Method Of Voltage Changeover - JUKI SC-922 Engineer's Manual

(2) Method of voltage changeover

Changing over the voltage between 100V and 200V
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 100V
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 200V
(Box side)
WHITE
BLACK
RED
GREEN/
YELLOW
C
Wiring for the single-phase 200V
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
(Plug side)
WHITE
1
BLACK
2
3
GREEN/
YELLOW
(Plug side)
WHITE
1
BLACK
2
RED
3
GREEN/
YELLOW
(Plug side)
WHITE
1
BLACK
2
3
GREEN/
YELLOW
– 70 –
The supply voltage can be changed over from the single-
phase 100 - 120V to the single-phase 200 - 240V or to
the 3-phase 200 - 240V through the following two steps:
1 Replacement of the power cords
2 Changing-round of connector
1) Turn OFF the power with the power switch after
checking that the sewing machine has stopped.
2) Draw out the power cord from the power receptacle
after checking that the power switch has been turned
OFF. Then wait for 5 minutes or more.
3) Loosen the screws which are used to secure the rear
cover of the control box. 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 - 240V
to 100 - 120V
¡ Change the power cord with the JUKI genuine cord
with the part number (M90355800A0).
Change the earth cord with the one with the part
number (M90345800A0).
¡ Change over supply voltage changeover connector
mounted on the PWR PCB with the connector
for 100V.
¡ 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-
120V to 200 - 240V
¡ Change the power cord with the JUKI genuine cord
with the part number (M90175800A0).
¡ Change over supply voltage changeover connector
mounted on the PWR PCB with the connector
for 200V.
¡ Connect the crimp contact of the AC input cord to
the power plug as illustrated in Fig. B for the 3-
phase power supply or as illustrated in Fig. C for
the single-phase one.
5) Be sure to ascertain again that the relevant parts have
been correctly changed before closing the rear cover.
6) Close the rear cover while pressing it, taking care not
to allow the wiring to be caught between the rear cover
and the main body of the control box.
Then, secure the rear cover with the screws.
(Caution) Be sure to remove the
Locking section
on the PWR PCB
connector while holding
its locking section with
your. fingers. Be extremely
careful not to pull the
connector forcibly.