1.2.3 Running with Frequency higher than Standard Frequency
1.2.4 Vibration of Mechanical Device
1.2.5 Motor Heat and Noise
1.2.6 Voltage-sensitive Device or Capacitor Improving Power Factor at the Output Side
1.2.7 Switching Devices like Contactors Used at the Input and Output terminal
This inverter can provide output frequency of 0Hz to 300Hz. If the user needs to run the inverter
with frequency of more than 50Hz, please take the resistant pressure of the mechanical devices
into consideration.
The inverter may encounter the mechanical resonance point at certain output frequencies,
which can be avoided by setting the skip frequency parameters in the inverter.
Since the output voltage of inverter is PWM wave and contains certain harmonics, the
temperature rise, noise and vibration of the motor will be higher than those when it runs at
standard frequency.
Since the inverter output is PWM wave, if the capacitor for improving the power factor or
voltage-sensitive resistor for lightning protection is mounted at the output side, it is easy
to cause instantaneous over current in the inverter, which may damage the inverter. It is
recommended that such devices not be used.
If a contactor is installed between the power supply and the input terminal of the inverter, it
is not allowed to use the contactor to control the startup/stop of the inverter. If use of such
contactor is unavoidable, it shall be used with interval of at least one hour. Frequent charge
and discharge will reduce the service life of the capacitor inside the inverter. If switching
devices like contactor are installed between the output end of the inverter and the motor, it shall
ensure that the on/off operation is conducted when the inverter has no output. Otherwise the
modules in the inverter may be damaged.
1.2.8 Use under voltage rather than rated voltage
If the MD series inverter is used outside the allowable working voltage range as speciîš¿ed in this
manual, it is easy to damage the devices in the inverter.
When necessary, use the corresponding step-up or step-down instruments to change the
voltage.
power of the inverter is higher than the rated power of the motor, the relevant motor protection
parameters in the in the inverter shall be adjusted, or thermal relay shall be mounted to protect
the motor.
1.2.9 Change Three-phase Input to Two-phase Input
It is not allowed to change the MD series three-phase inverter into two-phase one. Otherwise,
it may cause fault or damage to the inverter.
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