Lincoln Electric IDEALARC AC-1200 - Manual (Page 17)

F-2 DIAGRAMS F-2
IDEALARC® AC-1200
AC-1200 SCOTT CONNECTION DIAGRAM
B M13026 N.C. P R IM A R Y S E C . ELEC. WORK 1 7 8 9 10 4 N.D.,N.E. N.C. P R IM A R Y S E C .
ELEC. WORK 1 7 8 9 10 4 N.D.,N.E. TWO SINGLE MACHINES SCOTT CONNECTED 3 PHASE SUPPLY LINES PHASE SEQUENCE A-C-B (N.A.) C B A 100 90 80 N.B. TEASER TRANSFORMER (TRAIL ARC) WORK
TRAIL ARC LEAD ARC TRAVEL AC-1200 OR AC1500
MAIN TRANSFORMER (LEAD ARC) AC-1200 OR AC1500 NOTE: The two arcs must be properly phased relative to each other, if the electrical connections are not as shown above, poor 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: V V Value Relationship If voltages do not agree, recheck all wiring and the proper sequence of the input supply lines. the phase sequence use one of the following methods. 1. Use a phase meter. 2. Use an oscilloscope. 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 future applications. * * PHASE LEAD ARC TRAIL ARC LEAD ARC TO ANGLE TO WORK TO WORK TRAIL ARC 100 o 90 VAC 90 VAC 138 VAC 1.53 x V 80 o 90 VAC 90 VAC 116 VAC 1.29 x V
90 o 90 VAC 90 VAC 127 VAC 1.41 x V If using the 90 o phase angle connection, the phase sequence cannot be determined by voltage measurement. To determine 3. Temporarily reconnect the machine to either the 100 o tap or the 80 o tap and check the voltage per note 2. WARNING CAN KILL
ELECTRIC SHOCK 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.
B
M13026
N.C.
P
R
IM
A
R
Y
S
E
C
.
ELEC.
WORK
1
7
8
9
10
4
N.D.,N.E.
N.C.
P
R
IM
A
R
Y
S
E
C
.
ELEC.
WORK
1
7
8
9
10
4
N.D.,N.E.
TWO SINGLE MACHINES SCOTT CONNECTED
3 PHASE SUPPLY LINES
PHASE SEQUENCE A-C-B (N.A.)
C B A
100
90
80
N.B.
TEASER TRANSFORMER (TRAIL ARC)
WORK
TRAIL
ARC
LEAD ARC
TRAVEL
AC-1200 OR AC1500
MAIN TRANSFORMER (LEAD ARC)
AC-1200 OR AC1500
NOTE: The two arcs must be properly phased relative to each other, if the electrical connections are not as shown above, poor
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:
V V Value Relationship
If voltages do not agree, recheck all wiring and the proper sequence of the input supply lines.
the phase sequence use one of the following methods.
1. Use a phase meter.
2. Use an oscilloscope.
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
future applications.
*
*
PHASE LEAD ARC TRAIL ARC LEAD ARC TO
ANGLE TO WORK TO WORK TRAIL ARC
100 o 90 VAC 90 VAC 138 VAC 1.53 x V
80 o 90 VAC 90 VAC 116 VAC 1.29 x V
90 o 90 VAC 90 VAC 127 VAC 1.41 x V
If using the 90
o
phase angle connection, the phase sequence cannot be determined by voltage measurement. To determine
3. Temporarily reconnect the machine to either the 100
o
tap or the 80 o tap and check the voltage per note 2.
WARNING
CAN KILL
ELECTRIC SHOCK
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.