![background image](http://html1.mh-extra.com/html/airmatic/mvss/mvss_operators-manual_2878470014.webp)
12
Eccentric Weight Adjustment Cont.
Check shaft rotation before replacing weight covers. Start vibrator for 1 second, stop and
lockout/tag out. Observe direction of rotation. If desired to reverse the direction of rotation,
switch two of the three power supply leads in the wiring box or at the motor starter for 3-phase
electric vibrators. For 1-phase electric vibrators, refer to the wiring diagram for changing the
direction of shaft rotation.
Replace weight covers using screws and washers being careful not to pinch the O-rings. The
screw torque is outlined in the Appendix. Never operate the electric vibrator without weight
covers in place. They provide a degree of protection for the bearings and a shield for the rotating
eccentric weights. Always replace broken weight covers immediately. Do not operate electric
vibrator with weight covers removed or with damaged weight covers.
Starting Up
After making sure that the power supply voltage matches the voltage marked on the nameplate,
that the mounting bolts are properly secured, that all covers are in place and secured, and that
the motor starter is properly installed and adjusted, turn the electric vibrator on. Excessive
noise would indicate a problem but slight bearing noise is normal due to the type of bearing
used. After a few hours of operation, check each line current and verify that it does not exceed
nameplate current. If the line current exceeds the nameplate current, then the mount needs to
stiffened, the vibrator weights need to be reduced or the vibrator needs to be moved to a more
rigid location. Never operate the vibrator above nameplate current.
After the first 8 hours of operation, check the line current to make sure that it does not exceed
nameplate and check mounting bolt torque. See MOUNTING HARDWARE AND TORQUE.