Specifications

29
SPRING REPLACEMENT
Replacement springs must be of the same size and thickness as those removed. L-R Systems
recommends replacing all springs rather than just one.
Before replacing springs, disconnect the feeder from the power supply. Work on one spring assembly at a
time (first the rear spring stack). Make a note of the location and arrangement of each spring, spacer and
clamp. Remove the bolts which secure the leaf springs to the base, then the bolts which hold the springs to
the trough mounting bracket.
Install the new spring assembly in reverse order of that removed. Replace cap screws and torque as
specified on page 6.
AIR GAP
The air gap is the spacing that exists between the faces of the armature and core assemblies. Proper
adjustment of this space is extremely important for good feeder operation.
If the air gap is adjusted so the armature and core are too close, the faces of these items will make contact
during feeder operation. This is called “striking”.
CAUTION: If a loud striking noise occurs, immediately turn the unit off. When operating normally, the
feeder should perform with a smooth even stroke.
If the air gap is adjusted so the armature and core are too far apart, the feeder current may increase to a
dangerous level. A high current condition will result in coil burn-out, failure of control components or a
reduced material feed rate.
The air gap is properly set at the factory, re-adjustment should rarely be required. However, if high voltage
is applied to the feeder or if the air gap has been altered due to improper handling an adjustment may be
in order.
While following this procedure refer to the illustration on page 7.
Loosen hex nut (K) and insert a screwdriver into the slot on the end of the core (M). Turning the core
clockwise will narrow the air gap; counterclockwise will widen the air gap. The proper air gap is reached
when the air gap is as narrow as possible without a striking condition.
The designated current rating must not be exceeded.
When the proper air gap has been obtained, lock the core in place by tightening the hex nut (K).
F/DF-T01-A units operate with the trough stroke between .045” to .050” (1.1 to 1.3 mm). This is checked at
the stroke gauge on the trough assembly.
The air gap adjustment is a very delicate procedure and may require some time to properly obtain the
desired setting. The correct air gap spacing will be obtained when the armature and core faces are as
close as possible without “striking” when maximum current is applied to the feeder magnet.