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CAUTION: Excessive current draw is caused by too wide an air gap or too much spring tension,
resulting in heat build-up and blown fuses. Low current is caused by too narrow an air gap, resulting in
striking of the core and armature assemblies. Do not operate the vibrator while these conditions exist.
Refer to ”Vibrator Adjustment” below or contact SMH concerning spring adjustment.
MAINTENANCE
The vibrator and controller must be kept clean and all hardware must be kept tight.
Examine the leaf springs for defects. If defective, replace all springs. After replacing springs check the
current draw, an adjustment may be required. Refer to the vibrator adjustment instructions below.
VIBRATOR ADJUSTMENT
WARNING: The vibrator is adjusted while in operation. Use care to avoid electrical shock and
physical harm to personnel.
After installed and while operating, the current draw of the vibrator must not exceed the current ratings as
listed on page 3 of this manual. Check the current draw at the controller with a clamp-on amp meter. All
current must be taken at the controller.
To adjust the current draw of the vibrator, connect a clamp-on amp meter over ”L1” or ”L2” inside the
controller. While the vibrator is operating, loosen the lock nuts which are furthest from the coil spring (E).
Turn the hex nuts (closest to the coil springs) either up or down equally on each end of the vibrator until the
maximum efficiency is obtained, without exceeding the allowable amper rating.
IMPORTANT: When using a clamp-on meter to read the current of a vibrator the meter reading must
always be multipied by a factor of 1.7. Due to the waveform characeristics of the vibrator, the clamp-on
meter does not reveal the current rating as designated on the nameplate.
The vibrating action must be equal at the four corners of the vibrator. If there is a difference in the action of
the leaf springs at one end of the vibrator, tap the coil spring until it is centered and equal vibration is
obtained at each end of the vibrator.
When proper performance is obtained, lock the hex nuts in place. Remove clamp-on meter from the
controller and replace the controller cover. The vibrator is now ready for further operation.
LEAF SPRING REPLACEMENT
Defective or worn leaf springs must be replaced as they may cause a ”striking” condition. SMH
recommends replacing both leaf spring assemblies rather than only the defective springs.
To replace springs, work on only one end of the vibrator at a time. Remove hex nuts and cap screws which
secure springs to the vibrator. Remove springs, spacers, spring clamps and rubber transverse springs,
noting their position and arrangement. Insert new springs.After springs, spacers and clamps are installed,
replace the rubber transverse springs, replace hardware and tighten hex nuts to secure the spring
assembly. Follow this procedure on the opposite end of the vibrator.
After replacement of leaf springs, it is advisable to check the current rating. Refer to the vibrator adjustment
instructions in this manual.
