i.2 General Safety
Repetitive Starting/Stopping
Elevators and other applications with frequent starts and stops often approach 150% of their rated current values. Heat
stress generated from repetitive high current will shorten the life span o f the IGBTs. The expected lifetime for the IGBTs
is about 8 million start and stop cycles with a 2 kHz carrier frequency and a 150% peak current.
Yaskawa recommends lowering the carrier frequency, particularly when audible noise is not a concern. It is beneficial to
reduce the load, increase the acceleration and deceleration times, or switch to a larger drive to help keep peak current
levels under 150%. Be sure to check the peak current levels when starting and stopping repeatedly during the initial test
run, and make adjustments accordingly.
■ Installation
Enclosure Panels
Keep the drive in a clean environment by installing the drive in an enclosure panel or selecting an installation area free of
airborne dust, lint, and oil mist. Be sure to leave the required space between drives to provide for cooling, and take proper
measures so the ambient temperature remains within allowable limits and keep flammable materials away from the drive.
Yaskawa offers protective designs for drives that must be used in areas subjected to oil mist and excessive vibration.
Contact Yaskawa or your Yaskawa agent for details.
Installation Direction
N O TICE:
In s ta ll the drive u p rig h t as s p e c ifie d in the m anual.
Refer to Mechanical Installation on page 35
fo r m o re in fo rm a tio n
on in sta lla tion . F ailure to c o m p ly m a y d a m a g e the d riv e d u e to im p ro p e r cooling.
■
Settings
DC Injection Braking
N O TICE:
E xc e s s iv e c u rre n t d u rin g D C In je c tio n B ra k in g a n d e x c e s s iv e d u ra tio n o f D C In je ctio n B ra k in g can ca u se m o to r overheating.
A d ju s t D C In je ctio n p a ra m e te rs to p re v e n t m o to r o ve rhe ating .
Acceleration/Deceleration Ramp
Acceleration and deceleration times are affected by the amount o f torque generated by the motor, the load torque, and the
inertia moment. Set a longer accel/decel time when Stall Prevention is enabled. The accel/decel times are lengthened for
as long as the Stall Prevention function is in operation. Install one of the available braking options or increase the
capacity o f the drive for faster acceleration and deceleration.
■ General Handling
Selecting a Molded Case Circuit Breaker or RCD/RCM Devices
Where an RCD (residual current device) or RCM (residual current monitor) at the drive power supply side is used for
protection in case o f direct or indirect contact, only an RCD or RCM of type B according to IEC 60755 is allowed.
Select a MCCB (Molded Case Circuit Breaker) or RCD/RCM with a rated current that is 1.5 to 2 times higher than the
rated current o f the drive in order to avoid nuisance trips caused by harmonics in the drive input current. Also refer to
Installing a Molded Case Circuit Breaker (MCCB) on page 306.
W ARNING!
S u d d e n M o v e m e n t Hazard. In s ta ll a p ro p e rly c o n tro lle d c o n ta c to r on the in p u t-s id e o f the d riv e fo r a p p lic a tio n s w here
p o w e r s h o u ld b e re m o v e d from the drive d u rin g a fa u lt condition. Im p ro p e r e q u ip m e n t se q u e n c in g c o u ld re s u lt in de a th o r seriou s
injury.
W ARNING!
F ire Hazard. S h u t o ff the drive with a m a g n e tic c o n ta c to r (M C ) w h en a fa u lt o c c u rs in a n y e x te rn a l e q u ip m e n t such as
b ra k in g resistors. R e f e r t o I n s t a l l i n g a M a g n e t i c C o n t a c t o r a t t h e P o w e r S u p p ly S id e o n p a g e 3 0 7 . F ailure to c o m p ly m a y
ca u s e re s is to r o v e rh e a tin g , fire, a n d in ju ry to person nel.
N O TICE:
To g e t th e fu ll p e rfo rm a n c e life o u t o f the e le c tro ly tic c a p a c ito rs a n d c irc u it re la y s , re fra in from s w itc h in g the drive p o w e r
s u p p ly o ff a n d on m o re tha n on ce e v e ry 3 0 m inutes. F re q u e n t use can d a m a g e the drive. Use th e d riv e to stop a n d sta rt the m otor.
Inspection and Maintenance
W ARNING!
E le c tric a l S h o c k H azard. C a pa citors in the d riv e do n o t im m e d ia te ly d is c h a rg e a fte r s h u ttin g o ff the pow er. W ait fo r at
le a s t the a m o u n t o f tim e s p e c ifie d on the drive b e fo re to u c h in g a n y co m p o n e n ts a fte r sh u ttin g o ff th e pow er. F a ilu re to c o m p ly m a y
ca u s e in ju ry to p e rs o n n e l from e le c tric a l shock.
CAUTION!
B urn H azard. B e c a u s e the h e a ts in k c an g e t v e ry h o t d u rin g op era tion, take p ro p e r p re c a u tio n s to p re v e n t burns. W hen
re p la c in g the c o o lin g fan, s h u t o ff the p o w e r a n d w a it a t le a s t 15 m in u te s to b e sure th a t the h e a ts in k h a s c o o le d down. F a ilu re to
c o m p ly m a y ca u se b u rn in ju ry to person nel.
YASKAWA ELECTRIC SIEP C710616 33D YASKAWA AC Drive L1000A Technical Manual
19