Hatz 2-4L30 Workshop Manual page 150

Key to circuit diagrams (DIN 40719)
Key Designation of electrical component
R 1 Pre-heat plug
Heating flange
R 2
R 3 Line resistor for pre-heat system
Resistor
R 4
R 5 Line resistor with thermo-time switch
S 1 Pre-heat start switch (5-position)
Master switch
S 2
S 3 Pre-heat/start switch (3-position)
Start-stop-switch
S 4
S 5 Switch for speed control
S 6 Engine temperature switch
Oil pressure switch
S 7
S 8 Pressure switch for air-filter
Fan monitoring switch
S 9
S 10 Pre-heat temperature switch
Remote-start switch
S 11
S 12 Remote stop switch
T 1 Transducer for speed measurement
Decoupling diode
V 1
V 2 Freewheeling diode
V 3 Zener diode
Suppressor diode
V 4
W 1 Earth (ground), negative return line
W 2 Screened line at generator
Terminal strip at instrument box
X 1
X 2 Flat-pin junction box
Plug at emergency stop switch
X 3
X 4 Socket at emergency stop switch
X 5 Terminal block in control box / terminal box
Solenoid for speed control
Y 1
Y 2 Solenoid for engine shutdown
Servo (valve) solenoid for engine shutdown
Y 3
Y 4 Fuel shut-off valve
Y 5 High-presure shut-down valve
Suppressor choke
Z 1
Z 2 Suppressor capacitor
4
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