Bendix Commercial Vehicle Systems EC-15 ANTILOCK CONTROLLER ASSY 4/08 - Manual (Page 3)

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FIGURE 3 - EC-15 ™ CONTROLLER AND CONNECTOR STYLES
PACKARD 30 PIN
CONNECTOR DEUTSCH 14 PIN
CONNECTORS
MOUNTING
The EC-15 ™ controller is available in two different mounting
styles. One model is designed to be mounted on an antilock
relay valve such as the AR-1
™ valve (see Service Data Sheet
SD-13-4795). The AR-1 ™ valve is a modified version of the
R-12 ™ relay valve. When the EC-15 ™ controller is mounted
on an antilock relay valve the resulting assembly receives a
different designation. For example when the EC-15
™ antilock
controller is mounted on the AR-1 ™ valve the resulting
assembly is known as a CR-15 ™ antilock controller relay.
The other EC-15 ™ controller model is intended for bracket
mounting to a frame member and is not attached to an
antilock relay valve.
CONTROLLER INPUTS/OUTPUTS
The EC-15 ™ 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-15
™ controller both receive and deliver
commands and information.
INPUTS
Wheel speed information is provided to the EC-15 ™ controller
via a wiring harness from individual wheel speed sensors
located at or in the vehicle wheels. Working in conjunction
with an exciter or tone ring, wheel speed sensors provide
information to the EC-15
™ controller in the form of an AC
signal which varies in voltage and frequency as the speed of
the wheel increases or decreases. The EC-15
™ 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-15
™ controller is able to
simultaneously receive, and individually interpret, speed
signals from four wheel speed sensors.
Vehicle power is supplied to the EC-15 ™ controller from the
ignition switch through a fuse or circuit breaker. The electrical
ground for the EC-15
™ controller is the vehicle chassis.
OUTPUTS
Modulators, like the Bendix ® M-21 ™ , are the means by which
the EC-15 ™ antilock controller is able to modify driver applied
air pressure to the service brakes. The modulator is an
electrically controlled air valve that is located near the service