3516C Locomotive Engines Selective Catalytic Reduction Caterpillar

Diesel Exhaust Fluid (DEF) dosing control cabinet

(1) Engine harness

(2) Main DEF tank harness

(3) CEM harness

(4) Power to cabinet

(5) DEF to injector

(6) Air to injector

(7) Air supply to cabinet

(9) DEF return to main tank

Control Cabinet interior

(1) Connector A-C9 (J1)

(2) Connector A-C1 (J2)

(3) SCR system ECM

(4) Cabinet air temperature sensor

(5) Power converter

(6) Local CAN resistor

(7) DEF pump heater

(8) Global CAN resistor

Detail view front of control cabinet

(1) DEF tank heater breaker

(2) Pump breaker

(3) Terminal block (AC power)

(4) Terminal block (AC power)

(5) Terminal block (ground)

(6) DEF pressure sensor

(7) Air assist pressure sensor

(8) DEF main tank return valve (solenoid)

(9) DEF main tank return valve (pneumatic)

(10) DEF manifold heater

(11) DEF manifold

(12) DEF manifold temperature sensor

(13) Air pressure regulator

(14) Air assist valve (solenoid)

(15) Relay for DEF manifold heater

(16) Connector for CEM (A-C3)

(17) Connector for engine (A-C2)

(18) Connector for tank (A-C13)

(19) Relay for electrical supply side of heated DEF line

Top side view

(1) Pressure measurement location (after DOC)

(2) Pressure measurement location (before DOC)

(3) Temperature measurement location (Outlet #2)

(4) NOx measurement location (Outlet #2)

(5) Temperature measurement location (Intake #2)

(6) NOx measurement location (Intake)

(7) Temperature measurement location (Intake #1)

(8) Pressure measurement location (after DOC)

(9) Pressure measurement location (before DOC)

(10) Temperature measurement location (Outlet #1)

(11) NOx measurement location (Outlet #1)

(12) Intake #1 NOx sensor assembly

(13) Outlet #2 NOx sensor assembly

(14) Outlet #1 NOx sensor assembly

(15) Sensor assembly for temperatures and differential pressure