Hanbell RC2-D, Technical Manual

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RC2-D Technical Manual
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Instantaneous operation: Rated voltage ±10%.
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Frequency: Rated frequency ±2%.
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Unbalanced voltage of each phase: ± 1%.
Note: An additional high&low voltage protector shall be set up in the unstable voltage area.
Setting the rated voltage within the range of ± 5% can ensure the safe and long -term
operation of the compressor.
3) Unbalanced voltage
Voltage unbalance is usually caused by load change. When the load of each phase is different, voltage
unbalance will appear which may cause serious damage to the motor. NEMA is defined as voltage
unbalance as follows:
Voltage unbalance
=
Difference between average voltage and maximum
voltage in three phase voltage
*100%
Average voltage

According to NEMA, the best operation condition of multiphase motor is that the voltage unbalance of
motor is not more than 1%. In addition, it is recommended not to start the motor when the voltage
imbalance exceeds 5%, which may cause serious damage to the motor.
4) Contactor selection
Please select the appropriate contactor according to AC3 specification, compressor selection program
and system design status.
5) Grounding requirements
There is a grounding connector in the wire box, please connect it to the grounding terminal of the
system control panel accurately.
Note:
A. The setting value of normal leakage protector should be higher than 50mA; In humid environment,
25mA is better.
B. The grounding voltage shall not exceed 50V; not exceed 25V in humid environment
C. The grounding resistance should not exceed 500Ω.
D. Air circuit breaker is usually equipped with electronic leakage protection; please refer to the relevant
settings to ensure its normal operation.
E. If the electronic leakage protector alarm, please check whether the insulation device is normal and
whether its circuit and setting are correct. Please make sure there is no error before turning on the power.
If there is any problem, please contact the equipment supplier.
4.3 MCC&LRA
Starting current definition (LRA): add rated frequency, and rated voltage to the motor coil, block or
restrain the motor rotors so that the motor cannot rotate, the current of the motor at this time is called
the starting current (also known as locked rotor ampere).