CONTROLS AND INSTRUMENTS 4-13
PA1628 H3-41, H3-45 Operator’s Manual
and the vehicle ahead until the audible warning
stops or maneuver clear of the forward vehicle.
WARNING
Following Distance Alert is always active
whenever the coach is moving to a speed
greater than 37 mph (60 km/h), whether or
not ACB is turned on. Active interventions
of ACB to maintain safe following distance
(throttle reduction, engine brake/retarder
application, service brakes application) are
only operational when the ACB is engaged
with a cruise speed set.
IMPACT ALERT
The Impact Alert warning is the most severe
warning issued by the
ACB system. This alert
indicates that the driver must take immediate
evasive action by applying more braking power
and/or steering clear of the vehicle ahead to
avoid a potential collision.
The Impact Alert is also applicable to stationary
metallic objects such as stopped or stalled
vehicles. This alert provides a warning given up
to 3.0 seconds before a potential collision with a
stationary metallic object in the coach’s lane of
travel. The driver can either slow down or
maneuver in an attempt to avoid the object. The
Impact Alert will only warn and will not actively
decelerate or brake the coach when approaching
stationary objects.
WARNING
Impact Alerts are always operational when
the vehicle is running, whether or not ACB
is turned on. Active interventions of ACB to
maintain safe following distance (throttle
reduction, engine brake/retarder
application, service brakes application) are
only operational when the ACB is engaged
with a cruise speed set.
BRAKE OVERUSE WARNING
ACB provides a warning when the system is
intervening and using the service brakes
excessively. Overuse of the foundation brakes
can lead to the brakes overheating and a
potential loss of braking performance from
brake fade. For example, the use of ACB on
downhill runs may cause this alert to be
activated. It is recommended that ACB be
disengaged on downhill grades. The driver
should use appropriate gearing and brake
techniques, and not rely on ACB, on downhill
grades.
If the driver does not respond to the Brake
Overuse Warning after a brief delay, the ACB will
switch off.
Summary of Contents for H 2018 Series
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