Applications With Specialized Motors - YASKAWA T1000A Technical Manual

i.2 General Safety
u Applications with Specialized Motors
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Applications with Specialized Motors

Multi-Pole Motor
Because the rated current will differ from a standard motor, be sure to check the maximum current when selecting a
drive. Always stop the motor before switching between the number of motor poles. If a regen overvoltage fault occurs or
if overcurrent protection is triggered, the motor will coast to stop.
Submersible Motor
Because motor rated current is greater than a standard motor, select the drive capacity accordingly. Be sure to use a large
enough motor cable to avoid decreasing the maximum torque level on account of voltage drop caused by a long motor
cable.
Explosion-Proof Motor
Both the motor and drive need to be tested together to be certified as explosion-proof. The drive is not designed for
explosion proof areas.
Furthermore, if an encoder is attached to an explosion-proof motor make sure the encoder is explosion-proof too. Use an
insulating signal converter for connecting the encoder signal lines to the drives speed feedback option card.
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 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. T1000A is for use with 3-phase motors only.
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.
YASKAWA ELECTRIC SIEP C710616 30B YASKAWA AC Drive T1000A Technical Manual 21