aldes VEX 790T Montaj ve Bakım Kılavuzu - Sayfa 17

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1. Electrical Connection

Electrical connection

Work on electrical installations must only be carried out by electri-

cians who are speciﬁ cally trained for this purpose.

First make sure that there is no voltage on the

CAUTION

connecting cable while you are working on the

electrical connections. Otherwise, a possible electric shock may re-

sult and the connected equipment may be damaged. The connecting

cable can be run to the pressure switch from three sides, according

to choice. The screw cable connection has a plug-in design for this

purpose. Rotate protective cover accordingly.

For cable gland models, the seal in the screw cable connection is

designed for cables with alternative sheath diameters of 0.275˝ (7

mm) or 0.393˝ (10 mm). Only use these sizes – otherwise the screw

cable connection cannot seal adequately.

1. If using a 0.275˝ (7 mm) connecting cable, you can line up

the press nut, the plain washer and the sealing ring directly

on the cable.

2. If using a 0.393˝ (10 mm) connecting cable, you must ﬁ rst

break the inner rubber ring out of the sealing ring directly on

the cable. Then line up the press nut, the plain washer and the

sealing ring on the cable.

Wiring

The switching device in this pressure switch is designed as a

change-over contact as can be seen from the wiring diagram (Figure

1). The rest position is shown in Figure 1 (pressure below the activa-

tion switch point on dial).

1. In the instance where pole 3 (COM) closes to Pole 2, the pres-

sure is increasing (NO).

2. In the instance where pole 3 (COM) closes to Pole 1, the pres-

sure is decreasing (NC).

Protect the feed line (to pole 3) by fuse, either in control system or

along the line, and do so with:

1. Max. 1.5 A / 250 VAC, if you are loading the contact with an

resistive load;

2. Max 0.4 A / 250 VAC, if you are loading the contact with an

inductive load (such as relay);

3. Max. 0.1 A / 24 VDC, if you are using the pressure switch in the

weak current version with gold-plated contacts.

The connections are intended for crimp-type sockets, 0.25 in (6.3 mm).

1. Make sure the crimp connection is perfect, and that the cable

lugs ﬁ t properly on to the connections.

2. If you do not have any crimp-type sockets available, you can

also use the cable lugs which are supplied with mounted screw

terminals. However, these are only intended for rigid copper

wire.

3. On ﬂ ex, it is either necessary to crimp on strand end sleeves –

and then you can also screw the strands on – or to crimp cable

lugs on directly as previously described.

Setting the pressure Range

Make absolutely certain that there is no voltage on the electrical con-

nections before you carry out any setting on the pressure switch.

Otherwise, it could be fatal if you accidentally touch the electrical

connections or the metal adjusting screw while you are performing

the settings.

a) Use the adjustment dial to set the pressure which should trip the

switch on an increase of pressure.

1. The indications on the dial are only correct for the vertical

mounting position.

2. When the pressure falls, the switch returns to its resting posi-

tion as soon as the pressure falls below the dead band.

Attaching cover

a) Insert the screw cable connection into the recess provided for this

purpose on the housing.

b) Then place the housing cover in position and screw it down evenly

on to the pressure switch.

Testing the Setting

Do not operate the system until the housing is closed. Otherwise

there is the possibility of an electric shock if you accidentally touch

live parts.

Check the trip and reset pressures by slowly increasing the pressure

and then allowing it to fall again.

IMPORTANT: Observe the maximum permissible operating pressure

of 40˝ w.c. (10 kPa) which is indicated in the data sheet. Otherwise

the pressure switch may be damaged.

MAINTENANCE

Upon ﬁ nal installation of the Series ADPS Adjustable Differential Pres-

sure Switch, no routine maintenance is required. A periodic check

of system operation is recommended. The Series ADPS is not ﬁ eld

serviceable and should be returned if repair is needed (ﬁ eld repair

should not be attempted and may void warranty). Be sure to include

a brief description of the problem plus any relevant application notes.

Contact customer service to receive a return goods authorization

number before shipping.

2 NO

3 COM

1 NC

1. Break Contact

2. Operating Contact

3. Power Supply Line

Figure 1