YASKAWA P1000 Quick Start Manual page 18

i.2 General Safety
Insulation Tolerance
Consider motor voltage tolerance levels and motor insulation in applications with an input voltage of over 440 V or particularly
NOTICE:
long wiring distances.
High-Speed Operation
Problems may occur with the motor bearings and dynamic balance of the machine when operating a motor beyond its rated speed.
NOTICE:
Contact the motor or machine manufacturer.
Torque Characteristics
Torque characteristics differ compared to operating the motor directly from line power. The user should have a full
understanding of the load torque characteristics for the application.
Vibration and Shock
The drive allows selection of high carrier PWM control and low carrier PWM. Selecting high carrier PWM can help reduce
motor oscillation.
Take particular caution when adding a variable speed drive to an application running a motor from line power at a constant
speed. If resonance occurs, install shock-absorbing rubber around the base of the motor and enable the Jump frequency selection
to prevent continuous operation in the resonant frequency range.
Audible Noise
The audible noise of the motor varies based on the carrier frequency setting. However, drive current derating may be required.
When using a high carrier frequency, audible noise from the motor is comparable to the motor noise generated when running
from line power.
Synchronous Motors
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• Contact Yaskawa or a Yaskawa agent when planning to use a synchronous motor not endorsed by Yaskawa.
• Use a standard induction motor when running multiple synchronous motors simultaneously. A single drive does not have
this capability.
• A synchronous motor may rotate slightly in the opposite direction of the Run command at start depending on parameter
settings and rotor position.
• The amount of generated starting torque differs depending on the control mode and motor type. Set up the motor with the
drive after verifying the starting torque, allowable load characteristics, impact load tolerance, and speed control range.
Contact Yaskawa or a Yaskawa agent when planning to use a motor that does not fall within these specifications:
• To restart a coasting motor rotating over 200 Hz while in V/f Control, first use the Short Circuit Braking function to bring
the motor to a stop. Short Circuit Braking requires a special braking resistor. Contact Yaskawa or a Yaskawa agent for
details.
• To restart a coasting motor rotating below 200 Hz, use the Speed Search function if the motor cable is not too long. If the
motor cable is relatively long, stop the motor using Short Circuit Braking.
Specialized Motors
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Multi-Pole Motor
The rated current of a multi-pole motor differs from that of a standard motor, so be sure to check the maximum current when
selecting a drive. Always stop the motor before switching between the number of motor poles. The motor will coast to stop if
a regen overvoltage (ov) fault occurs or if overcurrent (oC) protection is triggered.
18
25% ED (or 15 min)
40% ED (or 20 min)
60% ED (or 40 min)
100
90
80
70
60
Torque
(%)
50
3 6
Figure i.2 Allowable Load Characteristics for a Yaskawa Motor
YASKAWA ELECTRIC TOEP YAIP1U 01B YASKAWA AC Drive - P1000 Quick Start Guide
Continuous operation
20 60
Frequency (Hz)