BELARUS-920.4/952.4 Operating manual
14
The indicator works upon signals from pulse sensors of final drive tooth gear speed of left
and right rear tractor wheels. Speed is indicated upon a signal from the sensor, installed on final
drive gear of the wheel, rotating at lower speed.
If one of speed sensors is defective, integrated display shows speed readouts with speed-
ometer upon the signal from nondefective sensor. On LCD display of ID specific malfunction of
circuits or speed sensors, if signals from them are missing, is represented in the form of digit “0”,
which defines malfunction location, to the left and to the right (see below).
b) 2 (Fig. 1.5) – tachometer, displays engine crankshaft speed on needle indicator.
Information on engine speed on tractors BELARUS-952.4/920.4 comes from electronic con-
trol module. Speed readouts range is from 0 to 3500 (rpm).
c) 3 (Fig. 1.5) – PTO tachometer displays PTO speed on indicator lamp.
PTO tachometer operates upon the frequency signal, resulting from recalculation of engine
speed by means of entered value of index “KV2” (see below), other than “0”, meanwhile value of
index “ZV”, equal to “0”, should be entered (see below).
When ID is switched on (see below the description of device functional check) and engine
is running (message “engine speed” from ECM is transmitted) identifications of scales “540” and
“1000” are illuminated simultaneously.
Indication of PTO scale segment (with regard to the entered value of index “KV2”) occurs
when PTO rated speed, equal to 750 rpm, is achieved.
For reference:
indication of lower PTO scale segment (with regard to index “KV2”) occurs when engine
speed of 1400-1500 rpm and above is achieved.
According to selected PTO speed mode (540 or 1000) illuminated scale segments identify
value of PTO speed in accordance with given table 3.
Table 3
“540” “1000” Segment location on
scale
650 1150 3.1
580 1050 3.2
500 950 3.3
420 850 3.4
320 750 3.5
“PTO speed” mode of liquid-crystal display 11 of multifunctional display (Fig. 1.5) (see
below the description of multifunctional display operation) is not active in this case.
d) 11 (Fig. 1.5) - multifunctional display (MD) is a liquid-crystal display, displays infor-
mation in two fields at the same time (see fig. 1.6):
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