HARNESS AS-FRONT 5425778 - Caterpillar

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Inside the control panel (PROP)
Relays (13) - Refer to the following list and Illustration 4 for the relays used in the control panel.
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Relay
(5K18) Start/Run/Stop Relay (13A) - (5K24) Shutdown Override Relay (13B) - This relay is only active while the "Local Acknowledge" button is pressed.(5K26) ETS (Energize to Stop) Relay (13C) - (5K28) Energize to Run (ETR) (13D) - This relay is only active while the DCU is starting the engine.(8K9) Expansion Tank Water Level High Temperature Cooling (HTC) Relay (13E) - (12K9) Throttle Select Relay (13F) - (12K10) Local/Remote Sw Enable Relay (13G) - (12K31) Throttle Select Relay (13H) - (12K33) Throttle Select Relay (13J) - (14K16) Start Disable Relay (13K) - (14K17) In Gear Relay (13L) - (14K30) New Alarm Pulse Relay (13M) - (14K33) Unack/Active Faults Relay (13N) - Shutdown Override Switch (14) - This switch overrides all shutdown events except for events configured to be never overridden such as "Overspeed".
(5S16) Manual Start
(5S35) Crank Override
(11S11) Manual Prelube
(14S14) Crank InhibitCrank Override Switch (15) - This switch bypasses all interlocks except the crank inhibit switch. Also, the engine is cranked immediately.Manual Prelube Switch (16) - Crank Inhibit Switch (17) - This switch prevents all crank activity including the crank override switch. All electronics are still powered.Panel Isolation Breaker (Primary) (18) - This breaker isolates the panel from the primary power source of the ship.Panel Isolation Breaker (Secondary) (19) - This breaker isolates the panel from the secondary power source of the ship.Other Breakers (20) - These breakers isolate downstream circuits such as the ECM and auxiliary systems. Refer to the following list and Illustration 5 for the other breakers.
Illustration 5 g06332867
Other breakers
(4Q24) Cabinet Power (Control Panel) breaker (20A)
(4Q25) Engine Controls breaker (20B)
(4Q26) External Power (Remote Start/Stop, Throttle) breaker (20C)
(4Q27) Auxiliary System Power (Prelube, Heater Control) breaker (20D)
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Door inside view (PROP)
(21) SDU
(22) Speed controller switch
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Door inside view (AUX)
Illustration 8 g06332900
SDU status
SDU Status LEDs (green) (23) - Refer to Table 1.
Table 1
Status LED Description
Power Power is present and above the level required by the SDU to operate normally.
Load Reduction Load reduction is active.
Running The engine is running. This is based on the SDU speed sensors, not the DCU or ECM speed sensors.
Tacho 1/2 The speed sensor is configured as active but is faulted.
Shutdown Override The SDU shutdown override switch is closed. All shutdown events that are configured to be overridable are now overridden. (1)
Buzzer The buzzer is active.
Com 1/2/3 The communication port 1, 2, or 3 is active. Com 1 is the DCU link. Com 2 is the Modbus RTU link. Com 3 is the Modbus TCP link.
(1) The SDU does not monitor the DCU shutdown override switch.SDU Active LEDs (red) (24) - Refer to Table 2.
Table 2
SDU Active LED Description
Switch 1 - 8 The switch is closed and configured as a shutdown. (1)
Shutdown Coil The SDU is configured to monitor the shutdown coil for wire-break and there is no coil attached to pins 4 and 5.
Shutdown Override The switch is open currently and the SDU cannot detect