7-19
7.4.6 Motor runs unbalanced
7.4.5 Motor overheating
Y E S
Y E S
N O
Y E S
Y E S
N O
N O
Y E S
N O
Is lo a d o r c u rre n t e x c e e d in g
th e s p e c ifie d v a lu e?
Consider reducing the load and increasing
the size of the AC drive and motor
M o to r O v e rh e a tin g
Is m o to r ru n n in g a t lo w s p e e d
fo r a lo n g tim e?
M o to r v o lta g e b e tw e e n o u t p u t
t e r m i n a l s c o rre c t?
Is there anything near the motor
preventing cooling of the motor?
In c o rre c t c o n n e c tio n b e tw e e n
AC drive a n d th e m o to r
S e le c t th e m o to r a g a in
Drive fa u lts
C le a r th e d e b ris
C o rre c t th e c o n n e c tio n
N O
Y E S
N O
N O
Y E S
N O
Y E S
Y E S
N O
O ccu rs d u rin g
a cce le ra tio n ?
M o to r ru n s u n b a la n c e d
Is th e a cce le ra tio n
tim e se t co rre ctly?
A re th e o u tp u t vo lta g e s
b e tw e e n o u t p u t t e r m i n a l s
b a la n ce d ?
Is th e lo a d flu ctu a tin g ?
A n y m e ch a n ica l vib ra tio n o r
g e a r b a ckla sh?
In cre a se th e A cc/ D e c tim e
R e d u ce th e lo a d o r in cre a se size
o f th e AC drive a n d th e m o to r.
AC drive fa u lts
R e d u ce th e lo a d flu ctu a tio n
o r a d d a flyw h e e l.
In sp e ct m e ch a n ics o f
th e syste m
AC drive fa u lts
Y E S