YASKAWA V1000 Series Installation & Start-Up Manual page 39

2.1 Section Safety
NOTICE
Operating the drive 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 non-
Yaskawa motor. If 100% torque is required continuously at low speed,
consider using a special drive or vector motor. Select a motor that is
compatible with the required load torque and operating speed range.
2
Do not operate motors above the maximum rated RPM.
Failure to comply may lead to bearing or other mechanical motor failures.
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 60 Hz, consult with the
manufacturer.
Continuously operating an oil-lubricated motor in the low-speed range may
result in burning.
When the input voltage is 480 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.
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.
YASKAWA ELECTRIC TOEP C710606 09B YASKAWA AC Drive V1000 Installation & Start-Up Manual 39