Bendix Commercial Vehicle Systems EC-60 ESP CONTROLLERS ADV - Manual (Page 5)

5
ADVANCED BENDIx EC-60 CONTROLLERS
USE POWER LINE CARRIER (PLC)
All new towing vehicles built since March 1, 2001 have had
an in-cab trailer ABS Indicator Lamp installed.
Trailers built since March 1, 2001 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 7 and 8. Typically the signal is
broadcast by the trailer ABS ECU.
FIGURE 7 - POWER LinE WiTHOUT PLC SignAL
FIGURE 8 - POWER LinE WiTH PLC SignAL
The application of PLC technology for the heavy vehicle
industry in North America is known as “PLC4Trucks.”
The Advanced Bendix EC-60 controller supports PLC
communications in accordance with SAE J2497.
PLC SIGNAL
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 Bendix 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.
BENDIx EC-60 CONTROLLER INPUTS
Battery and Ignition Inputs
The ECU operates at a nominal supply voltage of 12 or
24 volts, depending on 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 circuit
through a 5 amp fuse.
Ground Input
The Bendix EC-60 controller supports one ground input.
See page 48 for a system schematic.
ABS Indicator Lamp Ground Input
Advanced Bendix 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 Bendix 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 Bendix EC-60 controller receives the
AC signal, which varies in voltage and frequency as the
wheel speed changes.
Vehicle axle configurations 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 performance.
Diagnostic Blink Code Switch
A momentary switch that grounds the ABS Indicator Lamp
output is used to place the ECU into the diagnostic blink
code mode and is typically located on the vehicle’s dash
panel.