Dresser Masoneilan SVI II AP Manuale di avvio rapido - Pagina 17

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Dresser Masoneilan SVI II AP Manuale di avvio rapido

M M a a s s o o n n e e i i l l a a n n D D r r e e s s s s e e r r

Wiring the

SVI II AP

Connecting to the Control Loop

Wiring Guidelines

In order for the SVI II AP to communicate the positioner data the SVI II

In order for the

SVI II AP to communicate the positioner data the SVI II

AP must be physically connected

AP must

be physically connected to a HAR

procedure below outlines wiring the SVI II AP.



Comply with current national and local regulations

for electrical installation work.



Comply with national and local explosive

atmosphere regulations.



Before carrying out any work on the device, power

Before carrying out any work

off the instrument or make sure that the locale

conditions for potentially explosive atmosphere

permit the safe opening of the cover.

permit the safe opening

MUST BE

The SVI positioner

It is important to maintain correct polarity at all times, otherwise the

positioner may not operate properly. . The SVI II AP should be physically

positioner may not operate properly

connected to the HART loop using a cable specified by the HART

connected to the HART loop using a cable specified by

Communication Foundation.

Communication F

oundation. A shielded

To connect the Control Loop to the SVI II AP:

1. 1.

Connect one end of the cable to

Connect one end of the cable to the control loop's

4 - 20mA output

2. 2.

Remove the threaded wiring covers on the

Remove the threaded wiring

3. 3.

Connect the other end of the cable to the SVI II AP. There

are two threaded openings on the positioner. Use the

are two threaded

opening with the red plastic insert.

4. 4.

Maintain polarity + and - respectively.

Maintain polarity + and

This list contains eight guidelines for a successful

This list contains eight guidelines for a successful implementat

current signal, DC power, and HART communication to the SVI

current signal, DC power, and HART communication to the SVI II AP:

1. 1.

Compliance voltage at the SVI II AP must be 9 volts at

Compliance voltage at the SVI II AP must be 9 volts at the

maximum current of 20 mA.

2. 2.

Signal to the SVI II AP must be a regulated current in

Signal to the SVI II AP must be a regulated current in the

range 3.2 to 22 mA.

3. 3.

Controller output circuit must be unaffected by the HART

tones which are in the frequency range between 1200 and

2200 Hz.

4. 4.

Frequency range of the HART tones must have a

Frequency range of the HART tones must have a circuit

impedance of more than 220 Ohms, typically 250 Ohms.

5. 5.

HART tones may be imposed by the positioner and a

communication device located anywhere on the signaling

circuit.

to a HART communication.

of the cover.

grounded according to local regulations.

The SVI II AP should be physically

A shielded cable is reco

cable is recommended.

covers on the positioner

openings on the positioner. Use the

- respectively.

S S V V I I I I I I A A P P Q Q u u i i c c k k S S t t a a r r t t G G u u i i d d e e

T communication. The

on the device, power

the HART

mmended.

the control loop's

positioner. .

implementation of DC

ion of DC

circuit

The

II AP:

the