NS20A & NS20N Heavy Duty Gun
Page 3
Revision 1.20 2/19/08
LIFT AND LIFT ADJUSTMENT
Lift Adjustment
The gun lift can be checked without welding a stud.
The recommended procedure for checking the lift
is under a simulated welding condition as described
below for:
Nelweld Power Sources
Series 6000 (TR-2400)
Series 5000 (TR-1600)
Series 4800
Series 3000 (NS-20A HD)
Figure 3: Rear view of gun
Nelweld Power Sources
1. Load stud and ferrule into gun with proper
plunge setting for welding.
2. Trigger the gun in the air away from the work
surface and continue pressing the gun trigger.
After the gun lifts and plunges, place the gun in
normal welding position on a piece of wood or
other insulated type surface or on the work
surface and continue holding the gun trigger.
After a short delay (the default setting is two
seconds – refer to the Nelweld Manual for
instructions on how to change this time, if
desired), the gun will lift a second time without
an arc being established. The gun will stay
lifted for a short time (the default setting is two
seconds – refer to the Nelweld Manual for
instructions on how to change this time, if
desired).
3. Measure the inward movement of the shaft
extension. This is the actual lift that will occur
under the welding condition.
Note:
Triggering the gun in the air away from the
work surface will cause the gun to lift. The lift in
open air will be greater than when the gun is in the
actual or simulated weld condition.
To Change Lift:
Remove rear cap on gun, loosen lock screw and
position the adjustable core as required (
Figure 3
).
To Increase Lift
, screw out (counter-clockwise)
the adjustable core.
To Decrease Lift
, screw in (clockwise) the
adjustable core.
After proper lift is obtained, lock adjustable core in
position by tightening lock screw. Replace rear cap
on gun.
Recommended Lift Settings for Steel Studs
When welding:
½” diameter studs or less.................................1/16”
⅝” and ¾” diameter studs ...............................3/32”
⅞” diameter studs and over .................7/64” to 1/8”
Core screw
Back of gun
Locking
screw