Miller Electric OM-842 - Manuel (Page 36)

OM-842 Page 32
5-7. Dry Run Feature
The Dry Run feature allows a program to be verified by execut-
ing it without actually establishing an arc. All timing and contact
closures are performed without gas, high frequency, or power
source contactor being activated.
The Dry Run feature is only available in the Automatic mode
and Semi-Automatic 1 or 5 modes. When used in the Semi-Au-
tomatic 1 or 5 modes, the weld time continues to increment
until the Start/Increase on the Remote Pendant is pressed.
To use the Dry Run feature, proceed as follows:
1. Access the Dry Run display.
2. Press Start/Increase on the Remote Pendant to begin
the dry run execution.
3. The microprocessor control will perform a dry run of the
program. The dry run stops automatically when the
programmed postflow time elapses. To stop the dry run
before completion, press the Stop push button.
5-8. Stop Watch Feature
The Stop Watch feature is a part of Dry Run when Dry Run is
used in the Automatic mode. Stop Watch allows the operator to
define the end of weld time by pressing the Start/Increase push
button. This enables the operator to observe fixturing during a
dry run and define the end of weld time relative to actual posi-
tions.
To use the Stop Watch feature, proceed as follows:
1. Enter a 0 (zero) for weld time when entering a program
in the Automatic mode.
2. Carry out a dry run of the entered program (see Section
5-7).
3. When the desired end of weld time is reached, press
Start/Increase on the Remote Pendant. The time dis-
played when the push button is pressed becomes the
weld time value in the program and remains so until
changed.
5-9. Linking Programs
The Link feature is only available in
the following modes: Automatic,
Semi-Automatic 1, and Semi-
Automatic 5. NOTE
Existing programs in the required modes can be linked togeth-
er so that the next program in sequence begins when
Start/Increase is pressed on the Remote Pendant. Up to four
programs can be linked. All linked programs must be in the
same mode of operation. The first program desired in the chain
of programs is assigned to position one, the second desired
program is assigned to position two, etc. A reset is assigned to
the Link position following the last program to signal the end of
the linked programs.
If four programs are linked together, it
is not necessary for the user to
assign a reset. A reset is
permanently assigned to the fifth
Link position. NOTE
For example, to run program 2, then program 1, and finally pro-
gram 4, program 2 would be assigned to link position one,
program 1 would be assigned to position two and program 4
would be assigned to position three. A reset would be as-
signed to position four to indicate the end of the linked
programs.
When the Link mode is entered, three displays are repeated in
sequence. This indicates that the Link Ready condition is ac-
tive. These displays must be present in order to start execution
of the linked programs.
To link programs, proceed as follows:
1. Be sure one of the proper modes is selected (see Im-
portant block at beginning of this section).
2. Place the Program/Run/Reset keyed switch in the Pro-
gram position.
3. Call up the following display (this is one of the repeating
displays explained in Section 5-1F).
P R O G R A M # 0 X
U S E R E M O T E T O S T A R T
4. Press Parameter Select to increase the program num-
ber beyond 4. The following repeating Link mode
displays appear:
P R O G R A M ” L I N K ” M O D E
U S E R E M O T E T O S T A R T
U S E I N C / D E C B U T T O N S
T O C H A N G E T H E L I N K S
U S E P A R A M E T E R S E L E C T
T O E X I T ” L I N K ” M O D E
P R O C E S S P O L A R I T Y I S
< X X .>
5. Press Right/Increase, and the display shows:
L I N K P O S I T I O N X X
I S X X X X X X X
6. The Link position (1 through 4) is indicated in the upper
right corner. The second line indicates what function
(either a program number or Reset) is assigned to the
position.
7. To change the number of the Link position, select it and
press either Right/Increase or Left/Decrease to
change the value as desired. As the Link position num-
bers change, the function currently assigned to that
position is displayed in the second line.
8. To change the function assigned to a Link position, se-
lect the function and press either Right/Increase or
Left/Decrease to change the value.