Fda Drive Control - Belarus 3522.5 Operator's Manual

3.13.2 FDA drive control

The FDA drive is controlled by electrohydraulic system. The electronic part of FDA drive
control system is a part of complex control system and consists of electronic unit CECS 1
(figure 3.13.1), located in cabin on the panel to the right of the driver; of wheel turning an-
gle sensor 12 mounted on the right side on FDA; of two sensors 15 and 16 of working
brakes engaged condition, mounted in cabin over brakes pedals; of FDA control distributor
28 (figure 3.11.2) with electromagnet and sensor of FDA drive engaged condition, of con-
necting harnesses 14 (figure 3.13.1) with plug-and-jack connection 7.
The system is powered from onboard power system through security and switching unit
2, according wiring scheme of complex control system for DL, FDA and PTO and gear chang-
ing (Appendix B). System supply voltage is delivered after turn of starter and instruments switch
in position «Instruments ON».
On face plate of CECS unit 1 there are buttons 28 and 29 of on/off switching of auto-
matic and positive operation mode, respectively, near to them are situated annunciators 22
for indication of set mode and between them is located annunciator 23 of FDA drive en-
gaged condition (oil supply under pressure in FDA drive clutch).
FDA drive is off in starting position. The pressure is not supplied to electromagnet of
FDA control distributor 28 (figure 3.11.2), FDA drive clutch is connected with drain and
drive is switched off.
When pressed on button 28 (figure 3.13.1) "AUTO" at steering wheel position corre-
sponding to linear movement, distributor 28 (figure 3.11.2) is activated, in FDA drive clutch
is supplied oil under pressure and drive is switched off.
FDA drive is switched off automatically at steering wheel turning by angle above
25 ° (at sensor 12 activation (figure 3.13.1)) or at driving speed above16 km/h). When driv-
ing speed is under 13 km/h FDA drive should switch on automatically.
Automatic mode for FDA drive on/off switching is switched off at second pressing on
button 28 "AUTO" or at pressing and release of button 29 of positive mode for FDA drive
engagement.
If it is necessary to engage positive FDA drive for short time, independent of any
conditions, press and keep button 29. FDA drive remains engaged for the period of button
29 keeping in pressed position. When button 29 is up, FDA drive returns to starting (disen-
gaged) condition.
It is enough to press and keep button 29 for change of FDA drive engagement
automatic mode for positive mode.
As indicator for switching on of system operation mode serve annunciators 22 situ-
ated close to corresponding on/off mode switching buttons 28 and 29. Engaged condition
of FDA drive (pumping of oil under pressure in FDA drive clutch) is indicated by annuncia-
tor 23 located between button switches 28 and 29 of automatic and positive modes. An-
nunciator 23 is switched on according to signal from pressure sensor 18 that is actuated
(contacts closing) at pressure from above 0,6 ... 0,8 MPa.
When it is necessary to install wheel turning angle 12 (after dismantle or at re-
placement) keep an eye on installation truth:
- ensure backlash of 3±0,2 mm between end face of wheel turning angle 12 and
support, mounted on right FDA reduction unit;
- at steering wheel position corresponding to linear movement, the axle of wheel
turning angle sensor 12 should match with centre (axle) of support on FDA reduction unit
(it should be provided symmetry of sensor activation at steering wheel turning in both di-
rections by angle ±25º).
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