Safety Requirements Application Notes
Ventilation openings shall be cleaned regularly. Front panel, signal lamps and safeguarding equip-
ment shall be tested at least once a month.
Phantom Shells shall be exposed to liquids only as long as required for the operation. Ope ration
and cleaning process es shall not damage the coating in order to keep the sealing function of the
surfaces. Check the sealing function of drainage taps every time when filling the phantom shell.
Note: Do not use aggressive s olvents or abrasive substances for cleaning. Do not use
sharp-edged tools to stir liquids
12.10 Disposal
Safety installations must only be removed if the system will be taken out of operation permanently.
This has to be done by removing the mains supply from the system. The state of the disposed
system must be such that it cannot be put into operation without using tools.
If the system needs to be disposed of, it can easily be disassembled and recycled using state of
the art recycling technology and following current disposal regulation. Special considerations are
required for the robot arm (gear oil included), batteries and simulating liquids as mentioned above.
Other system parts (i.e., PCBs, cables) may be disposed of as standard electronic material.
12.11 Uninterruptible Power Supply
Uninterruptible Power Supplies (UPS) are widely used to protect sensitive e quipment against
interruptions of the power net. In addition, UPS ensure that the power supply for the protected
equipment is stable by monitoring and filtering the mains.
The functional principle is that the UPS is connected between the mains and the protected equip-
ment. During normal operation the input AC voltage is rectified and the resulting DC voltage is
used to charge the internal batteries of the UPS. Furthermore, the DC voltage is converted to a
proper AC output voltage using an inverter to supply the load. In case of an interruption of the
power net or in case of instable voltage from the mains the internal batteries take over to supply
the load via the inverter. The autonomy time, what means the time the protected equipment can
be operated powered by the batteries inside the UPS, is depending on the size of the battery as
well as on the power consumption of the connected equipment. Short interruptions can be handled
by the UPS. For longer interruption of the p ower net, the UPS provides enough time to prop e rly
switch off the connected equipment and thus to avoid damage and the loss of data.
With DASY5 there are two major concerns regarding an interruption of the power supply: the robot
and the controlling PC. Regarding the PC a loss of measurement results might occur which would
result in a repetition of the me asureme nt running before. Related to the robot, an interruption of
the power supply could cause an uncontrolled movement of the robot arm. The consequence is a
potential risk or damage for the DASY5 equipment and personnel.
In case of an interruption to the three-phase power supply the power to the amplifiers and with
this to the motors is removed immediately. But for the brakes it takes some hundred milliseconds
to close. With this it can happen that the robot arm falls down up to several centimeters without
control what could cause damages to the probe or to the DAE. Furthermore the s can which was in
progress is interrupted and in case that also the power supply of the controlling PC was affected
by the interruption it is likely that the collected data is lost. With this the scan would have to
be repeated. Also in case the power supply is not interrupted but the power net is not stable,
Schmid & Partner Engineering AG, DASY5 Manual, February 2007 12-7
(2 pages)
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