BENDIX MC-11 TRACTOR ANTILOCK Посібник - Сторінка 3
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INLET SOLENOID
RESERVOIR
FIGURE 3 - APPLYING: NORMAL SERVICE APPLICATION
The wiring connections on the 14 pin connector are as
follows:
PIN A - Power
PIN B - Retarder Disable
PIN C - Ground
PIN D - Dash Light
PIN E - Serial Link
PIN A - Vehicle power is supplied to the EC-11
from the ignition switch, through a fuse, to pin A on
the 14 pin connector.
PIN B - The EC-11
controller is equipped with a retarder
™
disable circuit, which, when coupled with an
electrical relay, will disable the vehicle retarder
(engine or transmission) during an antilock stop.
The retarder disable function is not essential but is
highly recommended for vehicles equipped with a
retarder.Connection to pin B on the EC-11
controller provides this function.
PIN C - Pin C connects directly to negative vehicle ground.
PIN D - A dash light and its electrical relay are controlled
by the EC-11
controller through pin D. The light
™
advises the driver of the antilock system condition.
EXHAUST
SOLENOID
SUPPLY
PIN IF - Serial Link
PIN L - Sensor
PIN M - Sensor
PIN N - Sensor
PIN P - Sensor
controller
™
BRAKE
VALVE
CONTROL
PISTON
DELIVERY
EXHAUST
PIN E - The serial link allows the EC-11
its operating PIN IF condition to a specialized
external computer in response to certain commands
it receives. The serial link configuration conforms to
S.A.E. standard J1708. Pins E and F provide serial
link connections to the EC-11
function is not essential for MC-11
assembly operation.
PIN L - Sensors mounted at the wheel end send wheel
speed information PIN M to the EC-11
through pins L-M and N-P. The EC-11
receives the information at (PIN N) 100 pulses per
wheel revolution.
The MC-11
happening at the wheel ends because of the signals it
receives from the wheel speed sensors. The sensors are
actually A.C. generators. They create a magnetic field; and
when the field is interrupted by an irregular surface, like a
tone ring, A.C. voltage is produced. The frequency of voltage
increases or decreases as wheel speed increases or
decreases.
™
During normal, non-antilock operation, the M-12
inlet solenoid is open, and the exhaust solenoid is closed.
In this condition, the M-12
relay valve. It receives a control signal from the foot valve,
DOUBLE
CHECK VALVE
BRAKE
CHAMBER
™
tractor antilock assembly "knows" what's
modulator is a regular R-12
™
TRAILER
CONTROL
VALVE
controller to "report"
™
™
controller, but the
tractor antilock
™
controller
™
controller
™
modulator
™
™
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