Applications With Specialized Motors - YASKAWA E1000 Technical Manual

Audible Noise
Noise created during run varies by the carrier frequency setting. When using a high carrier frequency, audible noise from
the motor is comparable to the motor noise generated when running from line power. Operating above the rated r/min,
however, can create unpleasant motor noise.
■
Using a Synchronous Motor
• Contact Yaskawa or your Yaskawa agent if you plan to use any other synchronous motor not endorsed by Yaskawa.
• A single drive is not capable of running multiple synchronous motors at the same time. Use a standard induction motor
for such setups.
• At start, a synchronous motor may rotate slightly in the opposite direction of the Run command depending on
parameter settings and rotor position.
• The amount of starting torque that can be generated differs by each control mode and by the type of motor being used.
Set up the motor with the drive after verifying the starting torque, allowable load characteristics, impact load tolerance,
and speed control range.
Contact Yaskawa or your Yaskawa agent if you plan to use a motor that does not fall within these specifications.
• Speed Search can be used to restart a coasting motor.
• In Open Loop Vector Control for PM motors, the allowable load inertia moment is approximately 50 times higher than
the motor inertia moment or less. Contact Yaskawa or your Yaskawa agent concerning applications with a larger inertia
moment.

◆ Applications with Specialized Motors

■
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. E1000 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 35D YASKAWA AC Drive E1000 Technical Manual
i.2 General Safety
21