Haldex EB Plus, Operator'S Manual

Page: 7 / 28

7
A warning device located on
the driver's console of the towing
vehicle is operated from the
ISO 7638 power cable only when
the EB
+
is powered by the ignition
switch. Fig 8.
Warning Device
The warning device function
depends on the ISO 7638
power supply used:
Note: If a dedicated power source
is unavailable to the EB
+ from the
ISO 7638 connector then system
integrity will not be indicated by
the cab mounted warning device.
As an option to the cab warning
device a trailer mounted warning
lamp may be provided as an
auxiliary function. This lamp
mimics the signal to the cab
warning device but will only
function if the ISO7638 power
is connected.
Note: The signal produced may
be different to that produced by
the cab device due to possible
modification of the cab device
by the towing vehicle.
System Check Procedure
1. On power up of the system, the warning
device must indicate in the following
sequence in order to show a fault-free
system:
OPTION 'A' - Industry normal
2. During the self-check
procedure, the system cycles
the EPRV's. With foot brake
applied one exhaust of air
from each EPRV will be
audible.
Once these two checks are
made with correct results, no
further checks are required.
If the results are not satisfactory,
Haldex DIAG
+
or EB
+
Info Centre
should be used to establish the
diagnosis.
This information is described
visually in Fig 9 on page 8.
Fig 8
Warning
device
Warning Device, System Check Procedure and Power Up Modes
ON for 2 seconds = Warning device
OK and
system self-
checking.
OFF for 2 seconds = System
self-checked
and preparing
to check
sensors.
ON until moving = System
waiting for
vehicle to
move above
10 km/h in
order to check
that the
sensors are
working.
OFF = Once the
vehicle is
moving above
10 km/h and
the warning
device clears,
the electronic
system is fully
checked.
Power Up Modes
The EB + system has two power
up modes. With switching the
Ignition on (B+ applied) the
following occurs:
With No yellow line pneumatic
pressure (i.e. Brakes OFF)
The system adopts load sensing
mode when the brakes are
applied. This load sensing mode
is limited to 2 minutes for any
single brake application, after
which it returns to a
push-through condition
(approx 1:1).
The push-through condition is
cancelled on vehicle movement
above 10 km/h returning the
system to load sensing
operation.
With yellow line pneumatic
pressure (i.e. Brakes ON)
(Park on air)
Apply foot brake, switch
Ignition On.
The system adopts a
push-through (approx 1:1)
condition. When the brakes are
released and re-applied the
system remains in push-through
unless the brakes are released
for longer than 2 minutes, after
which it returns to load sensing
operation.
This condition is cancelled on
vehicle movement above
10 km/h returning the system
to load sensing operation.
ON
OFF
2 sec. 2 sec.
@
10 km/h
OPTION 'B' - Haldex normal
ON for 2 seconds = Warning device
OK and
system self-
checking.
OFF = System
self-checked
(not sensors)
ON
OFF
2 sec.