Part No. 729-110-040 Rev. 1.41 | June 2016
© 2016 Nelson Stud Welding, Inc. All Rights Reserved.
27
5.2
Basic Procedure
The process to begin welding using a Nelweld unit is very easy, once the proper electrical connections and gun
connections are established:
Turn the main power switch on the front of the unit to the
ON
position. Wait for the unit to complete its
startup sequence.
Set the desired current and time settings using one of the following 3 methods:
Method 1:
Push
Time/Current Mode
button (
Item 1
in the Front Panel section), and up/down buttons (
Item 4
)
to adjust time and current discretely.
Method 2:
Push
Stud Expert (TM) Mode
button (
Item 2
in the Front Panel section), and up/down buttons
(
Item 8
) to adjust stud diameter and the welder automatically sets the weld current and time using a database.
Method 3:
Push 1 of the 10 preset buttons (
Item 6
in the Front Panel section) to choose one of the factory
presets (see
Factory Preset Table
in the next section).
Adjust other settings by accessing the proper function.
Perform a lift check to verify proper gun lift.
Perform test welds to verify the correct welding settings.
Save any set points, if desired.
After establishing proper setup, production welding may begin.
Lock the unit, if desired.
5.3
Weld Parameters
You can program the unit in 2 ways: (1) directly setting the current and time values; or (2) use the Stud Expert
(tm) mode based on stud diameter.
5.3.1 Setting Current & Reading Current Display
The current setting controls the amperage during the weld, and is displayed in the upper display of the front
panel. It can be adjusted (in 1 amp increments) using the up/down arrow keys to the right of the current
display. As each of these keys re-input power pressed, the current setting will increase or decrease at a faster
rate.
After each weld, the actual current and time will be displayed briefly before the set values are displayed again.
If the display shows an actual weld time of the sum of the front panel time and F2 (short circuit on-time), a cold
plunge may have occurred which could result in an unsatisfactory weld quality. If this condition persists, it is
recommended to set the F31 value, and check the physical condition of the gun for any causes of preventing a
normal drop. If the actual weld time is less than the front panel time, it means the arc shorted early, indicating a
potential improper gun lift setup.
In normal operating modes, the desired setting and the actual current will be the same. In this situation, the
display does not change during or after a weld. However, in conditions where it is not possible for the power
source to deliver the desired current, a warning light will light on the front panel display. This condition may
occur when using high currents with small or excessively long weld cables.
Summary of Contents for ArcCharger N550C DOMESTIC
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