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23.8 LIMIT SWITCHES
RK3:
LIMIT SWITCH ON THE BOOM SUPPORT
Prevents the operation of the outriggers and the driving device if the boom is
not resting on the support in the transport position. Controls the relay K30.
RK4:
SAFETY LIMIT SWITCH FOR THE ADJUSTED OPERATING RANGE
The operation of the limit switch stops the "boom down" movement and the
"telescope out" movement.
RK5:
BACKUP LIMIT SWITCH FOR THE SAFETY LIMIT SWITCH RK4.
Trips after the preset delay (2,4 seconds) the safety relay SR3 which controls
the sound signal AM2 and switches off the control voltage to the limit switch
RK4.
RK7:
SAFETY LIMIT SWITCH FOR THE TELESCOPE CHAIN.
Operation of the safety limit switch stops the electric motor. The limit switch
switches off the control voltage to the contactor K1 after which only the
emergency descent unit will operate.
RK8:
SAFETY LIMIT SWITCH “TELESCOPE FULLY RETRACTED”
The limits switch closes when the telescope is completely retracted.
If the RK4 or RK5 has failed, the boom cannot be lowered until the telescope
has been completely retracted and the points of the limit switch RK8 have
closed.
RK9:
INDUCTIVE LIMIT SWITCH
Limits turning of the platform to the left by disconnecting the control voltage
circuit for the relay K51.
RK10:
INDUCTIVE LIMIT SWITCH
Limits turning of the platform to the right by disconnecting the control voltage
circuit for the relay K52.
RK11-RK14:
LIMIT SWITCHES ON THE OUTRIGGERS
The limit switch closes as soon as sufficent force is exerted on the outrigger.
Prevents the operation of the boom unless the outriggers are not firmly
supported on the ground and all limit switches are not closed.
Courtesy of Crane.Market
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