Model 6210 Maintenance Manual
Section 8.Theory of Operation Pinout Matrix
Pinout Matrix
4. Theory of Operation:
The pinout matrix chart lists functions and normal voltages of terminals and harness connector pins. The matrix columns have the following meanings: 1. Item #: sequential number to aid in reference. 2. Connection: the actual wire numbers or component abbreviations on the electrical schematic. Refer to the schematic package for these trucks. 3. Function Description: brief definition of the connection.
a. A detailed description of the connection. If the voltage is variable, it indicates the state of a related component causing the voltage to vary. b. Identifies possible causes for lack of correct voltage. 5. Normal Level: the approximate voltage that should be seen on the wire for the state indicated. Unless otherwise indicated, voltages are measured with respect to (wrt) B– at TP4. 6. Voltage Source: the device or connection that supplies the voltage directly to the wire. 7. Voltage User: the device or connection that the wire directly delivers the voltage to.
Functional Description
Voltage Source
Voltage User
B+
M1 Contactor
TA
B– from the battery. It is used for all the internal power and control circuits on the TA, VM, Pump Motor, SW2, Service Port, and Battery Charger.
< 0.5 VDC wrt B–
Battery
VM, SW2, TA, Pump Motor, Service Port, and Battery Charger
B+ Key Input
Provides B+ through fuse FU2 and SPL4 when the Key Switch (SW1) is closed. It is used to power the control circuits of the TA. It is also used by the TA to produce 5 and 12VDC.
With Key Switch OFF: 0VDC With Key Switch ON: 24VDC
Key Switch (SW1)
TA
Prop Lower
Control path for the Proportional Lower Solenoid SOL-2. Voltage present during lower depends on the lower request from VR2 (Model 6210 only).
De-energized: B+ Lower Request: Varies proportionally from 24VDC to 0VDC at full lower.
TA
SOL-2
Item
Connection
Theory of Operations
1
TA B+
B+ Power to Traction Amplifier
B+ from MPC to Traction Amp used to produce the AC phases U, V, and W when the MPC contactor is closed to power the Traction Motor.
2
TA B–
B– from Battery
3
JP1-1
4
JP1-2
Publication: 1146947, Revised: 12 Jan 2017
Normal Level
8-9
