N1500i FACS Manual
22
Part No. 729-110-053 V.1.03
© 2018 Nelson Stud Welding, Inc. All rights reserved.
3.3.4 Calibrate the 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
(maximum main arc time is 100 ms) and drawn arc (minimum main arc
time is 100 ms), or change gun type or plunge dampener (shock
absorber). Simply go to F31, and then weld a stud. During this weld,
the actual gun speed is measured, and the actual drop time is then
displayed 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
t
D
in F32. Another way is
simply read
t
D
in F32 from the previous weld and adjust F31 to match
it. Generally speaking, this equation should hold within a few
milliseconds: Front Panel Time - F31 setting before a weld =
t
M
in F32
-
t
D
in F32.
After calibration,
t
M
in F32 should be fairly close to front panel time
(within a few milliseconds). If not, then something in your gun, fastener,
or elsewhere in the process is not exactly repeatable.
Special cases:
If the arc shorts out before the gun coil is de-energized, or, if the stud
shorts after the weld current is shut off, the drop time (
t
D
) can't be
measured.
In each case, F31 does not update. F32 (
t
D
) shows each of these cases
in text. If the arc 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 arc shorts out after the weld current is shut off, increase
F2 to give the machine a chance to measure drop time (tD).
Exit the F31 screen for production welding. Otherwise, F31 may be
continuously changing after each weld resulting in inconsistent set-
tings in production.
If you accidentally recall a preset, F31 value can be changed to the
value associated with the preset. Check F31.
3.3.5 Weld Parameter Presets
The power source has ten available preset configurations. Each of these
is assigned a time and current setting for commonly welded stud sizes.
To select a preset, simply press key 1, 2, 3, 4, 5, 6, 7, 8, 9, 0. When a
Note!
