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7.
ELECTRIC SYSTEM
7.1. ELECTRIC COMPONENTS
The appliance ID's used in the electric diagrams and the descriptions of the appliances'
operation are presented in this chapter. The product codes for ordering spare parts are
presented in the separate spare parts list.
MAIN ELECTRIC CABINET (PK), RELAYS
K1
Control contactor for the motor (M1)
K2
Auxiliary contactor for the emergency stop switch
Switches on/off the mains supply (230VAC).
K3
Sensor relay for AC feed. Enables operation of the electric motor, while the relay is
active.
K4
Switch-off relay for the combustion engine, connects the ignition spool of the
combustion engine to earth.
K5
Switch-off relay for the combustion engine, connects the ignition spool of the
combustion engine to earth.
K6
Relay for selecting motor, directs the “running command” to the desired motor.
K7
Switches the valve control over from turning of the boom to the selector valve for the
outriggers.
K8
Emergency descent relay, switches on the lowering of the articulated arms once the
limit switch RK8 closes (as the telescope is completely retracted).
K9
Operating relay for the motors, the relay is active while the motor is running (electric
motor or combustion engine).
K10
Emergency descent relay, switches over the control of the lifting/lowering movement
of the boom and the retraction/extension of the telescope to the disposal of the
emergency descent system.
K11
Emergency descent relay, switches over the control of the lifting/lowering movement
of the articulated arms and the turning of the boom to the disposal of the emergency
descent system.
K12
Emergency descent relay, switches over the control of the boom/chassis selector
valve to the disposal of the emergency descent system.
K13
Extinction relay for the timer card, while “control from the chassis panel” is selected.