Electrical Equipment; General Information; Heating Plug Operation Principle - Belarus 1822.3 Operator's Manual

3.21 Electrical equipment

3.21.1 General information

The electric circuit diagram of tractors BELARUS-1822.3/1822 .3/2022.3/2022 .3
is shown in annex B.

3.21.2 Heating plug operation principle

As a means of start facilitation heating plugs are used in tractors "BELARUS –
1822.3/1822 .3/2022.3/2022 .3, they are mounted in the cylinder head. For individual
control of heating plug operation modes, indication of their operation a heating plug control
unit is used.
The heating plugs are activated automatically as the key of starter and instrument
switch is turned from position "0" (off) into position "I" (Instruments on) and the key stays
in this position for more than 2 sec. Hereby the heating plug pilot lamp 4 (figure 2.6.1)
lights up in the pilot lamp unit of the dashboard. The heating plug operation time (pre-start
heating time) makes about 20 sec. The engine is to be started after the lamp 4 transfers to
the standby mode. i.e. flashing with 1 Hz frequency.
If the engine is not started up within 30 sec. after the pilot lamps turn to flashing, the
heating plugs turn off and the pilot lamp goes out.
After the engine start-up, the heating plugs remain on for about 180 sec., hereby the
pilot lamp is off.
If the key of starter and instrument switch is turned from position "I" (Instruments
on) into position "II" (Engine start-up) within 2 sec., the heating plugs and the pilot lamp
will not turn on the engine will start up without being heated. The engine shall be starter
without advance heating when the temperature is positive or when the engine is warmed
up.
The heating plug operation algorithm has the following emergency modes:
- as the key of starter and instrument switch is turned from position "0" (Off) into
position "I" (Instruments on) and the heating plugs complete the entire operation cycle the
heating plug pilot lamp starts to flash continuously with 2 Hz frequency. This means that
there is a failure in the heating plug operation – closed circuit (fritting) of heating plugs re-
lay. Should this failure be left unrepaired the storage battery may get discharged and bro-
ken.
- flashing of the pilot lamp during the entire operation cycle in the mode of one acti-
vation with a duration of 0.5 sec. in 3 sec. period informs of non-closure of the relay con-
tacts (break of control wires, break of power supply wire, failure of the heating plugs relay,
etc.). Should this failure be left unrepaired, the engine could be difficult or impossible to
start.
IT IS FORBIDDEN TO OPERATE THE TRACTOR UNTIL FAILURES OF THE
HEATING PLUG SYSTEM ARE FOUND OUT AND ELIMINATED, AS IT MAY LEAD TO
DISCHARGE OF ACCUMULATOR BATTERIES!
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