Measuring an electric motor using the offline method

Speaks for itself this message on the screen of our MotorAnalyzer R2, but we still sometimes see people “forgetting” to disconnect the electric motor from the power cable or MCC (Motor Control Centre).

When measuring an electric motor using the offline method, it is important to disconnect the motor from the MCC (Motor Control Centre) or power cable. This is done partly to ensure the safety of those carrying out the measurement and prevent damage to the equipment.

Here are a few reasons why this is done:

Safety: Disconnecting the motor from the MCC and power supply is an essential safety measure. It prevents the motor from turning on unexpectedly during the measurement process, which could cause serious injury or electric shock.

Isolation: Disconnecting the motor from the MCC and power supply isolates the motor from external electrical sources. This is important to ensure that the measurements taken reflect the true characteristics of the motor, unaffected by external factors.

Accuracy: Measuring an electric motor using the offline method often requires sophisticated measuring equipment. Disconnecting the motor from the MCC and power supply minimises electrical interference and provides more accurate measurement results. disconnecting the motor from the MCC and power supply is a task that should be performed by qualified personnel with knowledge of electrical engineering and proper safety procedures. This ensures that measurements are carried out in a safe and reliable manner.

In certain cases, it is not possible to disconnect the power cable directly, think of pumps, this one wants to test when they are still installed. Take into account that a surge test, for example, does not give good measurements, as the connecting cable affects the surge measurement.