10
8. Options
(1)Counter LS Unit
The Tsubaki counter LS unit for LINIPOWER JACK works like the eyes and ears of the jack. It is a small-sized
stroke adjustment and detection unit that contains a feed cam mechanism and microswitches. The counter LS
unit has two internal microswitches. The unit runs the jack stroke through the gear mechanism, where the
strikers and microswitches detect and adjust the stroke. The display number of the counter LS unit changes by
one with each rotation of the input shaft.
■
General Precautions
1. Newly delivered counter LS units have already been tested, but have not been adjusted for stroke.
Therefore, you must carry out stroke adjustment after the unit is installed. Be sure to take into
consideration the inertia of the jack when performing the stroke adjustment. If the travel screw is turned
while the input shaft fixed after adjustment, the adjusted settings will change. Therefore, do not allow the
travel screw to be turned (for traveling nut-types, do not allow the nut to be turned).
2. The counter LS unit contains precision parts and should not be subjected to severe shock or vibration.
■Connection
1. Note: As the wiring length increases, the signal power decreases.
2. Properly ground the main unit and the shielded wiring for the signal wires.
3. Always have the signal conductor and power wires away from each other. A noise filter should be installed
on any nearby devices that generate a lot of noise, signal wires should be shielded. Other necessary
countermeasures to prevent adverse effects should be performed.
4. Use a cable of the same gauge (dia.) as the connector of the counter LS unit. Using a cable that is too
thin or inserting discreet wires will render the waterproof feature of the unit ineffective.
5. If wiring is performed in an area where the counter LS unit may get wet from rain or other sources, make
sure that no water gets inside the unit causing it to malfunction.
■
Setting the counter LS unit
1. Temporarily set (at "0" reset) the forward and reverse counter LS units for a short stroke near the stroke
center of the jack. Make sure that the units can move properly.
2. Set the jack at the position where you want it to stop by manual operation, or by inching (the forward limit).
(Check to see which direction the numbers on the display of the counter LS unit are moving. Refer to Figs.
4 through 7.).
3. Push the reset button of the counter LS unit. The display number changes to "00000" and the striker sets.
When the display numbers of the counter LS unit are changing from "00000" to "99999", or vice versa, the
striker activates a microswitch.
4. Do the same for the reverse direction (i.e., after setting the limit for the forward direction, set the limit for
the reverse direction). (Be sure not to allow the screw axis to rotate changing the settings that have been
made. For traveling nut-types, do not allow the nut to rotate)
5. The terminal block sets the contacts for each microswitch. Therefore, take into account the forward limit
and reverse limit when wiring.
Microswitch specifications in Counter LS Unit
Part Number
AVT3254 (Panasonic) or equivalent
Rating
AC250V 3A
（
cosφ=0.4
）
Contacts
1 C
※
In case of the special specification, confirm the final drawing because model number or specification might
be different.
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