Eltek Valere Theia He-t User Manual page 71

8.2.9. Ventilation
The heat sink on the back of the inverter conducts heat away from the electronic components,
and must be clean to ensure sufficient cooling performance and thereby prevent yield losses.
This is accomplished by using either:
Figure 8.2.4: Heat sink
8.2.10. Varistors (VDR)
Varistors have a finite life expectancy, and therefore need regularly inspections (at least once
per year). When exposed to transients they degrade and lose their protective function and
need to be replaced. The replacement requires removal of the inverter lower cover and the use
of the VDR service tool, and must be performed by qualified personnel only!
DC Side
• A message is shown in the display when a DC varistor needs replacement (See
Events).
• Replace the damaged varistor with DC Varistor Kit ordered from your local Eltek Valere
representative, part number 271539.
Figure 8.2.5: Varistors on the DC side
User Manual THEIA HE-t String Inverters
• Vacuum cleaner
• Soft brush
• Compressed air
,
357115.013 Issue 1.0, 2011 April
7.2. Table of
The two varistors on the
DC side are located above
the network connection
on the left side of the
customer connection area.
Note the orientation of
the varistors if they need
to be replaced.
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