BENDIX SD-13-4785 User Manual
3
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
relay valve such as the AR-1
™
valve (see Service Data
Sheet SD-13-4795). The AR-1
™
valve is a modifi ed 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
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.
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
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
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
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
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.
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
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
is an electrically controlled air valve that is located near