Model 4700 Maintenance Manual

Section 8.Theory of Operation

All Dual Traction Motor Trucks and Single Traction Motor Trucks <S/N10677Pinout Matrix

37JCT-3 +V KEYB+ from Key switch (SW1). Used by the TPA to determine BSOC. If not present, check the Key switch, wiring, and connections.

38JCT-4 +V OUTB+ from TPA to Seat switch (SW2) and optional Battery Interlock switch (SW30). If not present, check the TPA, wiring, and connections.

39JCT-5 SEAT Input from the Seat switch (SW2). If not present, check the seat switch, battery interlock switch (SW30), jumper, wiring, and connections.

40JCT-6 thru 10NOT USED

41JCT-11 +12V +12V to the Left Traction Motor (LTM) encoder (EN2). If not present, check the TPA, wiring, and connections.

42JCT-12 GND Ground to the Left Traction Motor (LTM) encoder (EN2). If not present, check the TPA, wiring, and connections.

43JCT-13 RTM ENCODER CHANNEL A Channel A from the Right Traction Motor (RTM) encoder (EN1). If not present, check voltage to the encoder, wiring, and connections.

44JCT-14 RTM ENCODER CHANNEL B Channel B from the Right Traction Motor (RTM) encoder (EN1). If not present, check voltage to the encoder, wiring, and connections.

45JCT-15 GND POTGround from the TPA to the Steer pot (P1). If not present, check the TPA, wiring, and connections.

Approx. 5V running; 0V or 10V static

Approx. 5V running; 0V or 10V static

Battery voltage wrt BT1+

+12V

47JCT-17 C POT Input from the Steer pot (P1) to the TPA. If not present, check the Steer pot (P1), wiring, and connections.

48JCT-18 thru 21NOT USED

49JCT-22 LTM ENCODER CHANNEL A Channel A from the Left Traction Motor (LTM) encoder (EN2). If not present, check voltage to the encoder, wiring, and connections.

P1TPA

EN2TPA Item Connection Function Description Theory of Operation Normal Level Signal Source Signal User

Publication 1160093, Issued: 20 May 2013 8-17

Section 8.Theory of Operation

Model 4700 Maintenance Manual

Pinout MatrixAll Dual Traction Motor Trucks and Single Traction Motor Trucks <S/N10677

50JCT-23 LTM ENCODER CHANNEL B Channel B from the Left Traction Motor (LTM) encoder (EN2). If not present, check voltage to the encoder, wiring, and connections.

51JCT-24 and 25NOT USED

52JCT-26 –V COILVoltage from the TPA to CT3 coil (J50-8). If not present, check the TPA, wiring, and connections. Approx. 32ohms across coil.

53JCT-27 +V COILVoltage from the TPA to CT3 coil (J50-7). If not present, check the TPA, wiring, and connections. Approx. 32ohms across coil.

54JCT-28 and 29NOT USED

55JCT-30 +V AUX COILVoltage from the TPA to Relay 1 (RL1 at J51-1) coil. If 36V battery, RL1 stays de-energized. If 48V battery, RL1 is energized to allow 12V drop across R3, providing 36V to CT1. If not present, check the TPA, wiring, and connections. Approx. 1K ohm across coil.

56JCT-31 –V AUX COILVoltage from the TPA to RL1 coil (J51-5). If not present, check the TPA, wiring, and connections. Approx. 1Kohm across coil.

57JCT-32 thru 35NOT USED

58JDP-1 +12V +12V to the Pump Motor (PM) encoder (EN3). If not present, check the PPA, wiring, and connections.

59JDP-2 GND Ground to the Pump Motor (PM) encoder (EN3). If not present, check the PPA, wiring, and connections.

60JDP-3 PM ENCODER CHANNEL A Channel A from the Pump Motor (PM) encoder (EN3). If not present, check voltage to the encoder, wiring, and connections.

61JDP-4 NOT USED

62JDP-5 PM ENCODER CHANNEL B Channel B from the Pump Motor (PM) encoder (EN3). If not present, check voltage to the encoder, wiring, and connections.

63JDP-6 NOT USED

64JEP-1 thru 3NOT USED

Approx. 5V running; 0V or 10V static

EN2TPA

Approx. B+ to energize coil; drops to approx. 14V for holding wrt B+

TPACT3

B+ TPACT3

0V with 36V battery; 24V with 48V battery wrt

JCT-31

TPA RL1

0V with 36V battery; 24V with 48V battery wrt B+

+12V

Battery voltage wrt BT1+

Approx. 5V running; 0V or 10V static

TPA RL1

PPAEN3

PPAEN3

EN3PPA

Approx. 5V running; 0V or 10V static

EN3PPA

Publication 1160093, Issued: 20 May 2013