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YASKAWA
|
YASKAWA AC Drive
CR700
Catalog
|
KAEP C710617 24
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.
■
Explosion-Proof Motor
Both the motor and drive need to be tested together to be
certifi ed as explosion-proof. The drive is not for explosion
proof areas.
An explosion-proof pulse generators (PG) is used for an
explosion-proof with voltage tolerance. Use a specially
designed pulse coupler between the drive and the PG
when wiring.
■
Geared Motor
Continuous operation specifi cations differ by the
manufacturer of the lubricant. Due to potential problems
of gear damage when operating at low speeds, be sure to
select the proper lubricant. Consult with the manufacturer
for applications that require frequencies in excess of the
rated frequency.
■
Single-Phase Motor
Variable speed drives are not designed for operating
single phase motors. Using a capacitor to start the motor
causes high-frequency current to fl ow into the capacitors,
potentially causing damage. A split-phase start or a
repulsion start can end up burning out the starter coils
because the internal centrifugal switch is not activated.
CR
700 is for use only with 3-phase motors.
■
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.
Power Driven Machinery
Continuous operation at low speeds wears on the
lubricating material used in gear box type systems to
accelerate and decelerate power driven machinery.
Note also that operation at a frequency exceeding the
rated frequency can cause problems with the power
transmission mechanism, including audible noise,
performance life, and durability due to centrifugal force.
Application Notes
(continued)