GE Fuji Electric MICRO-SAVER AF-300, Руководство для стартапов

Страница: 11 / 127

viii ix
Precautions for Use
Application with
standard motors
Driving a 460V
standard motor
When operating a 460 V standard motor on a drive with extremely long cables, damage to the
insulation of the motor may occur. Use an output circuit filter (OFL) if necessary after checking
with the motor manufacturer. GE motors do not require the use of output circuit filters because
of their superior insulation.
Torque
characteristics
and temperature
rise
A standard motor will run hotter when operated with a drive than if connected to standard ac
power. Furthermore, the effectiveness of the motor’s cooling fan is reduced in the low-speed
range, which in turn reduces the allowable output torque. (If constant torque is required in the
low-speed range, either use a GE drive motor or a motor equipped with a separate cooling fan.)
Vibration
Use of a drive does not increase vibration of a standard motor, but when the motor is mounted
to a driven load mechanical resonances may be caused by the combined natural frequencies of
the total machine system.
* The use of a rubber coupling or vibration dampening rubber is recommended.
* It is also recommended to use the drive Jump Frequency control function to avoid
operating at resonance points.
Note that operation of a 2-pole motor at 60 Hz or above may cause abnormal vibration.
Noise
When a drive is used with a standard motor, the motor noise level will be higher than that with
a commercial power supply. To reduce noise, raise carrier frequency of the drive. High-speed
operation at 60 Hz or higher frequencies can also result in increased noise.
Application with special
motors
Explosion-proof
motors
When using an explosion-proof motor with a drive, use a only an approved drive/motor
combination.
Submersible
motors and
pumps
This type of motor has a higher current rating than standard motors. Select a drive capacity that
will ensure that these motors run within the rated current capacity of the drive. These motors
also differ from standard motors in their thermal characteristics.
Set a low value in the thermal time constant of the motor when setting the electronic thermal
protection.
Motors fitted
with brakes
Do not use motors with parallel-connected brakes that obtain their braking power from the
primary circuit (commercial power supply). If the brake power is connected to the drive power
output circuit by mistake, problems may occur.
Do not use drives on motors equipped with series-connected brakes.
Using a drive with
special motor types
Gearmotors
When the power transmission mechanism uses an oil-lubricated gearbox or speed changer/
reducer, continuous motor operation at low speed may cause poor lubrication.
Synchronous
motors
Special software suitable for this motor type must be used. Contact GE Fuji for details.
1-phase motors
1-phase motors are not suitable for drive-driven variable speed operation. Use 3-phase motors.
* Even if a 1-phase power supply is available, use a 3-phase motor as the drive only provides
3-phase output.
Installation
location
Use the drive in a location with an ambient temperature range of -10 to 50°C.
The drive and braking resistor surfaces become hot under certain operating conditions. Install
the drive on a nonflammable surface such as metal.
Ensure that the installation location meets the environmental conditions specified in Chapter 2,
Section 2.1 “Operating Environment.”
Environmental
conditions
in combination with
peripheral devices
Installing a GE
Circuit Breaker
(MCCB)
Install a recommended molded-case circuit breaker or a ground-fault circuit interrupter (GFCI)
in the primary circuit of the drive to protect the wiring. Ensure that the circuit breaker rating is
equivalent to or lower than the recommended rating.
Magnetic
contactor in
the secondary
circuit
If a magnetic contactor is mounted in the drive’s secondary circuit for switching the motor to
commercial power, or for any other purpose, ensure that both the drive and the motor are fully
stopped before operating this contactor.
Magnetic
contactor in the
primary circuit
Do not switch on/off the magnetic contactor in the primary circuit more than once an hour as a
drive fault may result.
If frequent starts or stops are required during motor operation, use FWD/REV signals or the
RUN/STOP key.
StockCheck.com