SETTING THE LIMIT SWITCHES
1. Remove the cover on the electrical enclosure. There are
two limit nuts on the threaded limit shaft that move
laterally along the shaft as the operator opens and
closes the door. When a limit nut nears the end of the
shaft it activates a (set of) switch(es). Auxiliary switches
may also be present, they are used to control other
functions. These are mounted on a separate bracket
and should not be confused with the the OPEN and
CLOSE Limit Switches which are mounted on a bracket
secured to the base of the electrical enclosure box and
are somewhat hidden from view.
2. Manually set the door to a nearly closed position.
3.
Refer to Figure 13. Depress the limit nut retaining
TO AVOID RISK OF ENTRAPMENT AND POSSIBLE
DAMAGE TO THE DOOR AND OPERATOR THE LIMITS
MUST BE ADJUSTED BEFORE APPLYING POWER TO
THE OPERATOR.
WARNING
bracket away from the slots in the limit nuts. Turn the
CLOSE limit nut on the shaft until it engages the CLOSE
Limit Switch. The switch will sound an audible “click”
when engaged. If there are auxiliary present, the limit
switch will be the second “click”. Release the retaining
bracket and be sure that it engages in slots of both limit
nuts.
4. Manually raise the door to a nearly OPEN position and
repeat Step #3 with the OPEN limit nut and switch.
5. If auxiliary switches are present, the limit nut will actuate
them just prior to activating the open or close limit
switch. (This is preset at the factory.)
6. Manually move the door to a half open position to avoid
door damage due to incorrect power supply phasing.
On three phase units the door may initially run in the
wrong direction when power is first applied. With the
door in a mid position there will be time to stop the door
before damage can happen if incorrect phasing occurs.
7. A final limit adjustment will be necessary after the
connection of the power supply in order to ensure the
door stops at the proper Open and Close positions.
14
INSTALLATION INSTRUCTIONS
OPEN
LIMIT NUT
CLOSE
LIMIT NUT
OPEN LIMIT
SWITCH
CLOSE
LIMIT SWITCH
LIMIT NUT
RETAINER PLATE
LIMIT SHAFT
CONTROL BOX
FIGURE 13
Summary of Contents for SL Series
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