Miller Subarc DC 1000 Benutzerhandbuch - Seite 22

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2-16. Matching Primary Lines L1, L2, And L3 When Using Multiple Units

Meter Polarity Does Not Matter

Terminal Strip

TE3

Unit A

(Master)

OM-2221 Page 18

Set on AC Volts Scale

Terminal Strip

TE3

Unit B

(Slave)

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.

Ref. ST-801 882-A / Ref. 801 883-B