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Motor Starting


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Hello electricalexpert65


The major consideration is usually the voltage during run as any continuous voltage drop is power loss.

Commonly in Australia and New Zealand, the standards call for a maximum of 5% but many target 2% voltage drop during run.


The major concern with voltage drop during start is the effect on other equipment.

Most equipment designed to operate on a 50Hz supply can tolerate a minimum voltage of Vnom - 15%.

If we allow for a 3% drop in the line voltage (bottom end of allowable supply voltage, then you would want to restrict the voltage drop during start to 12%.


Note most motors starters are of areduced voltage type so voltage drop during start does not hame a negative impact on the motor unless you require full DOL torque at start.


Best regards,


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