YASKAWA L1000A Technical Manual page 18

i.2 General Safety
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.
Do not connect or disconnect wiring to the drive or motor while the power is on.
Failure to comply will result in death or serious injury. Before servicing, disconnect all power to the equipment. The
internal capacitor remains charged even after the power supply is turned off. The charge indicator LED will extinguish
when the DC bus voltage is below 50 Vdc. To prevent electric shock, wait at least five minutes after all indicators are
OFF and measure the DC bus voltage level to confirm safe level.
Do not operate equipment with covers removed.
Failure to comply could result in death or serious injury.
The diagrams in this section may show drives without covers or safety shields to show details. Be sure to
reinstallcovers or shields before operating the drives and run the drives according to the instructions described in this
manual.
Do not perform work on the drive while wearing loose clothing, jewelry or without eye protection.
Failure to comply could result in death or serious injury.
Remove all metal objects such as watches and rings, secure loose clothing, and wear eye protection before beginning
work on the drive.
Do not change wiring, remove covers, connectors or options cards, or attempt to service the drive with power
applied to the drive.
Failure to comply could result in death or serious injury. Disconnect all power to the drive and check for unsafe
voltages before servicing.
Do not allow unqualified personnel to use the equipment.
Failure to comply could result in death or serious injury.
Maintenance, inspection, and replacement of parts must be performed only by authorized personnel familiar with
installation, adjustment and maintenance of AC drives.
Applications using a braking option should wire a thermal relay so that the output contactor opens when the
thermal relay trips.
Inadequate braking circuit protection could result in death or serious injury by fire from overheating resistors.
Do not use improper combustible materials.
Failure to comply could result in death or serious injury by fire.
Attach the drive to metal or other noncombustible material.
18
W ARNING
Fire Hazard
YASKAWA ELECTRIC SIEP C710616 38A YASKAWA AC Drive L1000A Technical Manual