Section 8. Theory of Operation
Model 5200 High-Level Orderpicker
Pinout Matrix Item #
Connection
Function Description
129
JPT10-4
130
Signal Source
Theory of Operation
Normal Level
B+KEY
Supplies B+KEY to the circuitry on the STM via the over-the-mast cable when the key switch is closed.
Key switch closed = B+ key switch open = 0V
Carriage Manager
STM
JPT10-3
B+ESTOP
Supplies B+ESTOP to the K1 relay coil on the STM via the over-the-mast cable when the EPO switch (S21) is closed. This closes the relay and supplies B+ESTOP Relay to circuits on the STM.
EPO switch closed = B+ EPO switch open = 0V
Carriage Manager
K1 Relay
131
JPT10-1
B–
Supplies B– to the carriage via the over-the-mast cable when the battery is plugged in.
<0.5VDC wrt TP4 (B–)
STM
Carriage Manager
132
JPT9-6
12VP
Supplies 12V from the STM power supply to the Carriage Manager via the over-the-mast cable. The 12V is used to power the CM power supply and supplies voltage to all components using the 11.3VP. If not present, check voltage at STM JPT9-6 and see if IL1 is lit.
Key switch closed = +10.8 to 13VDC
STM
Carriage Manager
133
JPT9-5
DEADMAN2
Output from deadman switch S23 informs Switch Carriage the microprocessor on the STM that the Closed = <1VDC Manager switch is closed and lights IL2 on the STM. Open = 5VDC
STM
134
JPT9-2
DGND
Supplies B– to the carriage via the over-the-mast cable when the battery is plugged in.
<0.5VDC wrt TP4 (B–)
STM
Carriage Manager
135
JPT9-4
TRANSMIT
The wire that carries the communications from the STM to the CM. No usable information can be gained by measuring the voltage on this wire.
No useful voltages are measurable
STM
Carriage Manager
136
JPT9-1
RECEIVE
The wire that carries the communications from the CM to the STM. No usable information can be gained by measuring the voltage on this wire.
No useful voltages are measurable
Carriage Manager
STM
137
JPT9-3
DGND
Supplies B– to the carriage via the over-the-mast cable when the battery is plugged in.
<0.5VDC wrt TP4 (B–)
STM
Carriage Manager
138
JPT6-1
CHA
This is a square wave generated whenever there is movement of the Steer Feedback Encoder. Voltage varies between about 4VDC and about 0VDC as the encoder shaft rotates. The frequency varies directly with the speed of the Steer Motor. The STM uses the quadrature phase relationship between CH A & B to determine direction and speed of Steer Motor.
Voltage should vary between >3VDC to <1VDC as encoder shaft is rotated slowly.
Steer Feedback Encoder
STM
8-24
SignalUser
Publication Number: 1043922B, Revised: 2 Sept 2015
