LEESON Electric Frequently Asked Questions FAQs Distributors
LEESON Electric Frequently Asked Questions FAQs Distributors
LEESON Electric Frequently Asked Questions FAQs Distributors
LEESON Electric Frequently Asked Questions FAQs Distributors
February 03, 2009

ABB Soft Starter

ABB Soft Start PSTX combines many years of research and product development with extensive knowledge of application specific requirements and needs. The PSTX is our latest advancement in motor control and protection and adds new functionality with increased reliability to any motor starting application. The PSTX helps you use your process to its fullest potential. Many features like torque control, jog with slow speed and pump cleaning were designed to deal

Sentrol Contacts

The 1085T Series is ideal for residential and commercial applications where terminal connections are preferred. The unit features positive clamping terminals with anti-rotation lugs and captured screws with combination heads. These features allow for easy, quick installations. The positive terminals do not require washers that can corrode or increase resistance. The captured screws cannot be accidentally removed and lost, and they incorporate heads

LEESON Electric

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LEESON Electric

(800) 894-0412       (888) 723-4773 (Fax)
info@clrwtr.com

LEESON Electric, the world's most customer-focused motor, gearmotor and drives company, has expanded our product offering with the addition of the Lincoln Motors, Grove Gear and Electra-Gear products. By using 'virtual inventory', LEESON can offer the right product at the right place at the right time by using 23 fully stocked warehouse facilities nationwide.

At LEESON Electric, our science is gear reducers. From worm to helical-bevel and every species in between, we have mastered GEAROLOGY. Each knowledgeable member of our sales team is a trained GEAROLOGIST and can expertly guide you to the perfect product for your application.

This page consists of some answers for the LEESON Electric product line FAQs. please call us on (800) 894 - 0412 or email us at info@clrwtr.com if you cannot find the answer to your LEESON Motor questions.

What is the importance of a space heater and what affect does it have on warranty?

Electric motors frequently have space heaters installed, at the customer's request, to prevent moisture condensation in the motor when it is not running. In applications where the possibility of condensation is not a factor, or where continuous operation of the motor prevents the formation of condensation, space heaters are not necessary.

LEESON Electric's warranty policy covers manufacturing defects, and allows for repair or replacement to remedy any situations which may arise within the warrantable period. The failure of a motor due to condensation does not fall into this category, and is therefore not considered for warranty coverage. If the project plans and specifications do not require space heaters, then the space heaters present in the unit may be left unconnected and the space heater warranty nameplate may be removed. However, as previously stated, motor failure due to condensation is not warrantable.

What are the advantages and disadvantages when employing the use of trickle voltage heating rather than conventional space heaters?

Yes, trickle voltage heating has some distinct advantages, especially when applied in the field after the motor is built. Compared to space heaters this device compares favorably in cost and provides improved heat distribution throughout the winding.

After storing my motor for an extended period of time, I am now ready to install it. Is there any specific inspection procedure that must be followed?

Yes. Following storage, an extensive inspection must be performed on a motor by one of LEESON Electric's authorized service stations. This inspection must include the following elements:

  • Render an external inspection of the motor to assure the unit is clean, ventilation openings are free of obstructions, and no damage has occurred.
  • Perform a megger test of motor windings to insure satisfactory insulation resistance.
  • Rotate the shaft to check for roughness in bearings or interference between rotating and stationary parts.
  • Perform a bench test on the unit to check for excessive amp. draw, noise, or vibration.
  • Re-grease the motor bearings (as applicable) in accordance with the unit's operating instruction folder.
  • LEESON Electric's authorized service station must install a plate/tag indicating the date of inspection. This tag will be considered a new factory date code for warranty purposes.
  • Make any corrections which inspection shows to be needed.

My motor has a connection plate which says Dual Voltage, Wye Start, Delta Run with PWS (Part Winding Start) on the Low Voltage. How should I hook it up?

This motor has very good versatility and may be used in Several Power Supply Applications. It is a dual voltage machine and may be used on either voltage as defined on the connection plate. It is designed for use on a Wye Start, Delta Run starter. This is A Special Motor Contactor which starts the motor on its Wye connection to limit the inrush and then switches to Delta for running. The motor must not be run on the Wye connection for more than 30 seconds as severe winding damage may occur. This motor may also be started across the line and run on the Delta connection. In addition, the motor may be used on the low voltage connection as a part-winding start motor, also to limit the inrush required. After a brief period, it is switched to the full winding.

What is the typical life expectancy of an AC Motor?

Engineers are occasionally asked to predict average motor life or mean time between failures for a given Three-Phase Induction Motor. A reasonable answer can be obtained if the numerous variables that affect motor life are quantified, such as:

  • Supply voltage and frequency: Although NEMA MG1-12.44.1 stipulates that motors must tolerate +-10% voltage variation and +-5% frequency variation; the motor should be operated at nameplate voltage and frequency for optimum life.
  • Supply source: Supply voltage waveforms should be sinusoidal, balanced within 1%, per NEMA MG1-12.45, with rise times greater than 2 milliseconds and contain less than 2% total harmonic voltage distortion (typical of 'clean' utility power). This reduces turn-to-turn, coil-to-coil, and phase-to-ground voltage stress and prolongs motor insulation life. Hard-switching solid-state inverters must be equipped with output-side inductive filters with >5% impedance to provide a comparable waveform.
  • Motor environment: The motor must be installed in an environment that is appropriate for the motor enclosure. Ambient temperature should remain between (0 and 40)C and elevation at 3300 ft or less. Motor ventilation must not be obstructed and mechanical shock and vibration must be held to a minimal level.
  • Bearing maintenance: Motor bearings must be properly lubricated per IOM published guidelines, with water and contaminants kept to a minimum. Bearing loads should be controlled to provide a minimum B-10 life of 25,000 hours and bearings must be replaced periodically to prevent permanent motor damage. Shaft voltages (caused by unbalanced line voltage or operation from inverter power) must be limited to 0.5 volts peak.
  • Motor Starting: Across-the-line starts should be kept to a minimum and not exceed NEMA MG1-12.54 guidelines, since the life of a motor is affected by the number of across-the-line starts. When the above conditions are met, the insulation life of the motor can be estimated with reasonable accuracy. In 1980 the US Department of Energy published report DOE / CS-0147 to define the average expected life of electric motors.

How can motors in service be relubricated?

Units are prelubricated at the factory and do not require initial lubrication. Relubricating interval depends upon speed, type of bearing and service. Operating conditions may dictate more frequent lubrication. Motor must be at rest and electrical controls should be locked open to prevent energizing while motor is being serviced. If motor is being taken out of storage, refer to storage procedures.

To relubricate bearings, remove the drain plug. Inspect grease drain and remove any blockage with a mechanical probe taking care not to damage bearing. Under no circumstances should a mechanical probe be used while the motor is in operation. Remove any and all dirt and debris from grease inlet and add new grease at the grease inlet. New grease must be compatible with grease already in the motor. Run the motor for 15 to 30 minutes with the drain plug removed to allow purging of any excess grease. Shut off unit and replace the drain plug. Return motor to service. Typical standard grease is Exxon Polyrex EM which is a polyurea type grease.

Note: Overgreasing can cause excessive bearing temperatures, premature lubricant breakdown and bearing failure. Care should be exercised against overgreasing.

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LEESON Electric Frequently Asked Questions
LEESON Electric Frequently Asked Questions
LEESON Electric Frequently Asked Questions
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