Model 4700 Maintenance Manual
Section 8. Theory of Operation
Single Traction Motor Trucks >S/N 10676 Item
Connection
Function Description
Pinout Matrix
Theory of Operation
Normal Level
Signal Source
Signal User
272
J117-1
DRAIN
Voltage from the HCB (JCM-19) to turn on the Drain Solenoid (EVP). If not present, check the HCB, wiring, and connections.
Approx. 2.5V static; Approx. 2 to 13V wrt J117-2 when lifting or performing an aux function (approx. 18 ohms across coil)
HCB
EVP
273
J117-2
+V
Voltage from the HCB (JCM-20) to turn on the Drain Solenoid (EVP). If not present, check the HCB, fuse F21, wiring, and connections.
Approx. B+ when lifting or performing an aux function
HCB
EVP
274
J119-1
+V
Voltage is supplied to the optional Lift Limit Bypass solenoid when SW16 is normally closed. When SW16 opens, the Lift-Limit Bypass button PB9 must be depressed to allow lift. If not present, check wiring, fuse, switches, and connections.
+24V
SW16, PB9
EV12
275
J119-2
B–
B– supply from Battery. This B– is used by the optional Lift-Limit Bypass Valve (EV12). If not present, follow back towards B– until loss can be determined.
Battery voltage wrt BT1+
BT1
EV12
276
J137-1
CAN L
Communication line between Operator Display and VM (J34-21).
N/A
VM
Operator Display
277
J137-2
CAN H
Communication line between Operator Display and VM (J34-33).
N/A
VM
Operator Display
278
J137-3
GND
B– supply from Battery. This B– is used by the Operator Display. If not present, follow back towards B– until loss can be determined.
Battery voltage wrt BT1+
BT1
Operator Display
279
J137-4
NOT USED
280
J137-5
+V
+24V supply to Operator Display from the VM (J34-12). If not present, check fuse F14, wiring, and connections.
+24V
VM
Operator Display
281
J137-6
GND
B– supply from Battery to the Operator Display. This connection supplies B– to the CAN-Bus Interface by use of a jumper. If not present, follow back towards B– until loss can be determined.
Battery voltage wrt BT1+
BT1
Operator Display
Publication 1160093, Issued: 20 May 2013
8-71
