EM500 Open-Loop Vector Control Inverter User Manual
7
3
、
Maintenance and inspection can be performed by well-trained technicians only, so as
to avoid personal injury or device damage.
4、 Parameter setting is required if inverter has been replaced. Plug-in & plug-out should
be performed after power-off.
5、 For synchronous motor, it will generate power when in rotation, please wait for at least
10 minutes after it stops rotating, and then disconnect the motor from the inverter,
otherwise there is risk of electric shock.
Attentions
Motor Insulation Inspection
Motor insulation inspection shall be performed before using a motor for the first time or
left unused for some time or during routine inspection, in order to avoid damaging
inverter due to failure of insulation performance of motor winding. Make sure to
disconnect motor cable from inverter during inspection; 500V megohmmeter is
recommended. The obtained insulation resistance from test shall not be lower than 5MΩ.
If the selected motor does not match with inverter in rated capacity, especially when its
rated power is lower than that of inverter, be sure to adjust motor protection parameters of
inverter or install a thermal relay in front of the motor to protect the motor.
Operation at Power frequency
Output frequency of inverter ranges from 0.00 Hz to 600.00 Hz. To use inverter at over
50.00 Hz, please consider the bearing capacity of mechanical device.
Since output voltage of inverter presents a PWM waveform along with some harmonic
waves, the temperature rise, noise and vibration of motor would increase a little in
comparison with the running under power frequency.
Varistor or Power Factor Improvement Capacitor on Inverter Output
Inverter outputs PWM wave. Do not use inverter, if a power factor improvement
capacitor or a lightning varistor is on output side, which may easily result in transient
overcurrent of inverter, or even damage inverter.
Do not use EM500 inverter outside the operating voltage range specified in this manual,
which may easily damage its internal parts. If you have to do so, install a voltage rise or
reduction device for transformation.
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