Diagnostics Of Electronic Systems Of Rpto, Fpto, Fdad, Radl Control, Gear Shifting Control For Failures; Description Of Cecs Performance Testing - Belarus 3522.5 Operator's Manual

2.13.5.8 Diagnostics of electronic systems of RPTO, FPTO, FDAD, RADL control,
gear shifting control for failures.
In CECS the annunciators 6, 21, 24, 29, 34 (figure 2.13.4), except for indication of
engaged state of a respective drive or a gear, perform diagnostics of the following failures
of the electronic system of the drive or gear control:
- short circuit in electromagnetic line of the distributor is indicated by a single flash-
ing of a corresponding annunciator of drive or gear engaged condition;
- breaking of circuit to the distributor electromagnet is indicated by a two-time flash-
ing of a corresponding annunciator of drive or gear engaged condition;
- malfunction of the pressure sensor is indicated by a three-time flashing of a corre-
sponding annunciator of drive or gear engaged condition;
- sticking of the distributor valve is indicated by a four-time flashing of a correspond-
ing annunciator of drive or gear engaged condition;
Besides in case of sticking of the gearbox distributor valve, an annunciator of gear-
box emergency operation mode 8 is additionally activated.
Note – The annunciator of gearbox emergency operation mode 8 is also activated
with actuation of the switch "Failure" 3 (figure 4.5.1).
Annunciation of failures in drives operation and in gear shifting operation is followed by a con-
tinuous signal of the acoustic annunciator. It is possible to switch off the acoustic annunciator
temporary, for this it is necessary to press the button 18 shortly (figure 2.13.4), herewith the
annunciator of buzzer deactivation, located to the left of the button 18 turns on and off. It
shall be taken into account that in future when the CECS is activated and the respective
pressure sensors go off, the acoustic annunciator will stay on until the corresponding fault
is eliminated.
When several failures are detected simultaneously the corresponding annunciators
indicate failure codes in the following order:
а) short circuit to electromagnet of proportional valve;
b) breaking of circuit to electromagnet of proportional valve;
c) malfunction of pressure sensors;
d) sticking of electrohydraulic valve.
Temporary pause between failure codes is three times more than the pause be-
tween flashings of the annunciator within the code.
Detected failures shall be eliminated in accordance with instructions of the subsec-
tion 7.1 "Possible failures of the electronic system for gearbox control, RADL control,
FDAD control, FPTO and RPTO control and instructions on their elimination".

2.13.5.9 Description of CECS performance testing

In CECS testing of indicator and annunciator performance is carried out by each
power connection. Herewith, all LED- annunciators and indicators turn on for two seconds,
the digital indicator 7 (figure 2.13.4) displays figure "8"; the acoustic annunciator goes off.
Then the LED-indicators and annunciators, the digital indicator and the acoustic signal
switch to the operating mode – the annunciators 28, 31, 33 remain on, the indicator of gear
shifting mode displays a middle mode of operation, and the digital indicator displays "0"
figure, the other LED-annunciators and the acoustic annunciator go out.
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