Belarus 1523, Operating Manual

Page: 34 / 312

BELARUS- 1523/1523В /1523.3 /1523В.3 Drive Controls and Instrumentation
33
Principle of operation and purpose of the combined indicator
a) 1 – the speed gauge displays the calculated speed of the tractor on the pointer
indicator. The calculated speed exceeds the real one because no tractor skidding is
taken into account.
The indicator operated from the signals from the pulse transducers of the rota-
tional speed of the gears of the final drives of the rear left and right wheels of the tractor.
The speed readings are generated on the basis of the signal from the sensor fitted on
the pinion of the final drive of the wheel rotating at lower speed.
In case of fault of one of the speed sensors, the combined indicator displays the
speed readings of the speed gauge on the basis of the signal from the serviceable sen-
sor. The typical fault of the circuits or speed sensors in case of absence of signals from
them is presented on the LCD display of the combined indicator as “0” (zero) character-
izing the location of the fault, either on the left or on the right (see below).
b) 2 – the engine rotational speed gauge displays the engine crankshaft rota-
tional speed on the pointer indicator.
c) 3 – the PTO rotational speed displays the rotational speed on the PTO shaft
on the light indicator.
The PTO rotational speed gauge operates on the basis of the signal from the
pulse transducer of the rotational speed mounted above the toothed washer on the PTO
tail-piece shaft.
In the programming mode, it is necessary to enter the coefficient ZV value differ-
ent from 0 (see below), namely, equal to the number of teeth of the PTO tail piece. In
this case, the coefficient KV2 (see below) can have arbitrary value, because it is not
used in the calculations of the PTO rotational speed.
Depending on the PTO rotational speed, the combined indicator selects auto-
matically the range (from 320-750 or from 750-1250) that is accompanied visually by
switching on the backlight of the digital designation of the scale: “540” (4.1) or “1000”
(4.2); with this, the threshold values of operation of the scale segments change in ac-
cordance with the table data;
The five LED segments of the PTO scale (3.1 … 3.5) are switched on starting
from the bottom one including the segment with the current value of the PTO rotational
speed covered by the range of its glowing.
“540” “1000” Segment location
on the scale
650 1150 3.1
580 1050 3.2
500 950 3.3
420 850 3.4
320 750
1)
3.5
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1
)
rotational speed, at which the scale designation “1000” is switched on