YASKAWA V1000 Technical Manual page 23

i.3 Application Precautions
Geared Motor
To avoid gear damage when operating at low speeds or very high speeds, make sure that both the gear and lubricant are
rated for the desired speed range. Consult with the manufacturer for applications that require operation outside the rated
speed range of the motor or gear box.
Single-Phase Motor
Variable speed AC drives are not designed for operation with single phase motors. Using capacitors to start the motor
causes excessive current to flow and can damage drive components. A split-phase start or a repulsion start can end up
burning out the starter coils because the internal centrifugal switch is not activated. The drive is for use with 3-phase motors
only.
Uras Vibrator
Uras vibrator is a vibration motor that gets power from centrifugal force by rotating unbalanced weights on both ends of
the shaft. After considering the points below, consult with a your Yaskawa representative to determine the best solution
for the application.
• Uras vibrator should be used within the drive rated frequency.
• Use V/f Control.
• Increase the acceleration time five to fifteen times longer than would normally be used due to the high amount of load
inertia of an Uras vibrator. Increase drive capacity for applications that require an acceleration time of less than 5 s.
• Drive may have trouble starting due to undertorque that results from erratic torque (static friction torque at start).
Motor with Brake
Caution should be taken when using a drive to operate a motor with a built-in holding brake. If the brake is connected to
the output side of the drive, it may not release at start due to low voltage levels. A separate power supply should be installed
for the motor brake. Motors with a built-in brake tend to generate a fair amount of noise when running at low speeds.
n Power Driven Machinery (decelerators, belts, chains, etc.)
Continuous operation at low speeds wears on the lubricating material used in gear box type systems to accelerate and
decelerate power driven machinery. Caution should also be taken when operating at speeds above the rated machine speed
due to noise and shortened performance life.
YASKAWA ELECTRIC SIEP C710606 16C YASKAWA AC Drive – V1000 Technical Manual 23