Tag Archives: motors

Perks of Operating Motors With Drives 

Perks of Operating Motors With Drives

drives and motors

MRO Electric and Supply has new and refurbished FANUC motors and Servo drives available. We also offer repair pricing. For more information, please call 800-691-8511 or email sales@mroelectric.com.

Adjustable speed drives (ASDs), or variable-speed drives (VSDs) is used to describe equipment that assists to control the speed of machinery. Usually, they are using in mechanical equipment powered by motors.

The drives offer truthful electrical motor control enabling motor speeds to be increased, decreased and maintained.

Save On Energy:

Due to energy consumption, centrifugal fan and pump loads operated with versatile speed drives are reduced. The horsepower needed to operate the fan is cut by a much larger factor if the speed of the fan is cut in thirds or in half. As everyone knows, energy savings are what machine automation professionals yearn for.

Controlled torque limit:

By using an adjustable speed drive, machinery can be protected from any damage that may occur. The specific amount of torque applied by the motor to a load is able to be fully controlled.

Controlled Starting Current:

Usually when an ac motor is started “across the line,” it takes about as seven-to-eight times to start the motor and load.

 By utilizing an adjustable speed drive, the considerably reduced starting current expands the life of an ac motor. The benefits are less wear & tear on the motor which translates to extend motor life and less motor rewinds.
Governed Stopping:

Governed stopping backs up diminish product loss because of machine-driven wear and tear attributed to shocks to the process.

Reverse Operation:

The requirement for a reversing started is mitigated in regards to utilizing an adjustable speed drive. The reason being is the output phases to the motor can be morphed electronically. Removing the reversing starter terminates its upkeep expense while also minimizing panel space.

Decreased Power Demand on Start:

To begin an AC motor across the line, one is going to need much more power compared to beginning an adjustable speed drive. This is only the case at the start because the power to run the motor at load would be the same regardless of its variable speed.

Adjustable Operating Speed:

Process automation and implementing changes in a process is allowed due to deploying an adjustable speed drive. This also enables beginning at a shortened speed and allows remote acclimation of speed by process controllers.

 

Removal of mechanical drive components:

By using an adjustable speed drive, the likelihood of needing costly mechanical drive components like gearboxes can be mitigated. The AC drive is able to transport the high and/or low speed required by the load with a consistent speed between the motor and load because it’s able to function with an infinite variable speed.

 

Troubleshooting a Fanuc Motor

Here are some basic principles for troubleshooting a FANUC motor circuits with meter or megohm meter. This procedure will show you how to test for shorts in windings, cables, or opens. Before starting to test, make sure to turn all all the power sources to the machine and then disconnect the 3-phase motor lines from the drive end. Visually confirm that there are no problems with the cable and then begin testing.

Testing for a short to ground:

  • Using an Ohm meter: Disconnect all power and amplifiers from machine. Check all three wires at T1, T2, and T3 (all three phases) to the ground wire. The readings for this should be infinite, and if it is zero or reads any continuity then there is a problem with the motor or the cable. For this disconnect the cable and check each separately. Be sure to make sure leads on both ends are not touching anything, including the other leads. Most servo motor shorts can be ready with a regular quality  meter going to at least 10 megaohms.
  • Using a Megohm meter: Disconnect all power from machine. Check all three wires at T1, T2, and T3 (all three phases) to the ground wire. Reading should be between 600-2000 Megohms. Most shorts will be below 20 Megohms. Be careful not to touch the leads or the wires to anything when taking the reading because it can give a false reading. There should be about 1000 Ohms of resistance for each volt of incoming power, but this is not a standard rule. If it is 230meg to 600meg there may be deterioration in the cable.

Testing for Open or Short in the windings:

  • Using an Ohm meter: Disconnect all power from the machine. Put meter on ohms and test T1 to T2, T2 to T3, and T1 to T3. The range should be between 0.3 and 2.0 ohms, with most being at about 0.8 ohms. If it is zero there is a short between the two phases. If it is an open the reading will be infinite or well above 2,000 ohms.
  • Cable and plug notes: Often times the connector on the cable to the motor will get coolant in it. You can dry it out an retest, if it is still bad the inserts will get burn marks in them and cause a slight short, so they need to be replaced. If it is a DC motor, check the brushes. There should be 3-4 round caps to remove around the motor. Under these there is a spring with a square block (brush). Check to see how much is left, they may need to be replaced.

 

MRO Electric has a large stock of FANUC motors available. If you would like a replacement or spare, or if you have any questions, please call 800-691-8511 or email sales@mroelectric.com.
FANUC Motors
FANUC Motors

Rebuild a Fanuc Motor – Model A06B-0131-B075 Process

Gallery of pictures showing the process that it takes to rebuild a Fanuc motor, part number A06B-0128-B675#7008.

Original pictures of the motor. Fan is dirty, all sides show significant use.

fanuc motor repair
fanuc motor repair

Upon disassembling the FANUC servo motor, the residue was found in the stator prompting the removal of the motor shaft. This would have caused a short in the stator once running.

 

The finished product, after the motor is rebuilt and fully tested.

rebuild a fanuc motor
fanuc servo motor repair

 

 

 

 

MRO Electric stocks new and refurbished FANUC CNC Motors. We also provide pre-priced Control Techniques repairs. For more information or to request a quote, please call 800-691-8511 or email sales@mroelectric.com.