Part No. 729-110-040 Rev. 1.41 | June 2016
© 2016 Nelson Stud Welding, Inc. All Rights Reserved.
28
5.3.2 Setting Time & Reading Time Display
The time setting is displayed on the front panel lower display. It can be adjusted in 1 millisecond (or 0.001
second) increments using the up/down arrow keys to the right of the time display. As each of these keys re-
input power pressed, the time setting will increase or decrease at a faster rate. The time display is used to
display both the desired time setting and the actual weld time.
In normal operating modes, the desired setting and the actual weld time will be the same. When this is the
case, the display does not change during or after a weld. However, if an error condition occurs, the proper
error code will be displayed on the front panel display. This will typically happen if a weld is aborted early.
5.3.3 Lift Distance & Plunge Distance Diameters
The mechanical parameters must be set on the NS40 Standard Duty or 650 Light Duty drawn arc guns.
See the operating manual of the corresponding weld gun for the settings.
See the gun operating instructions and diagrams below for the guide values for the welding method.
5.3.4 Calibrate Gun Drop Time F31
It is recommended to calibrate the gun so that the welder understands the gun drop time and delivers the
precise main arc time programmed. The calibration is a good practice when you exchange the gun, especially
when you change process between short cycle mode (max. main arc time is 100 ms) and drawn arc (min. main
arc time is 100 ms), or change gun type or plunge dampener (shock absorber). Simply go to F31, and shoot a
stud. The actual gun speed is measured and the actual drop time is saved in F31.
When you display F31 on the front panel and make a weld, F31 should automatically update with the actual
drop time from the new weld. The newly updated F31 value should match with tD in F32. Another way is to
simply read tD in F32 from the previous weld and to adjust F31 to match. This equation should come within a
few milliseconds of the actual weld time: Front Panel Time - F31 setting before a weld = tM in F32 - tD in F32.
After calibration, tM in F32 should be fairly close to front panel time within a few milliseconds. If not, then
something in your gun, fastener, or else in the process is not exactly repeatable.
SPECIAL CASES
If the stud shorts out before the gun coil is de-energized, or, if the stud shorts after the weld current is switched
off, the drop time (tD) cannot be measured.
In each case, F31 does not update. F32 (tD) shows each of these cases in the text display. If the stud shorts
out before the gun coil is de-energized, adjust weld energy (lift, current, time) so that the stud does not short
during the weld. If the stud shorts out after the weld current is switched off, increase F2 to give the machine a
chance to measure drop time (tD).
Exit the F31 screen for production welding. Otherwise, F31 may continuously be changing after each
weld resulting in inconsistent settings in production.
If you accidentally recall a preset, F31 value can be changed to the value associated with the preset.
Check F31.
Summary of Contents for ArcCharger N550C DOMESTIC
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