PS
S8.0
8200
001
OE35
Version no
T-code
F-code
Section
C-code
Micro 70 Wire Guidance
306
Service Manual
1997-10-24
controller at a 1X gain for better wire acquisition. After the
system has acquired the wire this signal is amplified to a 10X
gain for better guidance while on wire.
The FSA Mobicon Steering Servo Amplifier and the steer
motor are the output components of the Micro 70 guidance
system. The Micro 70 controller generates an output signal or
steering correction. This signal is received by the FSA
Mobicon Steering Servo Amplifier and the amplified signal
from the FSA is sent to the steer motor to turn the mechanical
components of the truck steering mechanism. The FSA is
fuse protected. Three control relays are used. CR1 is used to
disconnect the steer motor whenever the truck is not moving.
CR2 is used to engage the parking brake through a solenoid
if a steering malfunction occurs; i.e. loss of wire. CR3 is used
to enable a truck speed limit when the system is in acquisition
mode to reduce the possibility of guide wire overshoot.
The control panel on the operator console consists of a
pushbutton auto/manual switch, an indicator light for 'on wire/
loss of wire' condition while in the auto mode, and an audible
alarm if a 'loss of wire' condition occurs. The truck parking
brake automatically applies if a 'loss of wire' condition occurs.
The Micro 70 controller 'fails safe' if switch failure occurs and
the parking brake applies.
The Micro 70 controller can be easily changed without
opening the control box to accept guide wire frequencies of
2.2 KHz, 5.2 KHz, 6.25 KHz, or 7 KHz. These are all the
common frequencies used by other guidance
system
manufacturers.
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