Digital air- conditioner controller KR- 454
This error and fault diagnosis program runs, as it were, "in the
background" during normal air-conditioner operation and
monitors the sensors, setpoint potentiometers and valve
potentiometers and the switched outputs of the valve motors and
other loads for discontinuity and short circuit. If one or more
faults or errors occur when on the move, the time display is
cleared and the relevant malfunction is
displayed in the form of
a consecutive number. An "E" for ERROR in front of the number
signals the error.
S14
The LED in key
S14
blinks simultaneously.
You must then "acknowledge" the fault with this key. The air-
conditioner centre then continues to operate in Emergency mode,
and the sensor values are simulated for instance, dependent
on the operating state. This Emergency mode can be seen from a
dot at the far right on the display. The time is displayed once
again after you acknowledge the error.
If there is a valve potentiometer error, the air-conditioner
controller attempts to operate the valves even without a check-
back signal so as
to permit it to regulate the system, even if
not precisely.
If an output has a short circuit, this output is disconnected and
the relevant error is shown on the display. The system attempts
to reactivate the output each time you switch the ignition off and
on.
4.1 ERROR MEMORY FUNCTION
If an error occurs when on the move and if this error is
acknowledged, the error number is stored in the so called unit's
error memory.
INDUSTRIE-ELEKTRONIK
Control and regulating systems for vehicle air conditioning
D-71691 Freiberg a.N.,
Siemensstr.21
Phone: +49 7141 / 68877 - 0
Fax: +49 7141 / 68877 - 39
page: 14
of:
42
04541530.SDW
Issue: October 1998 - Copyright (C) BADER GmbH - Alterations reserve
