Components; Controller Comparison To Mc-12 Modulator; Controller Assemblies; Controller With Plc - BENDIX MC-30 TRAILER ABS CONTROLLER Manual

™
MC-30 CONTROLLER COMPONENTS
™
The MC-30 controller ABS installation consists of the
following components:
™
- EC-30T ABS Electronic Control Unit (ECU) (1)
™
- M-30T ABS modulator-valve with relay function (1 or 2)
™
- WS-20 wheel speed sensors (2 or 4)
- Sensors spring clips (2 or 4)
- Trailer mounted ABS indicator lamp
- Pigtail wiring harness
- PLC signal for dash mounted trailer ABS indicator lamp
(Towed vehicles manufactured after March 1, 2001)
™
MC-30 CONTROLLER COMPARISON TO
™
MC-12 MODULATOR
™
The MC-30 controller has been designed to replace the
™
MC-12 modulator as the standard Bendix trailer ABS
controller assembly for OEM and aftermarket installations.
™
The EC-30T controller has a black plastic enclosure
®
similar to the Bendix EC-30
is mounted to the modulator-valve with a bracket. The
™
MC-12 modulator utilized a metal ECU enclosure and
was directly bolted to the modulator body. The MC-30
controller has a 30-pin electrical connector and the MC-12
modulator has a 14-pin connector.
The M-30T ™ ABS modulator-valve utilizes a 3-pin external
electrical connector, where the MC-12
4-pin internal connector.
Physical MC-30
Feature Controller
ECU Enclosure Plastic ECU
ECU Mounting Bracket Mounted to
ABS Modulator Valve
ECU Electrical 30-pin
Connector
ABS Modulator 3-pin External
Connector Connector
CHART 1 - MC-30 ™ CONTROLLER AND MC-12
MODULATOR DIFFERENCES
EC-30T ™ TRAILER ABS ECU
™
The EC-30T is a plastic electronic controller with a
single 30-pin electrical connector. The EC-30T
enclosure is fi lled with a hard epoxy-based potting that
seals all internal components from the environment. A
patented LED (light emitting diode) diagnostic display
and magnetic reset switch are incorporated in the housing
for simple, self-contained diagnostics. The design of the
™
EC-30T controller's electronics is robust against radio,
electromagnetic and environmental interference.
™
The EC-30T controller is typically mounted to the
M-30T ™ modulator-valve using four bolts and a bracket.
This assembly forms an MC-30
The EC-30T ™ controller can also be frame rail mounted,
independent of the M-30T
2
™
tractor ABS controller, and
™
modulator used a
™ ™
MC-12
Modulator
Metal ECU
Directly Mounted to ABS
Modulator Valve Body
14-pin
4-pin Internal
Connector
™
™
controller
™ ABS controller.
™
modulator-valve.
™
FIGURE 2 - MC-30
MOUNT ASSEMBLY
™
MC-30

CONTROLLER ASSEMBLIES

Tank (Nipple) Mounted
™
The MC-30 controller tank-mount assembly is mounted by
™
using a schedule 80 (heavy gauge steel) 1/2" nipple directly
™
between the trailer supply tank and the MC-30
valve supply port. A tank with a reinforced port must be used.
See Figure 1 for tank-mount MC-30
CAUTION: The tank-mounted MC-30
cannot be mounted on a frame or crossmember using the
ECU bracket holes.
Bracket (Chassis) Mounted
™
The MC-30 controller bracket mount assembly is mounted
directly to the trailer frame rail or crossmember. See Figure
2 for bracket mount MC-30
are secured using three 5/16-18 nuts and lock washers
torqued to 180-220 in-lbs.
MC-30 ™

CONTROLLER WITH PLC

Effective March 1, 2001 all towed vehicles must transmit a
signal to control an in-cab trailer ABS indicator lamp. Trailers
built after this date will transmit the status of the trailer ABS unit
over the ignition power wire (blue wire of the J560 connector)
using Power Line Carrier (PLC) communications.
The PLC signal is usually broadcast by the trailer ABS ECU.
The application of PLC technology for the heavy vehicle
industry is known as PLC4Trucks. MC-30
models with PLC will support communication in accordance
with SAE J2497.
Identifying MC-30
Most MC-30 ™ controller units will contain PLC capability.
However, some MC-30
March 1, 2001 may not. An MC-30
can be identifi ed by the individual part number label and pin
stamp on the EC-30T
the PLC function can be disabled with a diagnostic tool.
CONTROLLER BRACKET (FRAME)
™
modulator-valve.
™
modulator-valve
™
controller. The bracket studs
™
Controller units with PLC
™ controller units installed prior to
™
controller with PLC
™ controller housing. On PLC units,
™ modulator-
™
controller