Functioning Algorithm Of Pilot Lamp To Indicate Operation Of Heating Plugs - Belarus 2022.6 Operator's Manual

2.7.2 Functioning algorithm of pilot lamp to indicate operation of heating plugs

As a means of start facilitation, heating plugs (HP) are used in tractors "BELARUS –
2022.6" which are mounted in the cylinder unit head. For individual control of heating plug
operation modes and indication of their operation, a heating plug control unit is used.
Heating plugs are not activated, if the engine temperature exceeds +5°C. In this
case heating plug pilot lamp 4 (figure 2.7.1) lights up for 2 sec. or does not light up at all.
If the engine temperature is below +5°C, the heating plugs are activated automati-
cally as the key of starter and instrument switch is turned from position "0" (off) into posi-
tion "I" (Instruments on). In this case heating plug pilot lamp 4 lights up in the pilot lamp
unit of the dashboard. The heating plug operation time depends on the engine temperature
according to table 2.7.1. It is necessary to start the engine as lamp 4 goes out after the
time specified in table 2.7.1 After the engine start-up, the heating plugs remain activated
for some time, then they go out. The heating plug operation time after the engine start-up
depends on the engine temperature at the moment of the heating plug activation. (see ta-
ble 2.7.1).
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 po-
sition "I" (Instruments on) 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 – all heating
plugs are closed-circuit or their connection is disturbed (disconnected from the heating
plug control unit), the heating plug control unit is not powered or the power supply wire is
damaged. In case of short circuit, the heating plug control unit cuts power supply to the
heating plugs.
- after the engine start-up the heating plug pilot lamp 4 starts flashing for one minute
with 3 sec. of cycle duration and 0,25 sec. of flash duration. The number of flashes can be
different. The start-up procedure runs in an ordinary way. This means that one or more
(but not all) heating plugs are faulty. The number of flashes within one cycle equals to the
number of faulty heating plugs;
If the specified failure is not eliminated, it may be difficult to start the engine at low
temperature.
- during the pre-start heating before the engine start-up, pilot lamp 4 flashes with 1
Hz frequency. This points at short-circuit of the heating plug temperature sensor, or break-
age in the heating plug temperature sensor circuit, or sensor failure. In this case the time
of engine pre-start heating as well as plug heating after engine start-up is specified in table
2.7.1.
TRACTOR OPERATION IS FORBIDDEN UNTIL FAILURES OF THE HEATING
PLUG SYSTEM ARE DETECTED AND ELIMINATED. OTHERWISE IT MAY LEAD TO
DISCHARGE OF ACCUMULATOR BATTERIES!
Table 2.7.1. – Heating plug operation time depending on engine temperature
Engine temperature, °С Time of engine pre-start
above 5
from + 5 to 0
from 0 to -10
from -10 to -15
from -15 to -20
from -20 to -25
under -25
short-circuit failure or
sensor breakout,
sensor malfunction
heating, sec., at least
0
15
20
25
35
42
50
50
30
2022.6-0000010 OM
Time of heating after engine
start-up, sec., at least
0
25
50
75
100
125
150
150