Interface - prime mover smx45 Master Service Manual

F-code Section
PT S5.7
Transistor Controller
Version no T-code
001 SMX
240
Return
C-code
5460
in its optimal commutation range and arcing on the
commutator is minimized. As the throttle is increased and the
motor speeds up, the armature voltage will approach the
battery. Top speed is limited by confining the minimum
allowable field current.
Plug braking involves reversing the travel control to the
opposite direction causing the truck to decelerate smoothly.
The operator may choose to continue holding the travel
controls in the opposite direction. This will start the truck
moving in that direction or the operator may release the
handle and allow the truck to come to a complete halt. The
parking brake is automatically applied when released.
When using plug braking the operator may regulate, within
the programmed capabilities, the degree of the plugging
force and distance travelled during plugging. For the lightest
plugging force, and the longest distance, the travel control
should be operated in the opposite direction. For the
strongest plugging power, and the shortest distance, the
travel control should be operated to full speed in the opposite
direction. Plug braking may be regulated with the steering
control handle at any point between full speed.

1.2. Interface

The direction control section controls the drive motor direction
by manipulating the drive motor field polarity according to the
directional signal inputs from the Electronic Tiller Arm Card
(ETAC).
The thumb control section controls the drive motor speed and
torque by monitoring the position change of the arm angle A
and arm angle B switches. Variable motor speed is
accomplished by separate control of field and armature
currents.
The reverser circuitry in the ETAC provides the directional
travel control commands to the transistor controller.
The control circuit section controls all truck inputs and outputs
(excluding steering control handle head inputs.)
The ETAC controls. The transistor controller is the slave.
Master Service Manual 2006-12-12