SWK
SWK K06/0618 page 7
9. Operation / Configuration / Adjustments
The commissioning of these units is prohibited in machines (as long as the
guidelines 89/392/EWG remain enforced), which do not comply with these
guidelines.
The unit is supplied in 'ready for operation' condition. The switching point is
adjusted on the lowest scale value.
9.1 Adjustment of Limit-Value (SWK-1...)
Loosen the knurled nut on the reed contact.
Adjust the marking on the contact for the desired value on the scale. In once
positioned the knurled nut should be tightly screwed.
9.2 Adjustment of Limit-Value (SWK-2...)
Loosen the knurled nut on the reed contact.
Connect a suitable continuity-tester on cable ends.
Case 1: On an installed unit
Open the supply line, and let the flow-medium enter slowly, till the pointer
display shows the desired flow value- at which the rising flow should operate
the switch (the value for the decreasing flow lies below due to the hysteresis).
Case 2: On an uninstalled unit the adjustment may be performed by lifting
the float with a suitable tool.
Switch-housing is repositioned from top to bottom, till the reed contact just
closes (electrical continuity). In this position, secure the contact by tightening
the knurled nut.
The unit is now adjusted and ready for operation.
On correct adjustment, the limit-value contact performs bistable action. That
means, even after on crossing above the adjusted limit-values, the contact
remains closed.
Hysteresis
Hysteresis is an indication of difference between switch-on (rising float) and
switch-off (falling float) points of a contact. The average hysteresis corresponds
to a float-centre movement of about 3 mm.