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Maintenance
Daily checks:
The function of the two-hand control system should be checked daily. Check that the safety relay is de-energized
and the machine is stopped when one or more of the JSTD1 pushbuttons are released. Check that the covers over
the JSTD1 switches are OK and that the pushbuttons have a distinct operating function.
Warning!
The safety functions and the mechanics shall be tested regularly, at least once every year to confirm that all the
safety functions are working properly (EN 62061:2005).
In case of breakdown or damage to the product, contact the nearest ABB Jokab Safety Service Office or reseller.
Do not try to repair the product yourself since it may accidentally cause permanent damage to the product,
impairing the safety of the device which in turn could lead to serious injury to personnel.
Testing of the safety functions
Make sure the safety unit is working properly by following these steps:
1 ) Start the machine by pushing all the JSTD1 pushbuttons – the
safety relay should be activated and the machine started.
2 ) Release all pushbuttons – the safety relay should de-energize
and the machine stop.
3 ) Start the machine by pushing all the JSTD1 pushbuttons – the
safety relay should be activated and the machine started.
4 ) Release one of the JSTD1 pushbuttons – the safety relay should
de-energize and the machine stop.
5 ) Activate the pushbutton again – the safety relay should not re-
energize and the machine should not start.
6 ) Release all pushbuttons.
Repeat sequence 3-6 for the three other JSTD1 pushbuttons.
7 ) Activate each JSTD1 pushbutton in turn (in all possible
combinations, see table to the right), the safety relay should not
energize and the machine should not start.
Check of simultaneousness:
Check the simultaneousness of the system by operating one of the JSTD1 pushbuttons for more than 0.5 seconds
before pressing the three other JSTD1 pushbuttons. The machine should not be started. These checks should be
repeated at least every year and after changes or maintenance on the machine. The stopping time should also be
measured at least once each year.
2TLC172182M0201, rev. F
2015-12-04
Button
Possible pushbutton combinations
10
1
2
3
4
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
www.abb.com/jokabsafety
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