PS
S5.0
5000
001
OE35
Version noT-code
F-code
Section
C-code
Electrical System with TX and TT Card
136
Service Manual
1997-10-23
Dash Line Shows Average Motor Current
During the off time, the energy stored in the motor, by virtue
of the motors inductance, will cause current to circulate
through the motor around the loop formed by 3REC. Thus,
providing what is called “flyback current”. The illustrate above
shows the nature of the motor current which is composed of
both battery current and the inductive flyback current. It
should be noted that the average motor current measured will
be greater than the average battery current. The SCR control,
in effect, converts battery current at battery volts into a higher
motor current and a lower motor volts.
The time for the next ON and OFF cycle to start is determined
by the time that the control card takes to oscillate. This
frequency of oscillation is controlled by the potentiometer in
the accelerator and automatic circuitry in the card. Slow
speed is obtained by having maximum ohms in the
potentiometer. As the resistance in the potentiometer
decreases, the speed of the motor increases. The SCR circuit
is capable of delivering approximately 95% speed. For full
speed operation, the 1A contactor is closed to apply full
battery voltage across the motor.
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