YASKAWA P1000 Technical Manual page 37

2.1 Section Safety
NOTICE
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 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 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 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.
Never lift or move the bypass while the cover is open.
This can damage the bypass components.
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YASKAWA SIEP YAIP1B 01B YASKAWA AC Drive – P1000 Bypass Technical Manual 37