Inputs on the 24V DC Power Models
can be configured as digital, 0-10V DC analog or high-speed counters. Up to 8 analog inputs with 10-bit resolution and up to 6 HSC
100kHz can be configured. Every FT1A controller is equipped with an embedded real-time clock for time-controlled applications.
With the built-in, realtime clock, log data can also be tracked and, with just a click, daylight savings time can easily be
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.
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
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
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.