1 Safety Instructions NICE3000
new
User Manual
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selecting the RCD, you should consider the transient and steady-state leakage current to ground that
may be generated at startup and during running of the controller. You can select an RCD specialized
for suppressing high harmonics or a general-purpose RCD of 300 mA (
is two to four times of
protective conductor current).
2. Motor insulation test
Perform an insulation test on the motor under the following conditions:
● Before the motor is used for the rst time
● When the motor is reused after being stored for a long time
● During periodic inspection
This is to prevent poor insulation of motor windings from damaging the controller. The motor must be
disconnected from the controller during the insulation test. A 500-volt megameter is recommended
for this test, and the insulation resistance must not be less than 5 MΩ.
U V W Motor input terminals
Megameter
Ground
3. Thermal protection of the 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. Running at above mains frequency
The controller can output frequency in the range 0 to 99 Hz. If it is necessary to operate the
controller at frequency higher than the mains frequency (generally 50 Hz), consider the capacity of
the machine.
5. 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.
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