1.2.2 Thermal Protection of Motor
1.2.3 Running above Rated Frequency
1.2.4 Vibration of the Mechanical Device
1.2.5 Pressure-sensitive Device or Capacitor Improving Power Factor at the
1.2.6 Switching Devices like Contactors Used at the Input and Output Ends
1.2.7 Change three phase Input into two phase Input
1.2.8 Altitude and Deration
Output Side
If the ated capacity of the motor , especially when the ratedselected inverter is not matching the r power
Please consider the capability of the mechanical devices when you need the inverter to run at the frequency
If the inverter encounters the resonance point of load device within a certain output frequency range .
Since the inverter output is PWM wave , the capacitor for improving the power factor or pressure-
If the contactor is required to be installed between the inverter and the power supply , it is prohibited to
start or stop the inverter with the contactor . If the user has to use the contactor to start and stop the
inverter , the interval shouldn`t be less than an hour . Frequent charging and discharging may reduce
the service life of the capacitor . If the switches like contactors are equipped between the output
terminal and the motor , make sure to start and stop the inverter when it has no output ,otherwise the
modules in the inverter may be easily damaged .
It is not allowed to change the three phase inverter into two phase one . Otherwise , it may cause fault or
When the altitude is higher than 1000m , the cooling effect of inverter is deteriorated due to the rarefaction
of air , the derating using is necessary and please consult our company for detailed technical support .
damage the inverter .
sensitive resistor for lightening-proof shouldn`t be installed at the output side of the inverter ,otherwise
it is easy to cause transient over current and even damage the inverter . Don`t use it!
You can avoid that by frequency parameters in the inverter .configuring the hopping
higher than 50Hz .
of the inverter is higher than that of the motor ,make sure to adjust the parameters for motor protection in the
inverter or to install thermal relay to protect the motor .
3
Chapter 1 Safety and Cautions
1.2.9 Check the Insulation of the Motor
The cooling fan and the rotor shaft of the non-variable-frequency motor are coaxially connected . When
the rotating speed is reduced , the cooling effect will be poorer . Therefore , a powerful exhaust fan should
be installed or the motor should be replaced with variable-frequency motor to avoid the over heat
of the motor .
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General