5 Maintenance
© Precitec GmbH & Co. KG • EN 09/2019
5 - 41
5.2
Maintenance work
(summary)
Precitec KG
offers expert maintenance and repair services for its products.
Care/ cleaning
The following work must be carried out regularly and before working on the
laser head:
• Check the media and cable connections, the head fixing, cartridge and
nozzle
(nozzle electrode)
to ensure that they are connected firmly and do not
have any play.
• Remove any contamination.
Checking pressure tightness
The laser head must be checked for leaks regularly. If necessary, the gaskets
and seals
(wearing parts)
must be replaced.
Wearing parts
The parts below must be maintained and replaced if worn:
• Nozzle electrode and ceramic part
• Protective window
(protective window cartridge)
Electrical contacts
To ensure that the sensor system works reliably, the electrical contact surfaces
on the parts below must be clean:
• Nozzle electrode and ceramic part
• Sensor insert and BNC connection
Corrosion in the
water cooling circuit
To avoid any corrosion the instructions and maintenance intervals prescribed
by the machine manufacturer, laser source manufacturer or cooling unit
manufacturer must be observed.
To protect the water cooling circuit
(stainless steel)
against electro-chemical
corrosion, copper or brass connections must not be used. Only stainless steel
or plastic connections can be used.
To keep the laser head working reliably, Precitec recommends that the
cooling water is checked for microbiological contamination every 6 months
(microbiological contamination < 100 cfu/ml, e.g. VARIDOS bacterial test kit from Nalco,
www.nalco.com)
.
If, as a result of such tests, test parameter limits are exceeded, the cooling
water must be replaced and the cooling circuit cleaned or rinsed.
Attention – Unsuitable spare parts!
Unsuitable spare parts can damage or destroy components. Only use the
spare parts supplied by Precitec or original spare parts.
If tightness cannot be achieved by doing this, the laser head must be checked
by the manufacturer.
For pure stainless steel circuits
use only
water with a conductivity value
prescribed by the laser manufacturer
.
Warning!
Any protective or safety equipment removed must be fitted again prior to the
commissioning or setting up of the laser head - then checked to ensure it is
working properly.
