Bendix Commercial Vehicle Systems MC-30 TRAILER ABS CONTROLLER - Manual (Page 2)

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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 ™ tractor ABS controller, and
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 ™ modulator used a
4-pin internal connector.
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
™ modulator-
valve supply port. A tank with a reinforced port must be used.
See Figure 1 for tank-mount MC-30
™ modulator-valve.
CAUTION: The tank-mounted MC-30 ™ modulator-valve
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
™ controller. The bracket studs
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
™ controller
models with PLC will support communication in accordance
with SAE J2497.
Identifying MC-30 ™ Controller units with PLC
Most MC-30 ™ controller units will contain PLC capability.
However, some MC-30 ™ controller units installed prior to
March 1, 2001 may not. An MC-30 ™ controller with PLC
can be identifi ed by the individual part number label and pin
stamp on the EC-30T
™ controller housing. On PLC units,
the PLC function can be disabled with a diagnostic tool.
FIGURE 2 - MC-30 ™ CONTROLLER BRACKET (FRAME)
MOUNT ASSEMBLY
Physical MC-30 ™ MC-12 ™
Feature Controller Modulator
ECU Enclosure Plastic ECU Metal ECU
ECU Mounting Bracket Mounted to Directly Mounted to ABS
ABS Modulator Valve Modulator Valve Body
ECU Electrical 30-pin 14-pin
Connector
ABS Modulator
3-pin External 4-pin Internal
Connector 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 ™ controller
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 ™ ABS controller.
The EC-30T ™ controller can also be frame rail mounted,
independent of the M-30T ™ modulator-valve.