MTW BELARUS 952.5, Руководство оператора

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952.5-0000010 OM
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The other fuses for EECS are mounted in the protection and switching unit. switch-
ing and protection unit.
The protection and switching unit (PASU) of 1000 SCR series is intended to distrib-
ute power supply to tractor electronic control systems and to protect their electrical circuits
against short circuit and current overload.
The PASU is installed in the rear part of the cab, at a special compartment behind
the driver seat, as shown in figure 2.21.5.
1 – electronic foot pedal to control fuel feed; 2 – console of engine control system; 3
– electronic handle to control fuel feed; 4 – protection and switching unit; 5 – screw; 6 –
engine electronic control unit; 7 –connection bundles.
Figure 2.21.5 – Arrangement of EECS components in the cab
To access the PASU it is required to do four bolts out and open the cover of the
special compartment. Then to access the relay and fuses of the PASU do four screws 5
out (Figure 2.21.5) and take the iron cover off.
The block includes ten fuses 1(Figure 2.21.6) (F1…F10), seven electromagnetic re-
lays 4 (K1…K7), commutating power supply for consumers. Each fuse has got warning
LEDs of red color mounted on the front panel nearby which are intended to warn that the
corresponding fuse blew out. Besides there are warning LEDs of yellow color 2 and 3. The
LED 2 indicates continuous power supply to PASU, regardless of the position of the bat-
tery switch. The LED 3 indicates presence of continuous power, supplied to PASU only
with the battery switch turned on.
The arrangement diagram of fuses, relays and other components of PASU is given
in figure 2.21.6.