Bendix Commercial Vehicle Systems EC-30 ABS/ATC CONTROLLER 2/08 - Manual (Page 6)

6
CHART 4 - LED POWER-UP DISPLAY OF EC-30 ™
CONTROLLER CONFIGURATION
LED Power-Up Sequence LEDs
1 st When power is applied All LEDs Illuminate
Then the LEDs indicate one of the following:
2 nd 4 Sensors SEN-RER-FRT
6 Sensors SEN-RER-MID-FRT
Then the LEDs indicate one of the following:
ATC Engine Limiting TRC
3 rd ATC Differential Braking TRC-MOD
No ATC N/A
The LEDs will then indicate system status:
4 th Normal Operation (if no faults) VLT
POWER-UP SEQUENCE
ABS Warning Lamp at Power-Up
At power-up without detected faults, the ABS warning lamp
turns on for 2.5 seconds and then turns off. See fi gure 7.
ATC Active / Warning Lamp at Power-Up
At power-up, the ATC active/warning lamp displays the
ATC control confi guration and then turns off. A series of
blinks indicates if the ATC is confi gured for engine torque
limiting and differential braking, engine torque limiting only,
or differential braking only. See fi gure 7.
Driver
Left Front
Right Rear
Left Rear
Right Mid
Left Mid
FIGURE 8 - VEHICLE ORIENTATION
FIGURE 7 - EC-30 ™ CONTROLLER POWER-UP LAMP
SEQUENCE
Diagnostic LEDs at Power-Up
At power-up, the diagnostic LEDs all turn on, then display
the confi guration for sensors and the ATC. After showing
the confi guration, only the green VLT LED will stay on.
However, if a fault is detected, the faulted component will
be identifi ed by the red LEDs. See chart 4.
Trailer ABS WL
(PLC Detected)
Trailer ABS WL
(PLC Not Detected)
ON
OFF
Powered Vehicle ABS WL ON
OFF
ON Engine torque
limiting and
differential braking
ON
OFF
Engine torque
limiting only
ON
OFF
Differential braking only
ON
OFF
No ATC
OFF
ON
OFF
Trailer ABS Warning Lamp
At power-up, the trailer ABS warning lamp turns on for 2.5
seconds and then turns off. This only occurs if a PLC trailer
or PLC diagnostic tool is connected to the tractor at the
time ignition power is applied. Only an EC-30
™ controller
with PLC installed on a towing vehicle will support the
trailer ABS lamp.
Retarder Disable Relay at Power-Up
At power-up, the EC-30 ™ controller may toggle the retarder
disable relay. If the relay is located in the cab it is usually
audible to the operator.
Modulator Chuff Test at Power-Up
At power-up, the EC-30 ™ controller activates a patented
modulator chuff test. The modulator chuff test is an
electrical and pneumatic ABS modulator test, that can
assist the technician in verifying proper modulator wiring
and installation. With brake pressure applied, a properly
installed modulator causes a single sharp audible chuff
of air pressure by activating the hold solenoid two times
and the exhaust solenoid once. If the modulator is wired
incorrectly, the modulator will produce a double chuff, or
no chuff at all. The EC-30
™ controller activates a chuff at
each modulator in the following sequence:
Right-Front, Left-Front, Right-Rear, Left-Rear. See fi gure 8.
The chuff sequence is then repeated for a total of 8 chuffs. If
an issue is detected during the modulator chuff test, look for
faults and compare the modulator wiring and plumbing to the
EC-30
™ controller system schematic shown in fi gure 13.
Right Front