Nec Limit Switch With Illustration - Chamberlain GAROG DK Series Operating Manual

NEC LIMIT SWITCH WITH ILLUSTRATION

Limit switch setting:
The limit switch is delivered in a non-adjusted state. It has two all-purpose cams which each consist of an operating
limit switch and a safety limit switch (black and yellow cams) and potential-free contacts (grey, white and blue
cams). The design of the new cams significantly simplifies the setting of the end positions, since both the end
position as well as the respective safety limit switch can be set in one movement.
Two freely-adjustable changeover contacts
(grey and blue cams) are fitted to plug-in terminals.
A third switch is set as a pre-limit switch (white cam).
Operating
limit switch -
Safety limit
fine setting
switch - fine
Coarse
setting
setting
"UP"
"DOWN"
limit switch,
limit switch,
black
yellow
Switching nose for
safety limit switch
Switching nose for
operating limit switch.
The limit switch configuration is explained in the illustration above. Move the door in "dead-man" state to the
end position to be set and place the adjusting screwdriver into the stud screw for coarse setting as shown in
the right-hand picture. Set the all-purpose cams for the corresponding end positions (BLACK for UP and
YELLOW for DOWN) so that the microswitch is almost actuated.
Note: Take note of the approach direction of the cam to the microswitch. Tighten the screw thus
safeguarding the cam from turning.
Now turn the fine setting screw on the operating limit switch until the limit switch is actuated. Check the end
position in travel operation. For re-adjustment purposes the door should always be travelled about 0.5 m
away from the respective end position.
In the normal situation it is not necessary to separately set the safety limit switch since delayed switching of
the safety limit switch is guaranteed due to the special shape of the actuating noses on the all-purpose
cams. This means it is unimportant from which side the microswitch is actuated. However in the normal
case the safety limit switch should be actuated about 10 cm after the normal end position has been
reached. It is possible to alter this switching point at any time by means of the "Safety limit switch - fine
setting" (see picture at top right).
Repeat the procedure for the other end position. If the safety limit switch is actuated an error is displayed
optically in the case of GAROG processor controllers. Don't forget that after finishing the setting work the
coarse setting screws must be tightened up so that the limit switch cannot move during door operation. The
cams in the supplementary contacts, which can be overrun, can only be adjusted with the coarse setting
screw.
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