13
5. Supervision of the telescope chain
The extension chains for the telescope are doubled.
If the load-bearing chain slackens or breaks, the
doubling chain prevents the movements of the
telescope, and the safety switch RK7/RK15 breaks
the emergency stop circuit.
RK15
RK7
~3 mm
~32 mm
~ 40
mm
A
A
A - A
A
B
A
B
C
C
LIMIT SWITCH RK7/RK15
EXTENSION CHAIN
DOUBLING CHAIN
RETRACTION CHAIN
6. Preventing the inclination of the platform
The platform is levelled hydraulically by means of a so-called slave cylinder system, where
the master cylinder controls the slave cylinder that inclines the work platform.
The platform keeps its level position only if the
valves in the system are tight.
The levelling system comprises the following
parts:
• Master cylinder
• Slave cylinder
• Load regulation valve
• Double load regulation valve