Edwards XDD1 115 V AC, Instruction Manual

Page: 28 / 48

Page 20
A746‐03‐885A ‐ Maintenance
Maintenance
Ensure that maintenance is done only by suitably trained and supervised technicians. Ensure
that the maintenance technician is familiar with the safety procedures which relate to the
product processed by the vacuum system and that the equipment, if necessary, is
appropriately decontaminated before starting maintenance. Obey local and national safety
regulations.
In order to comply with law (occupational, health and safety regulations, safety at work law
and regulations for environmental protection) vacuum pumps, components and measuring
instruments returned to the manufacturer can be repaired only when certain procedures are
followed. Read form HS1 and fill out form HS2, which can be found at the back of printed
manuals or can be downloaded from http://edwardsvacuum.com/HSForms/.
Replacing diaphragms and valves
Note:
The images of the pumps may differ slightly, this does not influence replacing the diaphragm
and valves.
All bearings are encapsulated and are filled with long‐life lubricant, under normal operating
conditions these parts are maintenance free.
The valves and the diaphragms are wear parts. If the rated ultimate vacuum is no longer
achieved, the pump interior, the diaphragms and the valves must be cleaned and the
diaphragms and valves must be checked for cracks or other damage.
Depending on individual cases it may be efficient to check and clean the pump heads on a
regular basis. In case of normal wear the lifetime of the diaphragms and valves is > 10000
operating hours.
If the pump is exposed to corrosive gases or vapour or in case of deposits, maintenance should
be carried out frequently.
WARNING:
Before starting maintenance vent the system, isolate the pump and other components
from the vacuum system and the electrical supply, drain condensate and allow
sufficient cooling of the pump.
Before starting maintenance, wait two minutes after isolating the equipment from
mains to allow the capacitors to discharge.
WARNING:
Please read section Replacing diaphragms and valves completely before starting
maintenance.
CAUTION:
Prevent internal condensation, transfer of liquids or dust. The diaphragm and valves
will be damaged, if liquids are pumped in significant amount.