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

Страница: 12 / 127

x xi
Environmental
conditions
in combination with
peripheral devices
(continued)
Protecting the
motor
When using a motor with a drive, the motor can be protected using the electronic thermal
control ability of the drive. In addition to the operation level, set the motor type (standard motor
or drive motor). For high-speed motors or water-cooled motors, set a small value for the thermal
time constant and protect the motor in combination with the “cooling system OFF” signal. When
driving several motors with a drive, connect a thermal relay to each motor and turn on the drive’s
electronic thermal relay function. If you connect the motor thermal relay to the motor through
a long cable, a high-frequency current may flow in the wiring due to its increased capacitance.
This could cause the relay to trip at a current lower than the set value for the thermal relay. In
this case, lower the carrier frequency or use an output circuit filter (OFL).
Combination with
peripheral device
wiring
Power factor
correcting
capacitor
Do not install power factor correcting capacitors in the drive primary circuit. (Use a dc reactor
to improve the drive power factor.) Do not use power factor correcting capacitors in the drive
output circuit. An over-current trip will occur, disabling motor operation.
Reducing noise
Use of a filter and shielded wires are typical measures against noise to ensure that electro-
magnetic interference standards are met.
Measures
against surge
currents
If an overvoltage trip occurs while the drive is stopped or operated under a light load, it is
assumed that the surge current is generated by the open/close action of the phase-advancing
capacitor in the power system.
* Connect a dc reactor to the drive.
Megger test
When checking the insulation resistance of the drive, use a 500V megger and follow the
instructions contained in Chapter 7, Section 7.4 “Insulation Test.”
Control circuit
wiring length
When using remote control, limit the wiring length between the drive and operator box to
20 m/65 ft or less, and use twisted or shielded cable.
Wiring length
between drive
and motor
If extended length wiring is used between the drive and the motor, the drive will overheat or trip
as a result of over-current (high-frequency current flowing due to cable capacitance) in the wires
connected to the phases. Ensure that the wiring is shorter than 50 m/162 ft. If this distance must
be exceeded, lower the carrier frequency or include an output circuit filter (OFL).
Wiring size
Select cables with an adequate capacity by referring to the current value or recommended wire
size.
Grounding Securely ground the drive using the grounding terminal.
Selecting drive capacity
Driving standard
motor
Select a drive with a capacity range corresponding to the applicable motor rating as shown in
the standard specifications table for the drive.
When high starting torque is required, or quick acceleration or deceleration needed, select a
drive with a capacity one size greater than the standard.
Driving special
motors
Select a drive that that has a rated current exceeding that of the motor
Transportation and
storage
For details about transportation and storage of the drives, refer to Chapter 1, Section 1.3 “Transportation” and
Section 1.4 “Storage Environment.”
Terms
The following terms are used throughout this manual.
NOTE: This term indicates information which must be taken into account for full efficiency operation of the drive,
and information concerning incorrect operation and settings which can result in accidents.
TIP: This term indicates information that can prove handy when performing certain settings or operations.
REFERENCE: This term indicates a reference to more detailed information.
StockCheck.com