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
150
J15-2
GND
Single Traction Motor Truck Ground to the Traction Motor (TM) encoder (EN1) from the TPA (JT6-2). If not present, check the TPA, wiring, and connections.
Battery voltage wrt BT1+
TPA
EN1
151
J15-3
RTM ENCODER CHANNEL B
Dual Traction Motor Truck Channel B from the Right Traction Motor (RTM) encoder (EN1) to the TPA (JCT-14). If not present, check voltage to the encoder, wiring, and connections.
Approx. 5V running; 0V or 10V static
EN1
TPA
152
J15-3
TM ENCODER CHANNEL B
Single Traction Motor Truck Channel B from the Traction Motor (TM) encoder (EN1) to the TPA (JT6-5). If not present, check voltage to the encoder, wiring, and connections.
Approx. 5V running; 0V or 10V static
EN1
TPA
153
J15-4
RTM ENCODER CHANNEL A
Dual Traction Motor Truck Channel A from the Right Traction Motor (RTM) encoder (EN1) to the TPA (JCT-13). If not present, check voltage to the encoder, wiring, and connections.
Approx. 5V running; 0V or 10V static
EN1
TPA
154
J15-4
TM ENCODER CHANNEL A
Single Traction Motor Truck Channel A from the Traction Motor (TM) encoder (EN1) to the TPA (JT6-3). If not present, check voltage to the encoder, wiring, and connections.
Approx. 5V running; 0V or 10V static
EN1
TPA
155
J15-5
GND
Ground from the VM (J34-6) to the TM temperature switch (TS1). If not present, check the VM, wiring, and connections.
Battery voltage wrt BT1+
VM
TS1
156
J15-6
RTM TEMP SW (TS1)
Dual Traction Motor Truck Input to the VM (J34-26) from the RTM temperature switch (TS1). Input will be low under normal operating conditions. If overtemp condition exists [>266°F (130°C)], input will be high. Allow to cool. If still open (high), check the switch, wiring, and connections.
Approx. 0V closed; 5V open
TS1
VM
157
J15-6
TM TEMP SW (TS1)
Single Traction Motor Truck Input to the VM (J34-27) from the TM temperature switch (TS1). Input will be low under normal operating conditions. If overtemp condition exists [>266°F (130°C)], input will be high. Allow to cool. If still open (high), check the switch, wiring, and connections.
Approx. 0V closed; 5V open
TS1
VM
Publication 1160093, Issued: 20 May 2013
8-25
