MTZ 952.2 - Page 55

Controls and Instrumentation
MTZ series 900
24
Indicator of the fuel level in the tank (4)
with orange control lamp of reserve level. It op-
erates with the fuel level sensor (BN1).
The instrument has the points: 0-1/4-1/2-3/4-
1.
Do not allow consuming the fuel to empty
tank (instrument pointer is at orange zone).
Voltage indicator (5) with the red control
lamp red of additional SB charging.
It displays the SB voltage, when the engine
is running and the starter switch key is in the
“I” position. When the engine is running, it
indicates the voltage at the generator termi-
nals.
The reading values are given in Table 14 be-
low.
Table 14
Scale zone, col-
our
Power supply system state
when the engine
is running
when the engine
is not running
13.0 – 15.0 V
green
Normal charg-
ing mode
10.0 – 12.0 V
red
Generator is
not working
SB is run down
12.0 – 13.0 V
yellow
No charging of
SB (low charg-
ing voltage)
SB has
normal
charging
15.0 – 16.0 V
red
SB overcharg-
ing
SB has normal
charging
White hairline in
yellow zone
The rated emf
of the SB is12.7
V
1.15. Connection the combination meter
To integrate the combination meter to the in-
strumentation system, the rear panel is pro-
vided with two blocks Х1 and Х2 (Fig. 8).
The purpose of the contacts of the blocks of
the combination meter is shown in Tables
15, 16.
Fig. 8. Blocks for connecting the combination meter (rear
view):
Х1 – 9-contact block;
Х2 – 7-contact block.
Block Х 1
Table 15
Contact
Address
1
To the instrument backlight switch
2
To the “–” terminal of the battery
3
Monitoring the storage battery charging
4
Buzzer
5
To the sensor of the oil pressure in the en-
gine (ВР1)
6
To the sensor of the emergency tempera-
ture of the engine cooling fluid (SК1)
7
To the sensor of the emergency oil pressure
in the engine (SP2)
8
To the sensor of the cooling fluid tempera-
ture (BK1)
9
To the “+” SB terminal (12 V)
Block Х2
Table 16
Contact
Address
1
Reserved
2
Reserved
3
To the fuel level sensor (BN1)
4
To the gearbox oil pressure sensor (not
used)
5
To the sensor of emergency drop of the
air pressure (SP4)
6
To the sensor of the reserve fuel level
(BN1)
7
To the sensor of the air pressure (ВР2)