NICE5000 User Manual 1 Safety Information and Precautions
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controller. You can select a specialized RCD with the function of suppressing high
harmonics or a general-purpose RCD with relatively large residual current.
2. Motor insulation test
Perform the insulation test when the motor is used for the rst time, or when it is reused
after being stored for a long time, or in a regular check-up, in order to prevent the
poor insulation of motor windings from damaging the controller. The motor must be
disconnected from the controller during the insulation test. A 500-V mega-Ohm meter is
recommended for the test. Ensure that the insulation resistance is not less than 5 MΩ.
U V W
Megameter
Motor input
terminals
Ground
3. Thermal protection of motor
If the rated capacity of the motor selected does not match that of the controller,
especially when the rated power of the controller is greater than that of the motor, adjust
the motor protection parameters on the operation panel of the controller or install a
thermal relay for the motor circuit for protection.
4. Motor heat and noise
The output of the controller is pulse width modulation (PWM) wave with certain harmonic
wave, and therefore, the motor temperature rise, noise, and vibration are slightly greater
than those at running with the mains frequency.
5. Voltage-sensitive device or capacitor on the output side of the controller
•
The controller outputs PWM waves, and therefore, do not install the capacitor for
improving power factor or lightning protection voltage-sensitive resistor on the output
side of the controller. Otherwise, the controller may suffer transient overcurrent or even
be damaged.
M
U V W
Capacitor or
varistor
Controller
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