10/12
Fig.8
5.
OVERLOAD DETECTION
Using the limit switch, overload can be detected easily.
If the Shock Guard trips due to overload, the cam follower will disengage from the pocket
and the camshaft and main unit
（
case
）
will idle. At the same time, the LS detecting plate
slides in the axial direction.
The limit switch detects this movement, shuts the power off and sets off an alarm. Whether
the stopping side is on the camshaft side or the main unit case side,
overload can be
detected. For every one trip, the LS detecting plate slides three times.
①
Table 7 shows LS detecting plate movement and
force during trip. Choose a limit switch from chart
5 that meets
the “movement until operation” and
its “necessary
amount of force”.
②
Fig.9 are limit switch installation examples.
③
Connect the limit switch’s “b contact” parallel to
the start button’s contact.
④
Fig.10 shows an example of a typical circuit.
TSUBAKIMOTO CHAIN
recommends using
a built-in holding circuit.
Model No.
Amount of
movement
(mm)
Force when
moving
N{gf}
TGM3
TGM6
TGM20
4
3.9{400}
TGM60
6
3.9{400}
TGM200
6
5.4{550}
TGM400
TGM800
8
5.9{600}
Table 7
