Model 9600/9700 Swing-Reach ® Lift Truck
Section 8. Theory of Operation Pinout Matrix
Function Description
Voltage Source
Voltage User
K3
LPA
Control path for the LPC. The LPA supplies B– for the contactor by way of the B– terminal.
LPC deLPA energized: B+ energized: 26V
LPC
L VEL SENSOR–
B– for the Lift Motor Encoder (LME). It also provides B– to the Lift Motor Temp (LMT) sensor.
Measure B+ at TP1 to verify connections. Then check for <0.5V wrt TP4.
LME
LPA
JPLA1-8
L TEMP+
Input from the Lift Motor Temperature (LMT) sensor. Voltage will vary with lift motor temperature. Used by the LPA to adjust lift motor performance.
Approx. 1V @ 75°F (24°C)
LMT
LPA
127
JPLA1-11
ID0
B+ to the LPA when K3 tips energize. It is used as an identifier to determine correct connection.
K3 energized: B+
K3
LPA
128
JPLA1-13
LPC SUPPLY (B+K3)
B+ supply to the LPC from the LPA.
B+
LPA
LPC
129
JPLA1-23
BUS0+
Positive component of the digital communications between the TPA, LPA, TM, and GM.
2.3V
TM
TPA, LPA, TM, GM
130
JPLA1-26
L VEL SENSOR +
5V supply to the LME. This voltage is produced by the LPA from B+K3.
4.75 to 5.25V
LPA
LME
131
JPLA1-31
L VEL PHASE A
Input from the Lift Motor Encoder (LME). It is a square wave that is either high (>3V) or low (<1V). The frequency varies directly with motor speed. Identical to L VEL Phase B except for phase. The LPA uses the relationship between phases to determine lift and lower speed.
Motor Stopped: >3 or <1V Motor Turning: approx. 2.3V
LME
LPA
132
JPLA1-32
L VEL PHASE B
Input from the Lift Motor Encoder (LME). It is a square wave that is either high (>3V) or low (<1V). The frequency varies directly with motor speed. Identical to L VEL Phase A except for phase. The LPA uses the relationship between phases to determine lift and lower speed.
Motor Stopped: >3 or <1V Motor Turning: approx. 2.3V
LME
LPA
133
JPLA1-35
BUS0–
Negative component of the digital communications between the TPA, LPA, TM, and GM.
2.3V
TM
TPA, LPA, TM, GM
134
JPS4-5
BUS0–
Negative component of the digital communications between the TM and GM.
2.3V
TM
GM
Theory of Operations
Normal Level
Item
Connection
123
JPLA1-1
B+K3
B+ to the LPA when K3 is energized.
K3 energized: B+
124
JPLA1-6
LPC CONTACTOR
125
JPLA1-7
126
Publication: 1089040, Issued: 08 Apr 2016
8-27
