plate covering these areas. This support plate must not be removed
under any circumstances.
Guide tube unit
The guide tube unit is made up of the outer tube (
a3
), middle tube
(
a4
) and inner tube (
a5
), and its purpose is to carry centric and
eccentric loads.
Drive unit
The permanent magnet motor is a 24–30 V DC gear motor and
drives the ballscrews via a spur gear. The speed of the movement
depends on the load and the direction of the movement. The motor
and spur gear are attached to the middle tube (
a4
).
Spur gear
The spur gear drives the ballscrews. It is driven via the permanent
magnet motor.
End positions
The stroke is limited by the integrated end limit switches that cut the
power to the DC gear motor. If the CPMT moves beyond the end
limit switches (in the event of a malfunction), a mechanical safety
end stop (
a9
) halts the movement.
Thermo-switch
The thermo-switch in the motor, controls thermal and electrical
overload and switches off the permanent magnet motor if it over-
heats. The pillar cannot be operated again until the drive tempera-
ture has fallen below the switching threshold.
Brake
The brake is attached to the gear motor. Its purpose is to block the
movement of the pillar during standstill or if the power supply to the
motor is cut.
External control unit
The DC gear motor is fed via an external control unit through the
cable connection (
a2
). The control unit controls the running direction
of the telescopic pillar. An integrated 2-hall encoder on the motor
can be accessed by the controller to enable variable speed control or
positioning.
!
Note!
Additional variations between CPMT pillars are given in
the appendix.
21
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