User’s Guide for EM760 series high-performance vector inverter Chapter 7 Maintenance Daily Maintenance of Inverter Due to the operating environment, aging of internal components and other factors, the inverter may have various faults. Thus, the inverter must be regularly maintained during storage and use. ⚫ Before use, check if the inverter has intact external conditions and screws are tight after transportation. ⚫ During the normal operation of the inverter, clean dust on a regular basis and check whether the screws are tightened.
⚫ If the inverter is not in use for a long time, it is recommended to power it on (preferably 30 min) once every six months during storage, to prevent the failure of electronic components. ⚫ The inverter should not be used in a place that exposes it to dampness, vibration, oily dirt and conductive dust. When the inverter needs to operate in such a place, it must be set in an electrical cabinet or cabin with protective measures. Please check the following items during the normal operation of the inverter: ⚫ Check the motor for abnormal noise, vibration and abnormal heating. ⚫ Check whether the ambient temperature is too high. ⚫ Check whether the output current is normal.
⚫ Check whether the cooling fan of the inverter works properly. Depending on the usage, the user needs to check the inverter on a regular basis to eliminate faults and safety hazards. For inspection, it is required to turn off the power supply; do not perform the inspection until the lapse of 10 minutes after the keyboard LED goes off. The check content is shown in Table 7-1. Table 7-1 Content of regular inspection In order to make the inverter work properly in a long time, regular maintenance and replacement must be performed regularly based on the service life of its internal components.
The service life of the components of the inverter varies depending on the operating environment and conditions. Table 7-2 Replacement Intervals of Inverter Components The operating conditions for replacement of the inverter components listed in the above table are as follows: Ambient temperature: 40°C Load factor: Less than 80%. Operating time: less than 12 hours per day. Instructions for Inverter Warranty Our company will provide warranty services for the inverter in the following cases. The warranty applies to the inverter body only. The warranty covers failure and damage of the inverter within twelve months' operation.
Any fault or damage beyond the warranty period may be eliminated by the company at a proper cost. Failure or damage the inverter is not covered by the warranty during the one-year warranty period in any of the following cases: ⚫ The inverter is damaged due to noncompliance with the instructions in this manual during operation; ⚫ The inverter is damaged due to flood, fire, abnormal voltage, etc.; 46 Check Item Check Content Solution Main circuit terminal Check whether the screws are loose. Tighten the screws with a screwdriver. Heat sink and vent Check them for dust, foreign matters and clogging. Purge them with dry compressed air (pressure: 4-6 kg/cm2).
PCB (printed circuit board) Cooling fan Check it for abnormal noise and vibration. Check whether the cumulative running time is up to 20,000 hours. Replace the cooling fan Electrolytic capacitor Check it for color changes, odor and bubbles. Replace the electrolytic capacitor. Name of Part Standard Replacement Interval (Year) Cooling fan 2-3 years Electrolytic capacitor 4-5 years