Miller Electric OM-842 - Manuel (Page 38)

OM-842 Page 34
Right/Increase repeatedly to go beyond Program
Number 04. To assign a number when Reset is dis-
played, select Reset and press Left/Decrease.
If four programs are combined
together, it is not necessary for the
user to assign a reset. A reset is
permanently assigned to the fifth
Combine position. NOTE
9. Repeat Steps 7 and 8 as needed to define the desired
function for each Combine position being used.
10. Press Right/Increase when there are no parameters
selected in the Combine Position display. The display
shows:
* D R Y R U N ” C O M B I N E ” *
U S E R E M O T E T O S T A R T
11. If desired, press Start/Increase on the Remote Pend-
ant to carry out a dry run of the combined program (see
Section 5-7 for information on the dry run feature). To
exit the Combine mode, press Right/Increase, and
then Parameter Select when the repeating Combine
mode displays are shown. The microprocessor control
will enter the Ready condition.
SECTION 6 – SEQUENCE OF OPERATION
6-1. Gas Tungsten Arc Welding (GTAW) In
The Automatic Mode
1. Be sure welding power source and related equipment
are installed as instructed in their respective Owner’s
Manuals.
2. Be sure desired weld program (or programs) has been
entered.
3. Place Mode Selector switch in Automatic position.
4. Select and prepare tungsten electrode according to
welding power source Owner’s Manual.
5. Insert electrode into torch.
6. Wear dry insulating gloves and clothing.
7. Connect work clamp to clean, bare metal at workpiece.
8. Turn on shielding gas supply at source.
9. Wear welding helmet with proper filter lens according to
ANSI Z49.1.
10. Energize welding power source.
11. Begin welding, observing the following:
a. Be sure the desired program is active before ex-
ecuting a program. The active program is indicated
in the applicable repeating display (see Section
5-1F). To select a different program, press Param-
eter Select while the repeating displays are shown.
This increases the program number.
b. When the unit is in the Ready condition (see Sec-
tion 5-1F), momentarily press Start/Increase to
begin the weld sequence.
c. The voltage and amperage meters display the
weld voltage and amperage while welding. The
weld sequence displays are shown on the digital
display, with time values changing to reflect events
being carried out.
d. During the Weld Time portion of the program, the
Start/Increase or Decrease push buttons may be
pressed and held to modify the weld current level
within the defined amperage adjustment limits (see
Section 2-4). The programmed values will not be
affected.
e. At any time, the Stop push button may be pressed
to end the weld sequence prematurely and send
the program to postflow.
f. After postflow is timed out, the control unit returns
to the Ready condition and waits for the next clo-
sure of the Start/Increase push button. If
Start/Increase is pressed during postflow, the pro-
gram restarts the weld sequence from the
beginning without preflow timing.
6-2. Gas Tungsten Arc Welding (GTAW) In
The Semi-Automatic Modes
A. Shared Initial Procedure
1. Be sure welding power source and related equipment
are installed as instructed in their respective Owner’s
Manuals.
2. Be sure desired weld program (or programs) has been
entered.
3. Be sure desired Semi-Automatic mode is selected on
DIP switch SW1 (see Section 2-4).
4. Place Mode Selector switch in Semi-Automatic posi-
tion.
5. Select and prepare tungsten electrode according to
welding power source Owner’s Manual.
6. Insert electrode into torch.
7. Wear dry insulating gloves and clothing.
8. Connect work clamp to clean, bare metal at workpiece.
9. Turn on shielding gas supply at source.