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
401
PPA (W)
PPA (W)
One of three phases from the PPA to the Pump Motor. Voltage is measured between any two phases. If not present, check the PPA, wiring, and connections.
0 to approx. 20VAC; approx. 200A ramping; approx. 250A full lift
PPA
PM
402
TPA B+
B+
B+ from the battery to the TPA through fuse FT. If not present, make sure the battery is connected. Check fuse, wiring, and connections.
B+
J1+
TPA
403
TPA B–
B–
B– from the battery to the TPA. If not present, make sure the battery is connected. Check the wiring and connections.
Battery voltage wrt BT1+
BT1
TPA
404
TPA (U)
TPA (U)
One of three phases from the TPA to the Traction Motor. Voltage is measured between any two phases. If not present, check the TPA, wiring, and connections.
0 to approx. 20VAC; approx. 50A ramping; approx. 35A full speed on jack
TPA
Traction Motor
405
TPA (V)
TPA (V)
One of three phases from the TPA to the Traction Motor. Voltage is measured between any two phases. If not present, check the TPA, wiring, and connections.
0 to approx. 20VAC; approx. 50A ramping; approx. 35A full speed on jack
TPA
Traction Motor
406
TPA (W)
TPA (W)
One of three phases from the TPA to the Traction Motor. Voltage is measured between any two phases. If not present, check the TPA, wiring, and connections.
0 to approx. 20VAC; approx. 50A ramping; approx. 35A full speed on jack
TPA
Traction Motor
407
TPA (UM)
TPA (UM)
One of three phases from the Master TPA to the Right Traction Motor. Voltage is measured between any two phases. If not present, check the TPA, wiring, and connections.
0 to approx. 20VAC; approx. 50A ramping; approx. 35A full speed on jack
TPA
Right Traction Motor
408
TPA (VM)
TPA (VM)
One of three phases from the Master TPA to the Right Traction Motor. Voltage is measured between any two phases. If not present, check the TPA, wiring, and connections.
0 to approx. 20VAC; approx. 50A ramping; approx. 35A full speed on jack
TPA
Right Traction Motor
409
TPA (WM)
TPA (WM)
One of three phases from the Master TPA to the Right Traction Motor. Voltage is measured between any two phases. If not present, check the TPA, wiring, and connections.
0 to approx. 20VAC; approx. 50A ramping; approx. 35A full speed on jack
TPA
Right Traction Motor
Publication 1160093, Issued: 20 May 2013
8-47
