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LME / RSD10 / RSD20 / RSD50 / RSD100 (Contrac) ELECTRICAL LINEAR ACTUATOR | OI/LME/RSD10/100-EN REV. E
7 Commissioning
Note
It is imperative that you observe the operating instruction of the
corresponding electronic unit for the commissioning of the
actuator.
8 Operation
Safety instructions
DANGER
Danger to life due to unexpected movement of the actuator!
Unexpected movement of the actuator may lead to very
serious injuries or to death.
•
Make sure that the actuator can move without posing a
danger to people!
WARNING
Danger of crushing between external limit stop and valve
yoke / actuator housing!
•
Do not reach into the danger zone.
Note
Positioning loop monitoring in the electronic unit must always
be active, it is set as default at the factory and cannot be
deactivated nor changed afterwards.
•
Before power-up, make sure that the ambient conditions
specified in the data sheet are complied with and that the
power supply corresponds with the information specified on
the name plate of the electronic unit.
•
If it can be assumed that safe operation is no longer
possible, take the unit out of operation and secure against
unintended startup.
•
When the actuator is installed in work or traffic areas that
may be accessed by unauthorized persons, the operator
must put appropriate protective measures in place.
•
Switch off the power supply to the motor before handwheel
operation.
Automatic operation
WARNING
Risk of injury due to live parts!
Risk of death or serious injuries due to electricity and
unexpected machine movements. In automatic mode the
motor is always under power, even at standstill.
•
When working on the actuator or the related subassembly,
switch off the supply voltage for the electronic unit and
separate anti-condensation heater (option), and take
precautions to prevent unintentional switch-on.
The motor triggered by the electronic unit controls the axially
fixed drive sleeve /nut assembly via oil-lubricated spur gears. A
ball bearing screw that is radially fixed by an anti-twist arrester
converts the rotary motion into a linear one (Figure 22). The
screw is the upper part of the thrust rod and has an adjustable
mechanical limit stop (RSD, only).
A position sensor detects the current thrust rod position via
mechanical reduction gearing without backlash.
The brake integrated in the motor carries out the stop function
if the supply voltage is switched off.
Figure 22: Ball bearing screw with nut, cross-section
29
M10308
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