1:4 have 0V.
Check power at customer provided power lugs in Power Distribution box.
Check voltage from the ship power supply. Checking voltage includes checking wiring and circuit breakers.
Check the connectors on the back of the Digital Control Unit (DCU). Ensure that the connectors are pushed securely and the screw terminals are tightened. Ensure that the panel wiring is correct.
Check the panel wiring at the Engine Control Switch (ECS).
Check that the 4Q24 circuit breaker is closed. Ensure that the wiring is not damaged or disconnected.Note: The 4Q24 circuit breaker provides power to the DCU.Local Control Panel Does Not Start or Fully Shut Down Engine
Use the following checks if the engine will not start or fully shut down from the local control panel.
Check the status bar and alarm list for any alarms that have not been acknowledged. Refer to Troubleshooting Guide, M0096721, General Information.
Ensure that the physical E-Stop button is not depressed. Ensure that the remote E-Stop is not engaged.
Check that the ECS is in "Local" mode.Note: Starting from the panel is disabled if the ECS is in "Remote" mode.
Ensure that the Crank Inhibit Switch is disabled. If enabled, the status bar will display "Start Disabled".
Check that all active shutdown alarms have been acknowledged and cleared.Note: Shutdown events must be acknowledged and cleared before the engine will be allowed to start.
Check for interlocks preventing the engine from starting. There are two types of interlocks that can prevent the engine from starting. The interlocks are either programmed or physical.
Check that there are no programmed engine or transmission interlocks preventing start (such as neutral inhibit) on the "Start Conditions" screen of the DCU.
Check the "Hold Button to Start/Stop" setting if the engine attempts to start but then stops or does not fully shut down.
A dialog box will appear on the DCU if this setting is configured. The dialog box displays "Are you sure you want to start/stop the engine?". Check the "Hold Button to Start/Stop" option under the DCU "Start/Stop/Prelube" setting in the web tool. Refer to the Programming Guide, LEBM0063, "Cat A&P Controls Programming Guide".
Check the panel and engine wiring. In the panel, check the Crank Inhibit Switch wiring. Check the crank output between the DCU and remote start.Note: The remote start is for the engine ECM start command.The issue is outside of the panel if +24V is present on C-1:29 while the DCU indicates cranking. Check the E-Stop for damaged or unplugged wiring to the engine.
Use the following steps if the engine does not start and the DCU displays "Engine Start Failed":
Attempt an engine restart and monitor engine speed on the DCU.
Check the
The following are symptoms when the panel does not have power:
Engine does not start
SDU lights are not on
DCU is not onUse the following tasks to address this issue.
Check to see if the panel isolation breakers have been tripped.
Check power at the customer supplied power terminals. Ensure that the primary and secondary power lines at X1.1:1 and X1.1:3 have 24V (+). Ensure that X1.1:2 and X1.1:4 have 0V.
Check power at customer provided power lugs in Power Distribution box.
Check voltage from the ship power supply. Checking voltage includes checking wiring and circuit breakers.
Check the connectors on the back of the Digital Control Unit (DCU). Ensure that the connectors are pushed securely and the screw terminals are tightened. Ensure that the panel wiring is correct.
Check the panel wiring at the Engine Control Switch (ECS).
Check that the 4Q24 circuit breaker is closed. Ensure that the wiring is not damaged or disconnected.Note: The 4Q24 circuit breaker provides power to the DCU.Local Control Panel Does Not Start or Fully Shut Down Engine
Use the following checks if the engine will not start or fully shut down from the local control panel.
Check the status bar and alarm list for any alarms that have not been acknowledged. Refer to Troubleshooting Guide, M0096721, General Information.
Ensure that the physical E-Stop button is not depressed. Ensure that the remote E-Stop is not engaged.
Check that the ECS is in "Local" mode.Note: Starting from the panel is disabled if the ECS is in "Remote" mode.
Ensure that the Crank Inhibit Switch is disabled. If enabled, the status bar will display "Start Disabled".
Check that all active shutdown alarms have been acknowledged and cleared.Note: Shutdown events must be acknowledged and cleared before the engine will be allowed to start.
Check for interlocks preventing the engine from starting. There are two types of interlocks that can prevent the engine from starting. The interlocks are either programmed or physical.
Check that there are no programmed engine or transmission interlocks preventing start (such as neutral inhibit) on the "Start Conditions" screen of the DCU.
Check the "Hold Button to Start/Stop" setting if the engine attempts to start but then stops or does not fully shut down.
A dialog box will appear on the DCU if this setting is configured. The dialog box displays "Are you sure you want to start/stop the engine?". Check the "Hold Button to Start/Stop" option under the DCU "Start/Stop/Prelube" setting in the web tool. Refer to the Programming Guide, LEBM0063, "Cat A&P Controls Programming Guide".
Check the panel and engine wiring. In the panel, check the Crank Inhibit Switch wiring. Check the crank output between the DCU and remote start.Note: The remote start is for the engine ECM start command.The issue is outside of the panel if +24V is present on C-1:29 while the DCU indicates cranking. Check the E-Stop for damaged or unplugged wiring to the engine.
Use the following steps if the engine does not start and the DCU displays "Engine Start Failed":
Attempt an engine restart and monitor engine speed on the DCU.
Check the
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