FRAME AS-UNDERCARRIAGE 4889283 - Caterpillar

Locomotive Power Connector "F"
The use of a power supply that is not isolated may result in failure of the electronic control module (ECM).The ECM must be powered by isolated power only.
Note: The Locomotive OEM is responsive for ensuring that the isolated power supply is provided.Connector "F" (37) provides 24 DCV to the junction box. Power is provided to the ECM, the service connector, and the Caterpillar Monitoring System. This connector is also for variable voltage that may be needed by systems that support the engine operation. Examples of the systems for support include ether, prelube, and relays for starting the engine.
Table 5
Locomotive Applications - Customer Connector "F"
Pin Number Function Type
1 Unassigned
2 Power Minus +Battery
3 Battery Positive +Battery
4 Unassigned
5 Battery Negative −Battery
6 Power Plus +Battery Customer Connector "G"
Connector "G" (36) is the primary interface between the locomotive control and the engine. Connector "G" provides the interface for the items that are listed below.
Shut down notify relay
Start enable relay
General alarm relay
Throttle
Fuel position multiplier
Feedback for the load
Serial data links
A speed signal that is independent of the engine ECM
Communication with the engine ECM for the remote emergency shutdown and normal engine shutdown
Engine protection override switch
Table 6
Locomotive Applications - Customer Connector "G"
Pin Number Function
1 Start Enable
2 Start Enable
3 Emergency Shutdown C
4 Engine Shutdown
5 Start Enable
6 Engine Shutdown
7 Emergency Shutdown D
8 General Alarm
9 Global CAT Link + (not used)
10 Shield
11 CAN −
12 CAN +
13 General Alarm
14 Local CAT Data Link (−)
15 Shutdown Notify (COM)
16 Shutdown Notify (NC)
17 Shutdown Notify (NO)
18 General Alarm (COM)
19 Load Feedback
20 - 23 Not Used
24 Torque Limit
25 Global CAT Data Link (−)
26 Not Used
27 Local CAT Data Link (+)
28 Not Used
29 Throttle
30 Magnetic Pickup (+)
31 Magnetic Pickup (−)
32 Shield
33 - 36 Not Used
37 Digital Reference