De Gier B.V., Westlandseweg 9, 2291 PG WATERINGEN, THE NETHERLANDS, Tel. +31 (0)174 292089, Fax +31 (0)174 295644, E-mail: [email protected]
www.degier.eu
Version 1 – 2014 / 06 / 11
12
INSTALLATION MANUAL
4.5 Adjusting the limit switches
Use the following procedure and the figures on page 13 to adjust the built-in limit switches.
Operation
• The switch shaft (A) of the limit switch mechanism is driven by a toothed belt from the output shaft of the motor
gearbox.
• On the switch shaft (A) there are two switch nuts (E) consisting of a knurled nut (D) and an adjustment ring
(C). The adjustment ring can be secured to the knurled nut (D) by a short set screw (G) and a long set screw
(H).
• The switch nuts (E) move along the switch shaft (A) in direction I or II, depending on the direction of rotation of
the motor gearbox. When the switch nut reaches the stop nut (B) at the end of the switch shaft and is not able
to travel any further, the switch nut (E) will start to turn with the switch shaft (A).
• The limit switch has two spring arms (F), each of which actuates a working switch and an emergency switch:
either working switch S11 and emergency switch S21 for rotation direction I, or working switch S12 and
emergency switch S22 for rotation direction II.
• The emergency switch (S21 or S22) is a safety device and is only actuated if the working switch (S11 or S12)
does not stop the motor gearbox on time.
• The long set screw (H) of each switch nut (E) is located between the spring arms. If one of the switch nuts
reaches its stop nut, the switch nut rotates with the shaft and the long set screw actuates the working and
emergency limit switches corresponding to direction of travel via the spring arm (F).
Mounting the limit switch (standard factory-fitted)
1. Remove the black plastic protective cover from the motor gearbox;
2. Fit the complete limit switch in its intended position;
3. Ensure that both long set screws (H) are located between the spring arms (F) so the spring arms release their
limit and emergency switches when the switch nut starts to turn with the shaft;
4. Secure the limit switch above the switch shaft (A) by screwing the two Phillips screws hand-tight.
Adjustment procedure
1. Remove the black plastic protective cover to reveal the limit switch mechanism and the toothed belt;
2. Check whether the adjustment rings (C) are free to move on the knurled nuts (D) by manually moving the
knurled nuts along the switch shaft (A). If they do not move freely, loosen the set screws by one turn (do not
remove);
3. Use a hex key to rotate the motor gearbox from the rear of the motor and determine which working switch
(S11 or S12) marks the start and end points in your application;
4. Using a hex bit, move the motor gearbox to the start point (see the diagram below);
Caution!
When driving the electric motor with a hex bit, keep the speed below 250 rpm to avoid damage to the hex
socket at the rear of the motor shaft.
5. Hand-tighten the associated knurled nut (D) against its stop nut (B);
6. Fit the included hex key (X) in the long set screw (H) and turn the adjusting ring (C) over the knurled nut (D)
until the spring arm moves away from the plastic case and you hear a soft click. Then tighten the long set
screw on the knurled nut to 2 Nm;
7. Tighten the short set screw (G) of the switch nut (E) that has just been adjusted to 2 Nm;
8. Using a hex bit, move the motor gearbox to the other end point;
9. Repeat steps 5 through 7 to adjust the other working switch;
10. Replace the black plastic protective cover on the motor gearbox and tighten the four screws again;
11. Keep this manual with adjustment instructions in a suitable place.
Tip
To avoid mistakes in the future, mark the switches to indicate which one limits the start position and which
one limits the end position.
Adjusting the limit switches
