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- Third Assistant Engineer (Steam-Motor-Gas Turbine Plants (Unlimited)) »
- Q536 - Electrical, Electronic, & Control Engineering
219. In order to properly set up programmable motor protection, it is necessary to know the locked rotor current of a motor. Given the illustrated chart of code letters for locked-rotor kVA/HP and the necessary instructions, calculate the estimated locked rotor current for the motor represented by the illustrated motor nameplate using a mid-range value for the code letter, assuming the motor is to run at 440 VAC
The locked-rotor current is calculated using the motor nameplate data (5 HP, 440 V) and the code letter 'H' (6.3-7.1 kVA/HP). A mid-range value of 6.7 kVA/HP yields an estimated locked-rotor current of approximately 43.7 amps, which is the correct answer.
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