JUKI SC-921 Instruction Manual page 9

[Changing over the voltage between 100 V and 200 V]
WARNING :
To prevent personal injuries caused by electric shock hazards or abrupt start of the sewing machine,
carry out the work after turning OFF the power switch and a lapse of 5 minutes or more. To prevent
accidents caused by unaccustomed work or electric shock, request the electric expert or engineer of
our dealers when adjusting the electrical components.
* The illustration below shows the PWR-T PCB.
The type of PCB differs by destination.
A
Wiring for the single-phase 100 V
Be sure to connect the wire between 1 and 2.
If it is connected between 1-3 or 2-3, the sewing
machine will be inoperative.
(Box side)
WHITE
BLACK
RED
GREEN/
YELLOW
B
Wiring for the 3-phase 200 V
(Box side)
WHITE
BLACK
RED
GREEN/
YELLOW
C
Wiring for the single-phase 200 V
Be sure to connect the wire between 1 and 2.
If it is connected between 1-3 or 2-3, the sewing
machine will be inoperative.
(Box side)
WHITE
BLACK
RED
GREEN/
YELLOW
1
(Plug side)
1 WHITE
BLACK
2
3
GREEN/
YELLOW
(Plug side)
1
WHITE
2 BLACK
RED
3
GREEN/
YELLOW
(Plug side)
1
WHITE
2
BLACK
3
GREEN/
YELLOW
– 7 –
By making the following two changes, the SC-921 can
be used wth three dfferent power supples, .e., sngle-
phase 100 - 120 V, sngle-phase 200 to 240 V and
3-phase 200 to 240 V.
* Only the control box which uses PWR-T PCB can
be changed.
1 Replacement of the power cords
2 Changing-round of connector 1 on the PWR PCB
1) Turn OFF the power wth the power swtch after
checkng that the sewng machne has stopped.
2) Draw out the power cord from the power receptacle
after checkng that the power swtch has been turned
OFF. Then wat for 5 mnutes or more.
3) Loosen the screws whch are used to secure the
rear lid of the control box cover. Carefully open the
rear cover.
4) Changing procedure of the power voltage
(Caution) If the supply power changing is carried
out in a wrong manner, the control box can
break. Be extremely careful when taking the
supply voltage changing procedure.
A. To change over the supply voltage from 200 - 240 V
to 100 - 120 V
¡ Change the power cord with the JUKI genuine cord
with the part number (M90355800A0). Change
the earth cord wth the one wth the part number
(M90345800A0).
¡ Change over supply voltage changeover connector 1
mounted on the PWR PCB with the connector for 100 V.
¡ Connect the crimp style terminal of AC input cord to
the power plug as shown in the figure A.
B,C. To change over the supply voltage from 100 - 120
V to 200 - 240 V
¡ Change the power cord with the JUKI genuine cord
wth the part number （M90175800A0).
¡ Change over supply voltage changeover connector 1
mounted on the PWR PCB with the connector for 200 V.
¡ Connect the crimp contact of the AC input cord to the
power plug as llustrated n Fg. B for the 3-phase power
supply or as illustrated in Fig. C for the single-phase one.
5) Before closng the rear ld of the cover, ascertan agan
that the relevant parts have been correctly changed
wthout fal.
6) Close the read lid while pressing it, taking care not to
allow the wrng to be caught between the read ld of
the cover and the man body of the control box. Then,
secure the ld wth the screws.
(Caution) Be sure to remove the
Locking section
connector while holding its
locking section with your
fingers. Be extremely care-
ful not to pull the connector
forcibly.