6.Care and Maintenance
EM8 User's Manual
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Warning
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Only trained professionals are allowed to perform the maintenance and components replacement of the
inverter.
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Before opening the inverter, switch off all the electrical power supplies to the inverter, and wait LED
light off.
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Measure the voltage between P+ and P- with DC high voltage meter (Less than 25V).
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Avoid screws and other conductive materials fall into the inverter. Otherwise inverter may burn or heavy
damaged.
6.2.1 Inspection content
Tighten the screws of control circuit terminal.
1. Tighten the screws of the main circuit terminal. Check the overheating trace between the copper bars.
2. Check damage to the wires of the main circuit. Especially, If there is a cut trace of the skin contacting to
the outside of the metal.
3. Confirm the insulation of the main circuit wires.
4. Clean the dust of air duct, fan and circuit board. Usually clean this frequently if there is always dust
around surroundings.
6.3 Inspection and replacement of damageable parts
The inverter components may wear out and have performance degradations in long time running. To assure
it working stable and reliable, inverter requires preventive maintenance. When necessary, the parts must be
changed. Damageable parts of inverter include cooling fan and filtering capacitors. Their service life is
related to environment and maintenance.
6.3.1 Filtering capacitors
Pulse current in the main circuit affect the performance of aluminum electrolytic filtering capacitor. Extent
of the effect is related to ambient temperature and service conditions. In common cases, the electrolytic
capacitor has a life span of 40,000 to 50,000 operating hours. Change it according to working hours.
While electrolyte capacitor leaking, relief valve opening or capacitor expansion, change the capacitor
immediately.
6.3.2 Cooling fan
All the cooling fans in the inverter have a usage life about 30,000 to 40,000 hours(continuous use of two
years).Check the fan carefully, when there is a crack in the fan blade or abnormal noise. Replace the fan, if
there are any abnormalities.
6.4 Storage and warranty
6.4.1 Storage
If the inverter is not used temporarily or must be stored for a long time, pay attention to the following
points:
(1) Avoid storing it in an environment with high temperature, humid, vibration or metal dust. Keep good
ventilation.
(2) If the inverter is not used for a long time, it is needed to recovery the features of the filter capacitor that
turn on the inverter every 2 years. Meanwhile, check the functions of the inverter. Turn it on and increase
the voltage stability with an auto-transformer. And power supplying time must be more than 5 hours.
Caution
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If the inverter is not used for a long time, there is a drooping characteristic for the built-in filter capacitor.
6.4.2 Warranty
This inerter enjoy 12 months warranty (from the date of purchase). Our company provides free
maintenance or replacement, if there is a failure or damage in normal use cases within warranty period.
