Bendix Commercial Vehicle Systems EC-60 ATC STD/PREM CONTROLLERS - Manual (Page 3)

3
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 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.
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.
CHART 1 - EC-60 ™ CONTROLLERS AVAILABLE
ECU
Model
Mounting
Input
Voltage Sensors PMVs ATC
Blink
Codes
Serial Communication
PLC
ABS
Off-
Road
ATC
Off-
Road
Retarder
Relay
J1587 J1939
Standard
Cab
Frame
12 4 4
Standard
PLC
Cab
Frame
12 4 4
Premium
Cab
Frame
12 4/6 4/5/6
Premium Cab 24 4/6 4/5/6
HARDWARE CONFIGURATIONS
Standard Models
Standard 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 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 5.0 mVp-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.
Alternatively, the part number shown on the ECU label
can be identified as a PLC or non-PLC ECU by calling the
Bendix TechTeam at 1-800-AIR-BRAKE (1-800-247-2725).