Wika WUD-26 Uživatelský manuál stáhnout pdf (Strana 18)

Operating instructions/Betriebsanleitung, WUD-2x

11611057.01 GB/D 11/2013

Switch function

Hysteresis function

If the system pressure uctuates around the set point, the hysteresis keeps

the switching status of the outputs stable. With increasing system pressure,

the output switches when reaching the switch point (SP).

■

Contact normally open (NO): active

■

Contact normally closed (NC): inactive

With system pressure falling again, the output will not switch back before the

reset point (RP) is reached.

■

Contact normally open (NO): inactive

■

Contact normally closed (NC): active

Delay times (0 ... 50 s)

This makes it possible to lter out unwanted system pressure peaks of a short

duration or a high frequency (damping). The system pressure must be present

for at least a certain pre-set time for the output to switch on. The output does

not immediately change its status when it reaches the switching event (SP),

but rather only after the pre-set delay time (DS).

If the switching event is no longer present after the delay time, the switch

output does not change. The output only switches back when the system

pressure has fallen down to the reset point (PR) and stays at or below the

reset point (RP) for at least the pre-set delay time (DR).

If the switching event is no longer present after the delay time, the

switch output does not change.

7. Initial start-up and operation GB

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Wika WUD-26 Uživatelský manuál Strana 18