To prevent underpowering, the supply voltage to an AC motor drive must be checked when additional loads or drives are added to the system.

To prevent underpowering, the supply voltage to an AC motor drive must be checked when additional loads or drives are added to the system.

• A. added to the system
• B. installed
• C. serviced
• D. All of the above

Answer: (D)

When you change the electrical system by adding more load or another drive, you must verify the supply voltage at the motor drive to avoid underpowering. Extra load increases current demand, which can cause voltage to sag along feeders, transformers, and connections. AC motor drives need voltage within a specific range; if voltage drops, the drive may not deliver the required torque, can overheat, or trip protections. This check is relevant whether you’re adding a load, installing new equipment, or servicing existing equipment—any modification that could affect the electrical supply. So, in all these scenarios, checking the supply voltage helps prevent underpowering. That’s why the best choice is All of the above.

When you change the electrical system by adding more load or another drive, you must verify the supply voltage at the motor drive to avoid underpowering. Extra load increases current demand, which can cause voltage to sag along feeders, transformers, and connections. AC motor drives need voltage within a specific range; if voltage drops, the drive may not deliver the required torque, can overheat, or trip protections.

This check is relevant whether you’re adding a load, installing new equipment, or servicing existing equipment—any modification that could affect the electrical supply. So, in all these scenarios, checking the supply voltage helps prevent underpowering. That’s why the best choice is All of the above.