Model 4700 Maintenance Manual
Section 8. Theory of Operation
Single Traction Motor Trucks >S/N 10676 Item
Connection
Function Description
Theory of Operation
Pinout Matrix Normal Level
Signal Source
Signal User
88
J13-4
PM ENCODER CHANNEL B
Channel B from the Pump Motor (PM) encoder (EN3). If not present, check voltage to the encoder, wiring, and connections.
Approx. 5V running; 0V or 10V static
EN3
PPA
89
J13-5
TERM
Ground from the VM (J34-6) to the Pump Motor (PM) temperature switch (TS2). If not present, check the PPA, wiring, and connections.
Battery voltage wrt BT1+
PPA
TS2
90
J13-6
PM TEMP
Input to the VM (J34-26) from the Pump Motor (PM) temperature switch (TS2). 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 switch, wiring, and connections.
Approx. 0V closed; 9V open
TS2
PPA
91
J13-7 thru 9
NOT USED
92
J15-1
+12V
+12V to the Traction Motor (TM) encoder (EN1) from the TPA (JET-1). If not present, check the TPA, wiring, and connections.
+12V
TPA
EN1
93
J15-2
GND
Ground to the Traction Motor (TM) encoder (EN1) from the TPA (JET-2). If not present, check the TPA, wiring, and connections.
Battery voltage wrt BT1+
TPA
EN1
94
J15-3
TM ENCODER CHANNEL B
Channel B from the Traction Motor (TM) encoder (EN1) to the TPA (JET-5). If not present, check voltage to the encoder, wiring, and connections.
Approx. 5V running; 0V or 10V static
EN1
TPA
95
J15-4
TM ENCODER CHANNEL A
Channel A from the Traction Motor (TM) encoder (EN1) to the TPA (JET-3). If not present, check voltage to the encoder, wiring, and connections.
Approx. 5V running; 0V or 10V static
EN1
TPA
96
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
97
J15-6
TM TEMP SW (TS1)
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
98
J15-7 thru 9
NOT USED
Publication 1160093, Issued: 20 May 2013
8-55
