Toyota Orderpicker Model
7BPUE
15 Service Manual Section 5. Troubleshooting
Definitions
Continuity
A continuous and uninterrupted path between
two or more locations in an electrical circuit,
typically having a resistance of less than 1 ohm.
Deadman Switches
The switches in the truck that must be closed to
allow truck operation. The Orderpicker Model
7BPUE15 has two deadman switches under the
deadman pedal. Both switches must be
functional for the truck to travel, lift or steer.
Stepping on the pedal on the operator platform
activates these switches. The
deadman function
acts to protect against travel while the brake is
applied.
M3 and M4 Accel Rate
The time necessary to reach full output (PWM)
from zero output in M3 or M4 (high speed,
PMC
-
3 on) mode. See Table 5
-
7 on page 5
-
24.
M3
and M4 Max Speed
Maximum speed (PWM duty factor) in M3 or
M4
(high speed) mode.
Mode Select Inputs
The traction power amplifier is capable of four
modes of operation that are determined by two
mode select inputs
(MM1 and MM2) from the
steer/tractor manager. See Table 5
-
4 on
page 5
-
22.
Neutral Braking
The plugging force applied to the drive motor by
the power amplifier when the throttle is in
neutral
with
the deadman switches closed.
Open Circuit
Definitions
Overtemperature (Traction Power
Amplifier)
Overtemperature of the traction power amplifier
is
85" C (185" F) and above. Overheating is
unusual, but can occur if the traction power
amplifier is installed incorrectly or overloaded.
At overtemperature the drive current limit is
linearly decreased from full set current down to
zero. Plug current is not reduced by any
thermal conditions to allow full plugging
strength at all times.
Pulse Width Modulation
Pulse Width Modulation (PWM), also called
"
chopping,
"
controls the speed of the motor by
switching the battery voltage to the motor on
and off very quickly.
Short Circuit or
"
Short
"
A short circuit is an unspecified path in a
circuit that provides unwanted full or partial
continuity between two or more locations in an
electrical circuit.
Example: Two insulated wires are physically
next to each other and the insulation has been
worn off each of the wires. Because the
conductors inside each wire are now touching
each other, there is a short circuit.
Example: A power cable from the battery to
a
junction post in the truck has had the
insulation worn away. Because the wire
conductors are touching the tractor frame,
there is a short circuit of the battery cable.
Undertemperature
When the amplifier is operating at less than
-25" C (-13" F), the current limit is cut back
resulting in reduced travel speed and
acceleration.
A lack of a continuous path between two or
more electrical connections.
00700
-
CL222
-
05,
1
5 March 2005
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