COMPILER TECO/ATL
REG. CODE
1-5302-351
MODEL N°
50563
DATE OF ISSUE
04.90
REVISION 04
ENDORSED
DATE
15.11.99
83
ELECTRICAL SYSTEM
VII
GLOW PLUG
One(1) glow plug is required per engine cylinder. Proper glow plug
operation is required for good start ability at any ambient
temperature. All FOCS diesel engines should be preheated before
attempting to start the engine. Further, Lombardini recommends that
all applications be fitted with an automatic glow plug controller
system such as is detailed below. The use of a glow plug control
circuit will insure the proper amount of preheat at all temperatures.
Glow Plug Specifications: Nominal Voltage- 12.5V
Current Absorption-12/14A at 5 seconds
Sheath Temperature-850°C at 5 seconds
COMPONENTS:
1 Sheath
2 Primary Heating Coil
3 Secondary Heating Coil
NOTE: GLOW PLUG TORQUE- 20Nm
GLOW PLUG CONTROLLER / RELAY WITH COOLANT TEMP.
SENSOR
As discussed above, a glow plug control circuit is available. The glow
plug controller acts as both a load relay and timer. The timer function
is a function of coolant temperature as measured by a temperature
sensor (thermistor) as shown below. An electrical schematic of the
glow plug control circuit is shown on page 65.
TEMPERATURE SENSOR (THERMISTOR)
The thermistor is located on the thermostat housing, adjacent to the
high coolant temperature switch. The thermistor must be installed in
the thermostat housing in the port located nearest to the cylinder
head. (see the figure to the left)
THERMISTOR SPECIFICATIONS:
Temperature Range:30-50°C
Voltage Range: 6-24V
Maximum Temperature: 150°C
Installation Torque: 30 Nm
OIL PRESSURE (LOW) SWITCH, COOLANT TEMPERATURE
(HIGH) SWITCH
Oil Pressure (low) Switch Specifications:
General: Single Pole, N.C.
Opening Pressure: 0.15 / 0.45 bar
Installation Torque: 25 Nm
Coolant Temperature (High) Switch Specifications:
General: Single Pole, N.O.
Closing Temp.: 107 / 113°C
Max. Power Absorption: 3 W
Voltage Range: 6 / 24V
Installation Torque: 25 Nm
THERMISTOR INPUT GLOW PLUG HEAT TIME (sec)
Resistance (ohms) Coolant Temp. (°C) Pre-heat Post-heat
7000 -20 26.5±3 5 (+2, -1)
2400 0 15.0±1.5 5 (+2, -1)
1000 +20 9.5±15 (+2, -1)
460 +40 7.0±15 (+2, -1)
#320 +50 0 0
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