Daktronics DBH-150 - Manual (Page 12)

8
Initial Lower Limit Adjustment
To initially adjust the lower limits, start by lowering the hoist
to the desired low limit height. Adjust the lower normal cam
wheel by turning the yellow set screw associated with the lower
normal limit switch (Figure 7) counterclockwise until it contacts
the back side of the roller lever on the switch, and actuates the
switch. Operate the hoist up and down into the limit to test.
Re-adjust the switch as necessary by rotating the yellow set screw
counterclockwise to raise the limit or clockwise to lower the limit.
Turning the adjustment screw ¼ turn will change the limit by
approximately 9" (230mm).
Continue by setting the lower over-travel limit. Operate the hoist
until it actuates the lower normal limit and stops. Adjust the
lower over-travel cam wheel by rotating the yellow set screw
counterclockwise until it actuates the lower over-travel switch.
With the hoist power on and the hoist enabled from the remote
control, the main contactor (LC1) will de-energize. Once the
switch is actuated turn the yellow set screw ¼ turn clockwise.
The switch will deactivate and the main contactor will energize.
This will give approximately 6" (150mm) of over-travel distance
beyond the normal lower limit.
Initial Upper Limit Adjustment
To initially adjust the upper limits, start by raising the hoist to the
desired high limit height. Adjust the upper normal cam wheel by
turning the yellow set screw associated with the upper normal
limit switch (Figure 7) clockwise until it contacts the front side of
the roller lever on the switch, and actuates the switch. Operate
the hoist up and down into the limit to test. Re-adjust the switch
as necessary by rotating the yellow set screw counterclockwise
to raise the limit or clockwise to lower the limit. Turning the
adjustment screw ¼ turn will change the limit by approximately
9" (230mm). Figure 8 illustrates the labels corresponding to
each screw.
Continue by setting the upper over-travel limit. Operate the hoist
until it actuates the upper normal limit and stops. Adjust the
upper over-travel cam wheel by rotating the yellow set screw
clockwise until it actuates the lower over-travel switch. With the
hoist power on and the hoist enabled from the remote control,
the main contactor (LC1) will de-energize. Once the switch is
actuated, turn the yellow set screw ¼ turn counterclockwise. The
switch should deactivate and the main contactor will energize.
This will give approximately 6" (150mm) of over-travel distance
beyond the normal upper limit.
Once the limit switches are set, under normal operating
conditions they should not have to be reset. If the hoist is moved,
or the high or low limits do need to be reset for any reason, do
so by using the procedures above. When readjusting the limits,
make certain to reset the over-travel limits as well.
LIMIT SwITCH INfORMATION TABLE
Limit Switch
Model
Set Screw
Turn Degree
Limit Change
Distance (")
Limit Change
Distance (mm)
FRS-100 90 9 in. 228.6 mm
The upper cams will activate the
switches from the near side and the
lower cams will activate the switches
from the far side as shown.
Lower Overtravel
Limit Switch Lower Normal
Limit Switch Upper Normal
Limit Switch Upper Overtravel
Limit Switch
Figure 7: Adjustment Screw location
Figure 8: Rotary Limit Switch Wire labels