Notes On Motor Operation - YASKAWA V1000 Technical Manual

n Inspection and Maintenance
DANGER! Electrical Shock Hazard. Do not connect or disconnect wiring while the power is on. Failure to comply will result in death or
serious injury. Disconnect all power to the drive, wait at least five minutes after all indicators are OFF, measure the DC bus voltage to
confirm safe level, and check for unsafe voltages before servicing to prevent electrical shock. 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.
CAUTION! Burn Hazard. Do not touch a hot drive heatsink. Failure to comply could result in minor or moderate injury. Shut off the power
to the drive when replacing the cooling fan. To prevent burns, wait at least 15 minutes and make sure the heatsink has cooled to a safe
level.
WARNING! Electrical Shock Hazard. Wait for at least the time specified on the drive warning label after opening the load switch on the
output side before any inspection or maintenance of permanent magnet (PM) motors. Failure to comply could result in death or serious
injury.
WARNING! Sudden Movement Hazard. Install a switch disconnect between the motor and the drive in applications where the machine
can still rotate even though the drive has fully stopped. Unpredictable equipment operation may result in death or serious injury.
WARNING! Sudden Movement Hazard. Do not attempt to move a load that could potentially rotate the motor faster than the maximum
allowable r/min when the drive has been shut off. Unpredictable equipment operation may result in death or serious injury.
NOTICE: Do not open and close the motor disconnect switch while the motor is running, as this may damage the drive.
NOTICE: 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.
n Wiring
All wire ends should use ring terminals for UL/cUL compliance. Use only the tools recommended by the terminal
manufacturer for crimping.
n Transporting the Drive
NOTICE: Prevent the drive from contact with salts, fluorine, bromine, phthalate ester, and other such harmful chemicals. Never steam
clean the drive. Failure to comply may cause damage to the drive components.
u

Notes on Motor Operation

n
Using a Standard Motor
Low Speed Range
The cooling fan of a standard motor is usually designed to sufficiently cool the motor at the rated speed. As the self-cooling
capability of such a motor reduces with the speed, applying full torque at low speed will possibly damage the motor. To
prevent motor damage from overheat, reduce the load torque as the motor slows.
characteristics for a Yaskawa standard motor. A motor designed specifically for operation with a drive should be used
when 100% continuous torque is needed at low speeds.
Insulation Tolerance
Consider motor voltage tolerance levels and motor insulation in applications with an input voltage of over 440 V or
particularly long wiring distances. Contact Yaskawa or your Yaskawa agent for consultation.
High Speed Operation
Problems may occur with the motor bearings and dynamic balance of the machine when operating a motor beyond its rated
speed. Contact the motor or machine manufacturer.
YASKAWA ELECTRIC SIEP C710606 16C YASKAWA AC Drive – V1000 Technical Manual
25% ED (or 15 min)
40% ED (or 20 min)
100
90
80
70
60
Torque
(%)
50
3 6
Figure i.4 Allowable Load Characteristics for a Yaskawa Motor
60% ED (or 40 min)
Continuous operation
20 60
Frequency (Hz)
i.3 Application Precautions
Figure i.4 shows the allowable load
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