Ac-1200 Scott Connection Diagram; Two Single Machines Scott Connected - Lincoln Electric IDEALARC AC-1200 User Manual

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8 0 o 9 0 V A C 1 0 0 o * I f v o l t a g e s d o n o t a g r e e , r e c h e c k a l l w i r i n g a n d t h e p r o p e r s e q u e n c e o f t h e i n p u t s u p p l y l i n e s . p h a s e a n g l e c o n n e c t i o n , t h e p h a s e s e q u e n c e c a n n o t b e d e t e r m i n e d b y v o l t a g e m e a s u r e m e n t . T o d e t e r m i n e I f u s i n g t h e 9 0 N . C . F r a m e s o f a l l w e l d i n g p o w e r s o u r c e s m u s t b e g r o u n d e d p e r N a t i o n a l E l e c t r i c C o d e . N . B . I n t e r c o n n e c t m a c h i n e s a s s h o w n f o r t h e d e s i r e d p h a s e a n g l e . N . A . T o o b t a i n p r o p e r p h a s e s e q u e n c e a t t h e w e l d i n g a r c s , t h e i n p u t l i n e s e q u e n c e m u s t b e A - C - B . 2 . U s e a n o s c i l l o s c o p e . 1 . U s e a p h a s e m e t e r . t h e p h a s e s e q u e n c e u s e o n e o f t h e f o l l o w i n g m e t h o d s . 9 0 V A C 9 0 o N . D . E l e c t r o d e c a b l e s o f p a r a l l e l e d m a c h i n e s s h o u l d b e c o n n e c t e d t o t h e s a m e r a n g e t a p . o N . E . T h e w e l d c a b l e s f o r e a c h a r c , a n d w o r k m u s t b e o f p r o p e r c a p a c i t y f o r t h e c u r r e n t a n d d u t y c y c l e o f t h e i m m e d i a t e a n d 3 . T e m p o r a r i l y r e c o n n e c t t h e m a c h i n e t o e i t h e r t h e 1 0 0 o t a p o r t h e 8 0 o t a p a n d c h e c k t h e v o l t a g e p e r n o t e 2 . f u t u r e a p p l i c a t i o n s . B 1 2 7 V A C 1 1 6 V A C 1 . 4 1 x V 9 0 V A C 1 . 5 3 x V 9 0 V A C 9 0 V A C 9 0 V A C 1 3 8 V A C R e l a t i o n s h i p * V V a l u e M 1 3 0 2 6 V 1 . 2 9 x V
D o n o t o p e r a t e w i t h c o v e r s r e m o v e d . D o n o t t o u c h e l e c t r i c a l l y l i v e p a r t s . E L E C T R I C S H O C K D i s c o n n e c t i n p u t p o w e r b e f o r e s e r v i c i n g . 9 C A N K I L L N . C . 1 . D o n o t w e l d d u r i n g t h e v o l t a g e m e a s u r e m e n t s . B a c k t h e e l e c t r o d e o u t o f e a c h w i r e d r i v e , t h e n p r e s s t h e N A - 4 s t a r t P H A S E L E A D A R C 2 . V o l t a g e r e a d i n g s b e t w e e n n o z z l e s t o w o r k , a n d n o z z l e t o n o z z l e s h o u l d b e p e r t a b l e : C A U T I O N - V o l t a g e w i l l b e h i g h b e t w e e n t h e t w o e l e c t r o d e n o z z l e s . b u t t o n s . O n l y q u a l i f i e d p e r s o n s s h o u l d i n s t a l l , u s e w e l d i n g w i l l r e s u l t . o r s e r v i c e t h i s e q u i p m e n t . A w a y t o v e r i f y t h e p r o p e r p h a s e a n g l e a n d p h a s e s e q u e n c e i s t o m e a s u r e t h e A . C . v o l t a g e a t t h e w e l d i n g n o z z l e s . A C - 1 2 0 0 O R A C 1 5 0 0 N O T E : T h e t w o a r c s m u s t b e p r o p e r l y p h a s e d r e l a t i v e t o e a c h o t h e r , i f t h e e l e c t r i c a l c o n n e c t i o n s a r e n o t a s s h o w n a b o v e , p o o r T E A S E R T R A N S F O R M E R ( T R A I L A R C ) W O R K T W O S I N G L E M A C H I N E S S C O T T C O N N E C T E D N . B . 4 N . D . , N . E . A N G L E 1 0 W O R K 7 W A R N I N G 8 T O W O R K 1 E L E C . T R A I L A R C A A C - 1 2 0 0 O R A C 1 5 0 0 L E A D A R C T O E L E C . T R A V E L 1 0 8 0 8 9 7 1 W O R K 1 0 0 4 9 0 N . D . , N . E . T R A I L 3 P H A S E S U P P L Y L I N E S L E A D A R C P H A S E S E Q U E N C E A - C - B ( N . A . ) M A I N T R A N S F O R M E R ( L E A D A R C ) C T R A I L A R C B T O W O R K A R C N . C .
ELECTRIC SHOCK
CAN KILL
N.D.,N.E.
TEASER TRANSFORMER (TRAIL ARC)
NOTE: The two arcs must be properly phased relative to each other, if the electrical connections are not as shown above, poor
N.A. To obtain proper phase sequence at the welding arcs, the input line sequence must be A-C-B.
N.B. Interconnect machines as shown for the desired phase angle.
N.C. Frames of all welding power sources must be grounded per National Electric Code.
N.D. Electrode cables of paralleled machines should be connected to the same range tap.
N.E. The weld cables for each arc, and work must be of proper capacity for the current and duty cycle of the immediate and
DIAGRAMS

AC-1200 SCOTT CONNECTION DIAGRAM

TWO SINGLE MACHINES SCOTT CONNECTED

WARNING
Disconnect input power before servicing.
Do not operate with covers removed.
Do not touch electrically live parts.
Only qualified persons should install, use
or service this equipment.
N.C.
ELEC.
1
7
N.B.
8
9
WORK
10
4
AC-1200 OR AC1500
WORK
welding will result.
A way to verify the proper phase angle and phase sequence is to measure the A.C. voltage at the welding nozzles.
1. Do not weld during the voltage measurements. Back the electrode out of each wire drive, then press the NA-4 start
buttons.
CAUTION - Voltage will be high between the two electrode nozzles.
2. Voltage readings between nozzles to work, and nozzle to nozzle should be per table:
PHASE LEAD ARC
ANGLE TO WORK
V
100 o
90 VAC
90 o
90 VAC
80 o
90 VAC
If voltages do not agree, recheck all wiring and the proper sequence of the input supply lines.
o
*
If using the 90 phase angle connection, the phase sequence cannot be determined by voltage measurement. To determine
the phase sequence use one of the following methods.
1. Use a phase meter.
2. Use an oscilloscope.
3. Temporarily reconnect the machine to either the 100 o tap or the 80 o tap and check the voltage per note 2.
future applications.
IDEALARC® AC-1200
3 PHASE SUPPLY LINES
PHASE SEQUENCE A-C-B (N.A.)
C B
A
N.C.
1
7
100
8
90
9
80
10
4
MAIN TRANSFORMER (LEAD ARC)
AC-1200 OR AC1500
TRAIL
LEAD ARC
ARC
TRAIL ARC LEAD ARC TO
TO WORK TRAIL ARC
V Value Relationship
90 VAC 138 VAC 1.53 x V
90 VAC 127 VAC 1.41 x V
90 VAC 116 VAC 1.29 x V
N.D.,N.E.
ELEC.
WORK
TRAVEL
*
B
M13026
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