i.2 General Safety
W ARNING!
E le c tric a l S h o c k H azard. W hen a d riv e is ru n n in g a P M m otor, v olta ge c o n tin u e s to b e g e n e ra te d a t the m o to r term in als
a fte r the drive is s h u t o ff w h ile the m o to r c oa sts to stop. Take the p re c a u tio n s d e s c rib e d b e lo w to p re v e n t s h o c k a n d in jury:
• In applications where the machine can still rotate after the drive has fully stopped a load, install a load disconnect
switch on the drive output side to disconnect the motor and the drive.
• Do not allow an external force to rotate the motor beyond the maximum allowable speed or to rotate the motor when
the drive is powered off.
• Wait for at least the time specified on the warning label after opening the load switch on the output side before
inspecting the drive or performing any maintenance.
• Do not open and close the load switch while the motor is running.
• 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 to reconnect the drive to the motor.
Wiring
Yaskawa recommends using ring terminals on all drive models for UL/cUL compliance. Use only the tools
recommended by the terminal manufacturer for crimping.
Transporting the Drive
N O T IC E :
N e v e r stea m cle a n the drive. D u rin g transport, k e e p the drive from c o m in g in to c o n ta c t with salts, fluorine, brom ine,
p h th a la te ester, a n d o th e r s uch h a rm fu l chem icals. F a ilu re to c o m p ly m a y d a m a g e the drive.
•
Motor Application Precautions
■ Standard Induction Motors
Insulation Tolerance
N OTICE:
C o n s id e r m o to r volta ge to le ra n c e le v e ls a n d m o to r in s u la tio n in a p p lic a tio n s w ith an in p u t volta ge o f o v e r 4 4 0 V or
p a rtic u la rly lo n g w irin g distances.
N OTICE:
E n s u re th a t th e m o to r is s u ita b le fo r in v e rte r d u ty a n d /o r the m o to r se rv ic e fa c to r is a d e q u a te to a c c o m m o d a te the a d d itio n a l
h e a tin g w ith th e in te n d e d o p e ra tin g con ditions. A m o to r c o n n e c te d to a P W M d riv e m a y o p e ra te a t a h ig h e r te m p e ra tu re tha n a utility-
fe d m o to r a n d th e o p e ra tin g s p e e d ra n g e m a y re d u c e m o to r c o o lin g capacity.
High-Speed Operation
N OTICE:
M e c h a n ic a l d a m a g e m a y o c c u r w ith the m o to r b e a rin g s a n d d y n a m ic b a la n c e o f the m a c h in e w h en o p e ra tin g a m o to r
b e y o n d its ra te d speed. O pe ra te the m o to r w ith in s p e c ific a tio n s to p re v e n t m o to r dam age.
Low-Speed Range
The cooling fan o f a standard motor should 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. Reduce the
load torque as the motor slows to prevent motor damage from overheat. Use a motor designed specifically for operation
with a drive when 100% continuous torque is needed at low speeds.
Torque Characteristics
Torque characteristics differ compared to operating the motor directly from line power. The user should have a full
understanding o f the load torque characteristics for the application.
Vibration and Shock
The drive allows selection o f high carrier PWM control and low carrier PWM control. Selecting high carrier PWM can
help reduce motor oscillation.
If resonance occurs, install shock-absorbing rubber mounts around the base o f the motor and utilize the Jump frequency
selection to prevent continuous operation in the resonant frequency ranges.
Audible Noise
Noise created during run varies by the carrier frequency setting. When using a high carrier frequency, audible noise from
the motor is comparable to the motor noise generated when running from line power. Operating above the rated r/min,
however, can create unpleasant motor noise.
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YASKAWA ELECTRIC SIEP C710616 33D YASKAWA AC Drive L1000A Technical Manual