Changing Over The Voltage Between 100 V And 200 V - JUKI SC-920 Instruction Manual

1. 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
❶
(Plug side)
1
WHITE
BLACK
2
3
GREEN/
YELLOW
(Plug side)
1
WHITE
2 BLACK
RED
3
GREEN/
YELLOW
(Plug side)
1
WHITE
BLACK
2
3
GREEN/
YELLOW
– 2 –
Depending on specifications of the control box, the
number of phases and the voltage of the power supply
can be changed over among "single-phase 100 - 120 V,"
"single-phase 200 - 240 V" and "3-phase 200 - 240 V."
① Replacement of the power cords
② Changing-round of connector ❶ on the PWR PCB
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 recepta-
cle after checking that the power switch has been
turned OFF. Then wait for 5 minutes or more.
3) Loosen the screws which fix the cover of the control
box. Open the cover in a slow manner.
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 genu-
ine cord with the part number (M90355800A0).
Change the earth cord with the one with the part
number (M90345800A0).
• Change over supply voltage changeover connec-
tor ❶ mounted on the PWR PCB with the connec-
tor 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 with the part number (M90175800A0).
• Change over supply voltage changeover connec-
tor ❶ mounted on the PWR PCB with the connec-
tor for 200 V.
• 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) Before closing the door, check to be sure again that
the voltage has been changed without mistake.
6) Close the back lid and secure with the screws
pressing the lid, while taking extra care to prevent
the cord from being caught between the cover and
the main body of the control box.
(Caution)
Be sure to remove the connec-
tor while holding its locking
section with your fingers. Be
extremely careful not to pull
the connector forcibly.
Locking section