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i.2 General Safety
26
YASKAWA ELECTRIC
SIEP C710636 02B YASKAWA U1000 Technical Manual
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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.
• In Open Loop Vector Control for PM motors, the allowable load inertia is approximately 50 times higher than the
motor inertia or less. Contact Yaskawa or your Yaskawa agent concerning applications with a larger inertia.
• When using a holding brake in Open Loop Vector Control for PM motors, release the brake prior to starting the motor.
Failure to set the proper timing can result in speed loss. Not for use with conveyor, transport, or hoist type applications.
• Use the Speed Search function to restart a coasting motor rotating over 200 Hz while in V/f Control.
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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 regenerative 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 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. The U1000 is for use with three-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.
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Notes on Power Transmission Parts (belts, chains, gear boxes, ...)
Installing a drive in a machine that was directly connected to the power supply allows to adjust the machine speed.
Continuous operation above or below the rated speed can wear out lubrication material in gear boxes and other power
transmission parts. In order to avoid machine damage make sure lubrication is sufficient within the whole speed range.
Note that operation above the rated speed can increase the noise generated by the machine.
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