9
1/4
–nch long upper magnet adjusting screw only).). Make sure that the threads on the adjusting screws
have been cleaned and Locktite #242 has been applied to the threads.
NOTE: Once the magnet assembly has been replaced the air gap will need readjusted. Feeler gauges
are used to measure thickness or distance between the magnet and armature. This thickness or distance
is referred to as the ”air gap”.
When the drive is not energized (power is off), the static air gap can be measured with a feeler gauge.
Set the air gap at 0.185 inches (4.7mm) and snug down the magnet locking screws and the magnet
adjusting screws (it is important that the air gap is parrallel side to side and top to bottom). Replace the
side gasket and securely reattach the side plate. Refer to the Air Gap Instructions below to make the
final adjustments.
AIR GAP ADJUSTMENT
The air gap is the space between the faces of the armature and the magnet assembly. Proper air gap
adjustment is critical to good feeder performance.
The air gap is properly set at the factory (when a feeder with trough is supplied). Re-adjustment should
rarely be required. However, if high voltage is applied to the feeder, or if the air gap has been moved out
of adjustment, an adjustment of the air gap will be necessary.
Adjusting the air gap is a very delicate procedure, and may require operation time to obtain the proper
setting. The air gap is correct when the armature and magnet faces are as close as possible without
striking when maximum current is applied to the feeder.
WARNING: If the unit makes a loud striking noise while operating, immediately shut off power to
the unit.
If the air gap is adjusted so that the armature and magnet are too close, they will make contact during
feeder operation. This is called striking. A striking condition will cause severe mechanical damage
(broken springs, cracked trough or base, cracked armature or magnet assembly).
If the air gap is adjusted so that the armature and magnet are too far apart, the current draw will be
excessive. A high-current condition will result in coil burn-out, failure of control components, or reduced
material feed.
WARNING: Never open the air gap more than necessary. An excessive air gap draws more
current which will result in poor feeder performance and possibly damage the unit.
To adjust the air gap, the feeder must be empty of all material with the trough and all side plates installed.
Refer to the following instructions to adjust the air gap, and to identify the adjustment screws used to
adjust the air gap. Remove these adjustment screws, clean the threads, and reinstall them with Locktite
#242 applied to the threads.
AIR GAP ADJUSTMENT
(cont’d)
To open the air gap:
