3
Alternatively, the part number shown on the ECU label can
be identified as a PLC or non-PLC model by calling the
Bendix TechTeam at 1-800-AIR-BRAKE (1-800-247-2725).
EC-60
™
CONTROLLER INPUTS
Battery and Ignition Inputs
The ECU operates at a nominal supply voltage of 12 or 24
volts, depending on the model of the ECU. The battery
input is connected through a 30 amp fuse directly to the
battery.
The ignition input is applied by the ignition switch through a
5 amp fuse.
Ground Input
The EC-60
™
controller supports one ground input. See pages
35 to 40 for system schematics.
ABS Indicator Lamp Ground Input (Cab ECUs
Only)
EC-60
™
cab ECUs require a second ground input (X1-12)
for the ABS indicator lamp. The X1 wire harness connector
contains an ABS indicator lamp interlock (X1-15), which
shorts the ABS indicator lamp circuit (X1-18) to ground if
the connector is removed from the ECU.
Bendix
®
WS-24
™
Wheel Speed Sensors
Wheel speed data is provided to the EC-60
™
controller from
the WS-24
™
wheel speed sensor (see Figure 2). Vehicles
have an exciter ring (or “tone ring”) as part of the wheel
assembly, and as the wheel turns, the teeth of the exciter
ring pass the wheel speed sensor, generating an AC signal.
The EC-60
™
controller receives the AC signal, which varies
in voltage and frequency as the wheel speed changes.
Vehicle axle configurations and ATC features determine the
number of WS-24
™
wheel speed sensors that must be used.
A vehicle with a single rear axle requires four wheel speed
sensors. Vehicles with two rear axles can utilize six wheel
speed sensors for optimal ABS and ATC performance.
CHART 1 - EC-60
™
CONTROLLERS AVAILABLE
ECU Mounting Input Sensors PMVs ATC Blink PLC ABS ATC Retarder
Model Voltage Codes J1587 J1939 Off-Road Off-Road Relay
Standard Cab 12 4 4
Frame
Standard Cab 12 4 4
PLC Frame
Premium Cab 12 4/6 4/5/6
Frame
Premium Cab 24 4/6 4/5/6
Serial Communication
HARDWARE CONFIGURATIONS
Standard Models
Standard model EC-60
™
controllers support four sensor/
four modulator (4S/4M) applications. Certain models
support Power Line Carrier (PLC) communications, with all
models supporting 12 volt installations. See Chart 1 for
more details.
Premium Models
Premium model EC-60
™
controllers support applications
up to six sensor/six modulator (6S/6M) installations with
ATC and drag torque control. All 12 volt models support
PLC. 24 volt models do not support PLC. See Chart 1 for
more details.
EC-60
™
CONTROLLERS WITH PLC
Since March 1, 2001, all towing vehicles must have an in-cab
trailer ABS Indicator Lamp. Trailers transmit the status of
the trailer ABS over the power line (the blue wire of the J560
connector) to the tractor using a Power Line Carrier (PLC)
signal. See Figures 4 and 5. Typically the signal is
broadcast by the trailer ABS ECU. The application of PLC
technology for the heavy vehicle industry is known as
“PLC4Trucks.” The Standard PLC EC-60
™
controller and
the Premium EC-60
™
controller (12 volt versions) support
PLC communications in accordance with SAE J2497.
Identifying an EC-60
™
Controller with PLC
Refer to the information panel on the ECU label to see if the
controller provides PLC.
An oscilloscope can be used to measure or identify the
presence of a PLC signal on the power line. The PLC signal
is an amplitude and frequency modulated signal. Depending
on the filtering and load on the power line, the PLC signal
amplitude can range from 5.0mVp-p to 7.0 Vp-p. Suggested
oscilloscope settings are AC coupling, 1 volt/div, 100 µsec/
div. The signal should be measured at the ignition power
input of the EC-60
™
controller.
Note: An ABS trailer equipped with PLC, or a PLC diagnostic
tool, must be connected to the vehicle in order to generate
a PLC signal on the power line.
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