Ewellix THG - Safety Devices; Safeguard Against Restart; Modifications of Device

8
THG/TLG/TLT
2.5 Safety device
WARNING
Emergency stop switch
The pillars THG, TLG, TLT have not any on/off- switch.
In case of failures, risks the pillar must be disconnected from the
control unit, respectively the control unit from main supply.
That for an emergency stop switch must be provided in the
application.
Integration with an emergency-stop required (for cer-
tain applications)
The pillar is intended for use within a complete system (lift-
ing column plus control). It does not have its own operating
control elements and does not have an independent emer-
gency-stop function.
Install emergency stop functions for the pillar and integrate
them into the safety chain of the complete system prior to
operating the pillar.
The emergency stop function has to be connected in such a
way that a disruption of the power supply or the activation of
the power supply after a power disruption cannot cause a
hazardous situation for persons and objects.
Theemergencyshut-osystemsmustalwaysbefreely
accessible.
Furthermore, within the complete system, install a function
to set free a patient, if the system has just blocked.
NOTE
The manufacturer of the equipment specifies the applica- tions in
which the emergency stop systems must be installed.
The following safety devices are already installed:
THG/TLG/TLT
The brake takes care of self-preservation in idle mode. The
maximum self-preservation force of the brake in idle mode is
the compressive or tensile force of the telescopic pillar (refer
to technical data sheets in the appendix).
The THG 11, TLG 11 and TLT 11 telescopic pillars have an in-
tegratedover-currentsafetyshut-o.
In its standard version, the device does not feature an over-cur-
rentsafetyshut-oandmustbeshutoviaanEwellixcontrol
unit.
A screw nut converts the rotation of the gear unit into a lin-
ear motion. If the ball screw nut breaks, its function is taken
over by the integrated back-up nut and the telescopic pillar
can engage in a one-time movement against the load
direction.
DANGER
In case of use a third-party control unit see chapter 6.5
Connection to the control unit.
The following safety devices are incorporated into the
separate control unit:
The standard version of the pillar does not feature any ther-
mal fuse protection and can overheat and be damaged. In
case of overheating, an Ewellix control unit with an inte-
gratedthermalswitchwillturnthedeviceo.
NOTICE
Authorized only accessories (operating elements) with buttons
(monostable).
NOTICE
Damage from overheating
Overheating of the telescopic pillar can cause damage.
Using a control unit that is not recommended by Ewellix can result
in overheating of the telescopic pillar.
2.6 Safeguard against
restart
To secure the telescopic pillar against unintentional restart:
1. Pull the power line plug of the control (connected to the
telescopic pillar) out of the power outlet.
WARNING
Life-threatening situation through unauthorized restart!
For work in hazard zones, there is a risk that the power supply
will be turned on without prior authorization. This presents a life-
threatening situation for people in the hazard zone.
Therefore:
• Follow the information concerning safeguarding against restarting
of the power supply in the chapters of this operating manual.
• Always follow the process to safeguard against a restart as de-
scribed below.
2.7 Modications of
device
WARNING
To prevent hazardous situations and to ensure optimal output,
changes, additions and retooling of the pillar must not be
carried out unless explicitly authorized by Ewellix.