Magnetic Contactor Installation
WARNING! Fire Hazard. Shut off the drive with a magnetic contactor (MC) when a fault occurs in any external equipment such as braking
resistors. Refer to Installing a Magnetic Contactor at the Power Supply Side on page 368. Failure to comply may cause resistor
overheating, fire, and injury to personnel.
NOTICE: To get the full performance life out of the electrolytic capacitors and circuit relays, refrain from switching the drive power supply
off and on more than once every 30 minutes. Frequent use can damage the drive. Use the drive to stop and start the motor.
Inspection and Maintenance
WARNING! Electrical Shock Hazard. Capacitors in the drive do not immediately discharge after shutting off the power. Wait for at least the
amount of time specified on the drive before touching any components after shutting off the power. Failure to comply may cause injury to
personnel from electrical shock.
WARNING! Electrical Shock Hazard. When a drive is running a PM motor, voltage continues to be generated at the motor terminals after
the drive is shut off while the motor coasts to stop. Take the precautions described below to prevent shock and injury:
• In applications where the machine can still rotate even though the drive has fully stopped a load, install a switch
to the drive output side to disconnect the motor and the drive.
• Do not allow an external force to rotate the motor beyond the maximum allowable speed or to rotate the motor
when the drive has been shut off.
• Wait for at least the time specified on the warning label after opening the load switch on the output side before
inspecting the drive or performing any maintenance.
• Do not open and close the load switch while the motor is running, as this can damage the drive.
• If the motor is coasting, make sure the power to the drive is turned on and the drive output has completely
stopped before closing the load switch.
WARNING! Burn Hazard. Because the heatsink can get very hot during operation, take proper precautions to prevent burns. When replacing
the cooling fan, shut off the power and wait at least 15 minutes to be sure that the heatsink has cooled down. Failure to comply may cause
burn injury to personnel.
Wiring
All wire ends should use ring terminals for UL/cUL compliance. Use only the tools recommended by the terminal manufacturer
for crimping.
Transporting the Drive
NOTICE: Never steam clean the drive. During transport, keep the drive from coming into contact with salts, fluorine, bromine, phthalate
ester, and other such harmful chemicals.
u
Motor Application Precautions
n
Standard Induction Motors
Low-Speed Range
The cooling fan of a standard motor should sufficiently cool the motor at the rated speed. As the self-cooling capability of
such a motor reduces with the speed, applying full torque at low speed will possibly damage the motor. Reduce the load torque
as the motor slows to prevent motor damage from overheat. Figure i.2 shows the allowable load characteristics for a Yaskawa
standard motor. Use a motor designed specifically for operation with a drive when 100% continuous torque is needed at low
speeds.
50
3 6
60
60
70
80
90
100
25% ED (or 15 min)
40% ED (or 20 min)
60% ED (or 40 min)
Frequency (Hz)
Continuous operation
Torque
(%)
20
Figure i.2 Allowable Load Characteristics for a Yaskawa Motor
i.2 General Safety
22
YASKAWA ELECTRIC SIEP C710616 31B YASKAWA AC Drive – A1000 Technical Manual
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