PEBCO®
DUSTLESS LOADING/SELF-CONTAINED DUSTLESS LOADING SPOUTS
MAINTENANCE RECOMMENDATIONS
19
6.6.5 Lifting Cables
Lifting cable transfer sheaves located under housing assembly have non-lubricated bearings.
These bearings should remain dry and are not to be lubricated.
6.7 ROTARY LIMIT SWITCH ADJUSTMENT
Rotary limit switches are preset at the factory; however, they can become misaligned during shipping
or after long periods of operation and should be checked during installation and periodically
thereafter.
1. Remove the cover on the rotary limit switch, so that the limit switch cams can be observed.
2. With a person observing the limit switch cams, jog the motor to raise the DLS.
3. Raise the unit until the published retract height for the unit is reached. Refer to the customer
certified drawing accompanying this manual.
4. At this point, one of the limit switch cams should have actuated one of the micro switches or be
just ready to actuate:
a. If a micro switch has been actuated, this action should have stopped the drive motor.
If
not, recheck the limit switch circuitry to determine if it is properly wired to the
motor starter
.
b. If a micro switch has
not
been actuated but is just about to, continue the operation of the
drive unit until the sequence described in (a) occurs. If this causes the retracted height
of the DLS to be different then specified on the certified drawing, this condition is
acceptable if the difference in height is no more than plus or minus 1-1/2 inches.
c. If at the retracted position a limit switch cam is not near the activation point - the
particular limit point must be reset. See instructions inside cover of switch enclosures.
5. Lower the DLS assembly to its full extended length listed on the customer certified drawing
accompanying this manual.
6. At this point, observe and confirm the following:
a. The outlet assembly is suspended in a level position. (If not, adjust the lifting eyebolts on
the outlet assembly).
b. The dust sleeve is suspended uniformly with no twists in the fabric. (Also check for
hidden tears.)
c. The
other
rotary limit switch either stopped the drive motor at this position or the
observed cam is just ready to actuate.
7. It is important that the rotary limit switch stop the DLS in the lower position
just before the lift
cables become slack
. This condition is preset at the factory, but may have shifted during transit
or operation.
