BENDIX EC-13 TRAILER ANTILOCK CONTROL Manuale - Pagina 2
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CONTROL (SERVICE) LINE
SUPPLY (EMERGENCY) LINE
TO TRAILER ELECTRICAL
CONNECTOR
TRAILER ANTILOCK
WIRING HARNESS
FIGURE 2 - TYPICAL EC-13
™
EC-13
CONTROLLER INFORMATION
INPUTS AND COMMAND OUTPUTS
GENERAL
™
The EC-13
controller receives information from several
components in the antilock system and, based on these
inputs, issues commands or delivers information. Some
portions of the EC-13
™
controller both receive and deliver
commands and information.
INPUTS
Wheel speed information is provided to the EC-13
controller via a wiring harness from individual speed sensors
located in the trailer wheels or axle housing. Working in
conjunction with an exciter or tone ring, the speed sensors
provide information to the EC-13
an AC signal which varies in voltage and frequency as the
speed of the wheel increases or decreases. The EC-13
controller is designed to receive wheel speed information,
from various wheel speed sensor models, at the rate of 100
pulses per wheel revolution. The EC-13
to simultaneously receive, and individually interpret, speed
signals from four wheel speed sensors (2 axles).
2
SPRING
BRAKE
SR-5
™
SPRING BRAKE VALVE
SPRING BRAKE
™
TRAILER ANTILOCK SYSTEM
™
controller in the form of
™
controller is able
WS-20
WHEEL SPEED SENSOR
M-12R
™
MODULATOR
WS-20
WHEEL SPEED
SENSOR
Vehicle power is supplied to the EC-13
from the stop light switch. The electrical ground for the
™
EC-13
controller is from the 7 pin trailer connector and
trailer chassis.
OUTPUTS
Modulators, like the Bendix
modulators, are the means by which the EC-13
controller is able to modify driver applied air pressure
to the service brakes. The EC-13
simultaneously and independently control two modulators
assemblies. The M-12
™
combination valves consisting of a standard relay valve
and solenoid assembly. They replace the standard relay
valves used to speed up the application and release of the
trailer's rear axle brakes. An external, three pin, wiring
harness connects the EC-13
M-12R
™
modulator solenoid assembly. For additional
™
information and service procedures see Bendix Service
Data Sheet SD-13-4772.
As stated previously, the EC-13
control two modulators. It can be mounted directly on an
M-12
™
modulator relay valve assembly and control a separate
™
M-12R
modulator or the EC-13
remote mounted to the trailer and control two M-12R
modulators. When mounted directly on a modulator, the
two separate components (EC-13
modulator) become a single assembly called the MC-13
modulator controller.
™
EC-13
™
CONTROLLER
30 PIN CONTROLLER
CONNECTOR
™
®
M-12
™
and M-12R
™
controller is able to
™
and M-12R
™
modulators are
™
controller to the M-12
™
controller is designed to
™
controller can itself be
™
controller and M-12
M-12R
™
MODULATOR
™
controller
™
™
antilock
™
or
™
™
™