3.7 Main Circuit Wiring
♦ Main Circuit Terminal and Motor Wiring
This section outlines the various steps, precautions, and checkpoints for wiring the main circuit terminals and motor
terminals.
W ARNING!
E le c tric a l S h o c k H azard. B e fo re servicing, d is c o n n e c t a ll p o w e r to the e q u ip m e n t a n d lo c k o u t the p o w e r source. F a ilu re to
c o m p ly m a y re s u lt in in ju ry from e le c tric a l shock. W ait a t le a s t five m in u te s a fte r a ll in d ic a to rs are O F F a n d m e a s u re th e D C bu s
v olta ge le v e l a n d m a in c irc u it te rm in a ls to con firm the c irc u it is safe b e fo re wiring.
W ARNING!
E le c tric a l S h o c k Hazard. Verify m o to r w irin g b a re w ire e n d s do n o t c o n ta c t the d riv e cha s s is o r e n c lo s u re w hen w iring
d riv e te rm in a ls U/T1, V/T2, W/T3. F ailure to c o m p ly m a y re s u lt in s e rio u s in ju ry o r d e a th d u e to e le c tric a l shock.
W ARNING!
E le c tric a l S h o c k H azard. Im p ro p e r e q u ip m e n t g ro u n d in g c o u ld re s u lt in de a th o r s eriou s in ju ry b y c o n ta c tin g the m o to r
case. A lw a y s p ro p e rly g ro u n d th e m o to r-s id e g ro u n d in g term inal.
W ARNING!
F ire Hazard. Tighten a ll te rm in a l screw s to the s p e c ifie d tig h te n in g torque. Lo o se e le c tric a l c o n n e c tio n s c o u ld re s u lt in
de a th o r s e rio u s in ju ry b y fire d u e to o v e rh e a tin g o f e le c tric a l con ne ction s. Im p ro p e rly tig h te n e d te rm in a l sc re w s can also cause
e rro n e o u s e q u ip m e n t operation.
W ARNING!
F ire Hazard. D o n o t u se an im p ro p e r v olta ge source. F a ilu re to c o m p ly c o u ld re s u lt in de a th o r s e rio u s in ju ry b y fire. Verify
th a t the ra te d volta ge o f the drive m a tc h e s the v olta ge o f the in c o m in g p o w e r s u p p ly b e fo re a p p ly in g power.
W ARNING!
D o n o t c o n n e c t the A C p o w e r lin e to the o u tp u t m o to r te rm in a ls o f the drive. F a ilu re to c o m p ly c o u ld re s u lt in de a th o r
s e rio u s in ju ry b y fire as a re s u lt o f drive d a m a g e from lin e v olta ge a p p lic a tio n to o u tp u t term inals.
N O TICE:
E q u ip m e n t Hazard. C o m p ly with p ro p e r w irin g p ra ctices. The m o to r m a y ru n in re v e rs e i f the p h a s e o rd e r is backw ard,
ca u s in g in c o rre c t e le v a to r d ire c tio n m o v e m e n t a n d in ju ry to p e rson nel. C o n n e c t m o to r in p u t te rm in a ls U/T1, V/T2, a n d W /T 3 to drive
o u tp u t te rm in a ls U /T1,V /T2, a n d W /T3. The p h a s e o rd e r fo r the drive a n d m o to r s h o u ld m atch.
N O TICE:
E q u ip m e n t H azard. Im p ro p e r e q u ip m e n t s e q u e n c in g c o u ld s h o rte n u s e fu l life o f the e le c tro ly tic c a p a cito rs a n d c irc u it relays
o f the drive. R e fra in from s w itc h in g an in p u t c o n ta c to r m o re often tha n on ce e v e ry 3 0 m inutes. N o rm a lly the drive I/O s h o u ld b e use d
to stop a n d sta rt the m otor.
N O TICE:
E q u ip m e n t H azard. S ta n d a rd m o to rs u s e d with P W M drive s m a y e x p e rie n c e w in d in g failure s due to su rg e voltages, w hen
in p u t lin e volta ge is g re a te r tha n 4 8 0 V o r m o to r w ire d ista n ce is g re a te r tha n 100 m eters. S e le c t a m o to r d e s ig n w ith in s u la tio n tole ran t
o f surg e volta ge s a n d d riv e -ra te d m o to r fo r use w ith P W M drives. F a ilu re to c o m p ly c o u ld le a d to m o to r w in d in g failure.
N O TICE:
D o n o t u se the n e g a tiv e D C b u s t e r m in a l"-" as a g ro u n d term inal. This te rm in a l is a t h ig h D C volta ge po tentia l. Im p ro p e r
w irin g c o n n e c tio n s c o u ld d a m a g e the drive.
N O TICE:
Im p ro p e r a p p lica tio n o f d e v ic e s on drive o u tp u t circu its can d a m a g e the drive. D o n o t c o n n e c t u n a p p ro v e d L C o r R C
in te rfe re n c e su p p re s s io n filters, capacitors, g ro u n d fa u lt circuits, o r o v e rv o lta g e p ro te c tio n d e vice s to the o u tp u t o f the drive.
N O TICE:
D o n o t c o n n e c t p h a s e -a d v a n c in g c a p a cito rs o r L C /R C n o is e filte rs to the o u tp u t circuits. F ailure to c o m p ly c o u ld re s u lt in
d a m a g e to the drive, p h a s e -a d v a n c in g capacitors, L C /R C n o is e filte rs o r g ro u n d fa u lt c irc u it in te rrup te rs.
N O TICE:
P ro p e rly in te g ra te a u x ilia ry co n ta cts in to the c o n tro l lo g ic c irc u it to a v o id u n n e c e s s a ry fa u lt d isp la ys c a u s e d b y c o n ta c to rs o r
o u tp u t s w itc h e s p la c e d b e tw e e n drive a n d m otor. Im p ro p e r in s ta lla tio n o f in p u t a n d o u tp u t co n ta cto rs c o u ld re s u lt in d a m a g e to the
drive.
N O TICE:
B e fo re a p p ly in g p o w e r to the drive, use p o w e r-o ff re s is ta n c e ch e c k s to c h e c k fo r s h o rt-c irc u its b e tw e e n (R/L1, S/L2, a n d
T/L3) o r b e tw e e n m a in c irc u it te rm in a ls a n d ground. F a ilu re to c o m p ly m a y re s u lt in d a m a g e to th e drive.
■
Cable Length Between Drive and Motor
Voltage drop along the motor cable may cause reduced motor torque when the wiring between the drive and the motor is
too long, especially at low frequency output. This can also be a problem when motors are connected in parallel with a
fairly long motor cable. Drive output current will increase as the leakage current from the cable increases. An increase in
leakage current may trigger an overcurrent situation and weaken the accuracy o f the current detection.
Adjust the drive carrier frequency according to
Table 3.4
. If the motor wiring distance exceeds 100 m (328 ft.) because of
the system configuration, reduce the ground currents.
Refer to C6-03: Carrier Frequency on page 152.
Table 3.4 Cable Length Between Drive and Motor
Cable Length
50 m (164 ft.) or less
100 m (328 ft.) or less
Greater than 100 m (328 ft.)
Carrier Frequency
15 kH z or less
5 kH z or less
2 kH z or less
N ote: W hen setting carrier frequency for drives running multiple motors, calculate cable length as the total w iring distance to all
connected motors.
60
YASKAWA ELECTRIC SIEP C710616 33D YASKAWA AC Drive L1000A Technical Manual