All Test Pro

MCA™ Deenergized Testing

Deenergized Testing & Motor Circuit Analysis (MCA)™

What is MCA?

Motor Circuit Analysis (MCA™) is a deenergized test method to assess the health of the motor. This method can be initiated from the Motor Control Center (MCC) or directly at the motor. The advantage to testing from the MCC is that the entire electrical portion of the motor system, including the connections and cables between the test point and the motor, is evaluated.

MCA how does it work

How Does it Work?

The electrical portion of the 3 phase motor system is made up of the basic motor circuit, which is nothing more than 3 simple RCL circuits (resistive, capacitive, inductive). Each basic circuit represents one phase of the three-phase motor system. Since each phase of the motor system is identical, each basic circuit should respond the same way to an applied signal. This is also true for single-phase and DC motors.

ALL-TEST Pro instruments apply a series of low voltage, non-destructive sinusoidal AC signals through the motor windings and measure the response to these signals. Winding faults are indicated by variances in the response to the applied signal through the windings. This deenergized test takes only a few minutes and can even be performed by an entry-level technician.

The measurements* rendered by MCA™ include:

*Number of measurements depend upon model of MCA instrument.

**Fi is the phase angle of the applied voltage and the resulting flow of current measured in degrees. I/F is the percent reduction in current flow when the applied frequency is exactly doubled.

***Dynamic Stator and Rotor Signature is for testing AC induction with squirrel-cage rotor motors <1000V.

Why Traditional Megohmmeter Testing Isn’t Enough?

Avoid unplanned downtime by proactively and thoroughly testing your motor for faults. This means going beyond the capabilities of a traditional Megohmmeter. Megohmmeter insulation testing will only detect faults to ground. Since only a portion of motor electrical winding failures begin as ground faults, they will go undetected using this method alone. Moreover, surge testing requires the application of high voltages. This can be destructive when testing a motor, making it an unsuitable method for troubleshooting and true predictive maintenance testing.

ALL-TEST Pro offers more complete motor testing than any other options on the market. Our instruments go above and beyond normal testing equipment for accurate, safe, and fast motor testing. Motor testing using an MCA™ tool is very easy to implement, and the test takes less than 3 minutes. Save money and time by proactively detecting developing faults before they cause irreversible motor failures.

Successful Applications Using MCA™

  • AC/DC Motors
  • AC/DC Traction Motors
  • Generators/Alternators
  • Machine Tool Motors
  • Servo Motors
  • Control Transformers
  • Transmission & Distribution Transformers (Virtually Any Size)
  • For Commissioning Testing
  • For Troubleshooting
  • For Reliability Testing

The ALL-TEST Pro Promise

 ALL-TEST Pro is committed to ensuring the reliability of motors in the field and maximizing the productivity of maintenance teams everywhere, backing every ALL-TEST Pro product with unmatched motor testing expertise. Our equipment is used in commercial, government and military institutions worldwide. Applications include AC/DC electric motors, transmission, distribution transformers, machine tool motors, servo motors,
AC/DC traction motors, and more.