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DC/AC Inverter
PWS series
User Manual
Page 18 (24)
4. Maintenance
In general, the module is maintenance-free.
A yearly inspection with following checks is recommended:
• Optical/mechanical inspection
• Fan function
• Removal of dust and dirt, especially on radiator surfaces
• Check for internal dust or humidity
Attention! Dust combined with moisture or water may influence or destroy the internal electronic
circuits.
Dust inside the unit can be blown out with dry compressed air.
The interval between the checks depends on ambient conditions of the installed module.
5. Trouble shooting
Symptom
Possible reason
•
No output voltage
•
•
•
•
•
•
•
•
•
Deviation of the
•
output voltage
If the unit still does not work even though all checks are done, please contact your sales agent or the
Eltek Valere Industrial service department.
ELTEK VALERE INDUSTRIAL ©2008
DC input voltage ok?
main switch (MCB) on?
green LED „OPERATION" on?
Incorrect polarity at the input?
DC input fuse (at DC busbar) ok?
signalling LED "Vin>" or "Vin<" on ?
short circuit or overload at the out-
put?
output fuse ok?
Unit switched off due to overheating
(LED "OVERLOAD/TEMP.>" on)?
overload at the output?
Is the voltage adjustment
(potentiometer) correct?
Corrective action
→ check
→ check
→ check
→ check
→ check
→ check
→ check/reduce load
→ check
→ search for the cause of the
overheating
→ check/reduce load
→ check/adjust
UM_PWS_E_R1.2
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