YASKAWA A1000 Technical Manual page 45

2.1 Section Safety
NOTICE
Equipment Hazard
Prevent foreign matter such as metal shavings or wire clippings from falling into the drive during drive
installation and project construction.
Failure to comply could result in damage to the drive.
Place a temporary cover over the top during installation. Be sure to remove the temporary cover before start-up, as the
cover will reduce ventilation and cause the unit to overheat.
Observe proper electrostatic discharge (ESD) procedures when handling the drive.
Failure to comply could result in ESD damage to the drive circuitry.
Operating the motor in the low-speed range diminishes the cooling effects, increases motor temperature, and
may lead to motor damage by overheating.
Reduce the motor torque in the low-speed range whenever using a standard blower cooled motor. If 100% torque is
required continuously at low speed, consider using a special drive or vector-control motor. Select a motor that is
compatible with the required load torque and operating speed range.
The speed range for continuous operation differs according to the lubrication method and motor manufacturer.
If the motor is to be operated at a speed higher than the rated speed, consult with the manufacturer.
Continuously operating an oil-lubricated motor in the low-speed range may result in burning.
When the input voltage is 440 V or higher or the wiring distance is greater than 100 meters, pay special
attention to the motor insulation voltage or use a drive-rated motor with reinforced insulation.
Failure to comply could lead to motor winding failure.
Motor vibration may increase when operating a machine in variable-speed mode, if that machine previously
operated at a constant speed.
Install vibration-proof rubber on the motor base or use the frequency jump function to skip a frequency resonating the
machine.
The motor may require more acceleration torque with drive operation than with a commercial power supply.
Set a proper V/f pattern by checking the load torque characteristics of the machine to be used with the motor.
The rated input current of submersible motors is higher than the rated input current of standard motors.
Select an appropriate drive according to its rated output current. When the distance between the motor and drive is
long, use a cable thick enough to connect the motor to the drive to prevent motor torque reduction.
The current rating differs for a motor with variable pole pitches differs from a standard motor.
Check the maximum current of the motor before selecting the drive capacity. Only switch motor poles when the motor
2
is stopped. Switching between motor during run will trigger overcurrent protection circuitry or result in overvoltage
from regeneration, and the motor will simply coast to stop.
When using an explosion-proof motor, it must be subject to an explosion-proof test in conjunction with the
drive.
This is also applicable when an existing explosion-proof motor is to be operated with the drive. Since the drive itself is
not explosion-proof, always install it in a safe place.
Never lift the drive up while the cover is removed.
This can damage the terminal board and other components.
YASKAWA ELECTRIC SIEP C710616 27G YASKAWA AC Drive A1000 Technical Manual 45