Samson S2000 Instrucciones de operaciones descargar pdf (Pagina 75)

9 Adjusting the limit switch

The positioner version with an inductive limit

switch has one adjustable tag (1) mounted

on the shaft which operates the proximity

switch (3).

For operation of the inductive limit switch,

the corresponding switching amplifier (see

section 5.2.1) must be connected to the out

put.

If the tag (1) is inside the field of the switch,

the switch assumes a high resistance. If the

tag is outside of the field, the switch assumes

a low resistance.

Normally, the limit switch is adjusted such

that it will provide a signal in both end posi

tions of the valve. The switch, however, can

also be adjusted to indicate intermediate

valve positions.

The desired switching function, i.e. whether

the output relay shall be picked up or re

leased when the tag has entered the field,

has to be determined, if necessary, at the

switching amplifier.

Setting the switching point:

NOTICE

During adjustment or testing, the switching

point must always be approached from

mid-position (50 %).

To ensure safe switching under any ambient

conditions, the switching point should be ad

justed to a value of approx. 5 % before the

mechanical stop (OPEN – CLOSED).

EB 8384-4 EN 75

Adjusting the limit switch

Fig. 26 · Adjustment of the limit switch

Adjustment screw (2) Tag (1) Proximity switch (3)

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Samson S2000 Instrucciones de operaciones Pagina 75