Chapter 2 Product Information
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replacement according to the operating time.
1. Cooling fan
Possible reason for damage: Bearing is
worn and blade deteriorates.
Judging criteria: Whether there is crack
on the blade and whether there is abnormal
vibration noise upon startup.
2. Filter electrolytic capacitor
Possible reason for damage: Input power
supply in poor quality, high ambient
temperature, frequent load jumping, and
electrolyte aging.
Judging criteria: Whether there is liquid
leakage and whether the safe valve has
projected, and measure the static capacitance,
and the insulating resistance.
2.7.4 Storage of Inverter
Upon acquiring the inverter, the user shall
pay attention to the following points regarding
the temporary and long-term storage of the
inverter:
1) Pack the inverter with original package
and place back into the packing box of our
company.
2) Long-term storage will degrade the
electrolytic capacitor. Thus, the product shall
be powered up once every 2 years, each time
lasting at least five hours. The input voltage
shall be increased slowly to the rated value
with the regulator.
2.8 Instructions on Warranty of
Inverter
Free warranty only applies to the inverter
itself.
1. Our company will provide 18-month
warranty (starting from the leave-factory date
as indicated on the barcode) for the failure or
damage under normal use conditions. If the
equipment has been used for over 18 months,
reasonable repair expenses will be charged.
2. Reasonable repair expenses will be
charged for the following situations within 18
months:
1) The equipment is damaged because
the user fails to comply with the requirements
of the user’s manual;
2) Damage caused by fire, flood and
abnormal voltage;
3) Damage caused when the inverter is
used for abnormal function.
The service expenses will be calculated
according to the standard of the manufacturer.
If there is any agreement, the agreement shall
prevail.
2.9 Prototyping Guide
MD 300 series inverter provides two
operation modes: Common V/F and
open-loop vector.
When selecting inverter, it must firstly
make clear the technical requirements of the
system for variable frequency speed
adjustment and specific details regarding the
applications and load characteristics of the
inverter, and select the model and determine
the operating mode through taking into overall
consideration the adaptable motor, output
voltage, rated output current and other
factors.
The basic principle is that the rated load
current of the motor shall not exceed the rated
current of the inverter. Generally, the
selection is based on the adaptable motor
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