Miller Subarc DC 1000 Посібник користувача - Сторінка 22
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2-16. Matching Primary Lines L1, L2, And L3 When Using Multiple Units
Meter Polarity Does Not Matter
A
B
C
D
E
G
I
J
K
L
N
P
Terminal Strip
TE3
Unit A
(Master)
OM-2221 Page 18
Set on AC Volts Scale
A
B
C
D
E
G
I
J
K
L
N
P
Terminal Strip
TE3
Unit B
(Slave)
L1
L2
Input Contactor
Y Turn Off welding power
source and disconnect input
power before opening ac-
cess door.
This test must be performed on the
units that will be interconnected us-
ing the synchronizing terminal strip
TE4. This refers to the multiple unit
hook-ups shown in Sections 3-2,
3-3, and 3-5.
Power On both units. Using an ac
voltmeter, measure the voltage be-
tween terminal A of terminal strip
TE3 on both units as shown.
If the measured voltage is 0 (zero)
volts, the primary lines are properly
phased.
If the measured voltage is 48 volts,
swap the input conductor connec-
tions to L1 and L3 on the primary in-
put contactor of unit B.
If the measured voltage is 42 volts,
swap L1 and L2 on the primary input
contactor of unit B. The meter will
then read either 48 volts or 24 volts.
If the meter reads 48 volts, swap L1
and L3. If the meter reads 24 volts,
swap L2 and L3.
If the measured voltage is 24 volts,
swap L1 and L2 on the primary input
contactor of unit B. The meter will
then read either 0 (zero) volts or 42
volts. If the meter reads 0 volts, the
primary lines are properly phased.
If the meter reads 42 volts, swap L1
and L2 again, and swap L2 and L3.
When the second (slave) unit's pri-
mary line phase sequences are
matched with the first (master) unit,
test primary phasing between third
unit (if applicable) and second unit.
Always test and correct phasing
between following unit and unit pre-
vious to it.
L3
Ref. ST-801 882-A / Ref. 801 883-B