BELARUS-1221.2/1221
В
.2/1221.3 Operating controls and instruments
25
The electric tachospeedometer installed in the dashboard operates as follows:
•
on setting the starter and instrument switch in position “I” when the tractor is stopped,
the display (7) shows the engine running hours (5);
•
when the tractor is moving, the display (7) shows the tractor speed indication (6)
(km/h), while the indication (5) disappears. The electric signal of the speed comes from
the speed sensors mounted on the rear axle cover (BV1, BV2). The speed readings are
taken through a signal from the sensor mounted on the pinion of the final drive of the
wheel rotating at lesser speed. The calculated speed is higher than the actual one, be-
cause no tractor skid is the taken into account;
•
on starting the engine, the pointer indicator (8) moves round the index dial (1) to dis-
play the rotational speed of the engine crankshaft. At the same time, the display (4)
shows the PTO speed indication (rpm). The scale (3) is assigned to the PTO I and the
scale (2) – to the PTO II. The electric signal of the rotational speed is taken from the
phase winding of the alternator.
1.2. Tachospeedometer control board (Fig. 2)
The control board is installed in the instruments dashboard and serves for programming
the tachospeedometer to the specific model of the Belarus tractor.
Fig. 2.
Control board (А3):
1. Button for setting the tachospeedometer to the programming mode and selecting the
programming parameter on the tachospeedometer display (7).2. Button for selecting the
value of the coded parameter shown on the display (7)
1.3
Programming the ta
chospeedometer АР70.3813
ATTENTION!
The tachospeedometer has been programmed just to your tractor model
at the factory. Re-programming is required only in case of tyre type changing
.
Do not re-
program the tachospeedometer, if not necessary.
The tachospeedometer shall be programmed to ensure the correct display of the follow-
ing tractor’s parameters: engine rotational speed, tractor motion speed and PTO rota-
tional speed (540 and 1000).
Programming procedure:
– remove the control unit cover;
– press the button (1) to enter the programming mode (Fig. 2).
1. To ensure the correct display of the tractor motion speed, it is necessary to program
the tachospeedometer to the number of teeth of the pinion at the place of installation of
Содержание 1221.2
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Страница 290: ...BELARUS 1221 2 1221В 2 1221 3 Supplement 293 Electrical scheme of tractor connections ...
Страница 291: ...BELARUS 1221 2 1221В 2 1221 3 Supplement 294 Variants of tractor connections ...
Страница 293: ...BELARUS 1221 2 1221В 2 1221 3 Supplement 290 826 3805010 instrument board scheme ...