Product Information MD280/MD280N User Manual
1. Our company will provide 18-month warranty (starting from the
leave-factory date as indicated on the barcode) for the fault 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 Guide to Model Selection
When selecting inverter, firstly make clear the details regarding the
technical requirements for variable frequency speed adjustment of the
system, applications of inverter and load characteristics and take into
overall consideration the adaptable motor, output voltage, rated output and
other factors, and then select the model meeting your requirements and
determine the running mode.
The basic principle is that the rated load current of the motor cannot
exceed the rated current of the inverter. Generally, the model is selected in
accordance with the capacity of the supporting motor as specified in the
user’s manual, with attention to the comparison of rated currents between
the motor and the inverter. The overload capacity of the inverter makes
sense only for the startup and brake processes. If instantaneous overload
occurs in the running process, the load speed will vary. If there are higher
requirements for the speed precision, please consider a larger one, or
select MD300/320 vector control series.
Fan and pump type: It has lower requirements for the overload capacity.
Since the load torque is proportional to the square of the speed, the load is
slightly light when it is running at low speed (except Roots fan).
Furthermore, this type of load has no special requirements for the precision
of the rotation velocity, thus square torque V/F is selected.
Constant torque load: Most loads have constant torque characteristics but
low requirements in terms of precision of rotation
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