Important Notice: Our web hosting provider recently started charging us for additional visits, which was unexpected. In response, we're seeking donations. Depending on the situation, we may explore different monetization options for our Community and Expert Contributors. It's crucial to provide more returns for their expertise and offer more Expert Validated Answers or AI Validated Answers. Learn more about our hosting issue here.

Can the motor voltage and the motor current (at the output of the drive controller) be measured correctly by means of a digital multimeter?

April 26, 2017controller correctly digital drive means measured motor output voltage

0

Posted

Can the motor voltage and the motor current (at the output of the drive controller) be measured correctly by means of a digital multimeter?

1 Answer

0

Posted

Motor voltage: No, the motor voltage cannot be measured correctly by means of a digital multimeter, as the drive controller presents a pulse-width modulating voltage of the DC bus. Due to technical reasons the digital multimeter is not able to detect the effective value. For measuring the effective value only a moving iron instrument is suitable. The drive controller also presents at code C0052 the effective value of the voltage between the motor phases. b) Motor current: Yes, the effective value of the motor current can be measured by means of a digital multimeter (True-RMS), as the frequency inverter shows a sinusoidal current. The frequency inverter also presents at code C0054 the effective value of the motor current. Can the motor voltage and the motor current be measured correctly by means of a drive controller a) Motor voltage: Yes, the effective value of the motor voltage can be measured by means of a drive controller (code C0052). As an external instrument for measuring the mot