1. Power supply system
The MTZ tractors are equipped with the
following power supply systems:
• On-board power system with the rated
voltage of 12 V and starting system with
the voltage of 12 V and two storage
batteries connected in parallel each with
the voltage of 12 V (Fig. 2, variants 1, 3
and Fig. 3);
• On-board power system with the rated
voltage of 12 V and starting system with
the voltage of 24 V and two storage
batteries each with the voltage of 12 V
interconnected in parallel by means of
the circuit breaker (Fig. 2, variant 2 and
Fig. 4).
Fig. 2 shows the schematic of the power
supply system with four versions of
connection of the storage battery and
ground switches (circuit breakers):
• Basic version – starting system 24
V. The storage batteries GB1 and GB2
are interconnected in series through a
remotely controlled SB circuit breaker
QS1.
• Variant 1 – starting system 12 V.
The storage batteries GB1 and GB2 are
interconnected in parallel and connected
to the circuitry through a remotely
controlled SB circuit breaker QS2.
• Variant 2 – starting system 24 V.
The storage batteries GB1 and GB2 are
interconnected in series through the
manually controlled battery disconnect
switch QS4.
• Variant 3 – starting system 12 V.
АКБ GB1 and GB2 are interconnected
in parallel and connected to the circuitry
through the manually controlled battery
disconnect switch QS3.
The voltage indicator used on the
tractors has a zonal scale making it
possible to get the information on the
condition of the power supply system of
the tractor:
1. After setting the battery disconnect
switch to the on position before starting
the engine (when the consumers are not
energized), the voltage indicator pointer
is in the yellow zone (12-13.2 V) and
indicated the electromotive force of the
storage battery and degree of its charge:
12.7 V: 100% of charge;
12 V: 50% of the charge and less.
2. On starting the engine, the voltage
indicator pointer moves to the left red
zone (10-12 V). During the operation of
the starter, the voltage drop down to 6 V
is possible.
3. After starting the engine, the indicator
pointer indicated the voltage in the on-
board power system generated by the
alternator.
In the normal operation mode, the
pointer shall be in the green zone (13.2-
15.2 V). The short-time pointer
movement to the yellow zone (12-13.2
V) is allowed during the engine running
at low rotational speed and connection
of the consumers, the total power of
which exceeds the alternator output
power at this speed mode.
In the remaining operating modes, if the
voltmeter pointer is
• to the left from the green zone, the
alternator or integral voltage adjuster
(IVA) are faulty or open circuit;
• to the right from the green zone, the
IVA is faulty.
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