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7.2. ELECTRIC DIAGRAM
RK16
Inductive sensor.
Retards the lifting and lowering movements of the boom and the turning movement,
if the length of the boom is about 16m.
RK17
Inductive sensor.
Retards the lifting and lowering movements of the boom and the turning movement,
if the length of the boom is about 20m.
RK18
Limit switch for boom angle.
Retards the lifting movement of the boom while approaching the maximum length of
the lifting cylinder.
Turning device (RU), other items
B1
Battery 12VDC 44Ah.
Iida
Switch-off unit for the combustion engine; connects the ignition spool to earth.
LS
Inclination sensor: monitors the level position of the lift. If the sensor is operating
normally, a green signal light will be flashing on it; if the inclination exceeds ±10º, a
red signal light will light up.
K4
Blocking relay for dual starting of the combustion engine; the relay disconnects
current supply to the start solenoid.
K42h
Start relay for the combustion engine.
M1
Electric motor 230VAC 16A.
M2
Emergency descent motor 12 VDC, Maximum uninterrupted operating time is 10
minutes.
P1, P2
Centre-position sensors for the spool of the boom/chassis selector valve. Prevent
operation of the reset circuit for the safety relay SR3 in case the spool is not in the
centre.
S37
Pushbutton, which enables string start of the power unit. To be used, if the battery is
flat.
SPV
Main switch, disconnects the positive pole of the battery from the system.
SR1
Solenoid for the emergency descent unit.
T2
Battery re-charger, charges the battery if the mains supply is connected.
ÄM1
Sound signal.