Model 4700 Maintenance Manual
Section 8. Theory of Operation
All Dual Traction Motor Trucks and Single Traction Motor Trucks <S/N 10677 Item
Connection
Function Description
Theory of Operation
Normal Level
Pinout Matrix Signal Source
Signal User
281
J46-1
+24V
+24V to optional 5th Function switch (PB5) from fuse F7. If not present, check fuse, wiring, and connections.
+24V
DC/DC Converter
PB5
282
J46-2
5TH SOLENOID (optional)
When switch (PB5) is closed, voltage is allowed to pass to optional 5th Solenoid Valve (EV11). If not present, check switch, wiring, and connections.
+24V
PB5
EV11
283
J47-1
GND
One of the grounds supplied by the VM (J40-6) to Lowering switch (SW15). If not present, check VM, wiring, and connections.
Battery voltage wrt BT1+
VM
SW15
284
J47-2
NOT USED
285
J47-3
AUX IN 1
Input to VM (J40-13) from the Lowering switch (SW15). If not present, check switch, wiring, and connections.
Approx. 5V open; 0V closed
SW15
VM
286
J47-4
NOT USED
287
J70+
AUX OUT 1
Output from VM (J40-16), through fuse F10, to the optional Travel Alarm (BZ1). If not present, check VM, fuse, wiring, and connections. Note: Option must be enabled in FlashWare.
+24V
VM
BZ1
288
J70–
GND
B– supply to optional Travel Alarm (BZ1). This B– is shared by many components prior to and after the VM. If not present, follow back towards B– until loss can be determined.
Battery voltage wrt BT1+
B– at J1–
BZ1
289
J71-1
GND
B– supply to Power Amplifier Fan. This B– is shared by many components prior to and after the fan. If not present, follow back towards B– until loss can be determined.
Battery voltage wrt BT1+
B– at J1–
Power Amp Fan
290
J71-2
+24V
+24V to the Power Amplifier Fan from fuse F5. If not present, check fuse, wiring, and connections.
+24V
DC/DC Converter
Power Amp Fan
291
J71-3
FAN DRIVE
Output from the VM (J40-2) to the Power Amp Fan (FN1). If not present, check VM, wiring, and connections. Should be present within a minute of turning Key switch ON.
Approx. 5V On; 0V Off
VM
Power Amp Fan
292
J71-4
NOT USED
Publication 1160093, Issued: 20 May 2013
8-37
