YASKAWA L1000A Technical Manual page 21

Acceleration/Deceleration Ramp
Acceleration and deceleration times are affected by the amount of torque generated by the motor, the load torque, and the
inertia moment. Set a longer accel/decel time when Stall Prevention is enabled. The accel/decel times are lengthened for
as long as the Stall Prevention function is in operation. Install one of the available braking options or increase the capacity
of the drive for faster acceleration and deceleration.
General Handling
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Selecting a Molded Case Circuit Breaker or Ground Fault Circuit Interrupter (GFCI)
Select an appropriate GFCI. This drive can cause a residual current with a DC component in the protective earthing
conductor. Where a residual current operated protective or monitoring device is used for protection in case of direct or
indirect contact, always use an GFCI of type B according to IEC/EN 60755.
Select a MCCB (Molded Case Circuit Breaker) with a rated current that is 1.5 to 2 times higher than the rated current of
the drive in order to avoid nuisance trips caused by harmonics in the drive input current. Also refer to
Case Circuit Breaker (MCCB) on page
WARNING! Sudden Movement Hazard. Install a properly controlled contactor on the input-side of the drive for applications where
power should be removed from the drive during a fault condition. Improper equipment sequencing could result in death or serious
injury.
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
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.
CAUTION! 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.
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 after the drive has fully stopped a load, install a load disconnect
switch on 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 is powered 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.
• 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 to reconnect the drive to the motor.
Wiring
Yaskawa recommends using ring terminals on all drive models 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. Failure to comply may damage the drive.
YASKAWA ELECTRIC SIEP C710616 38F YASKAWA AC Drive - L1000A Technical Manual
369.
i.2 General Safety
Installing a Molded
370. Failure to comply may cause
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