Flowserve MX-100 Field Unit Manual de usuario descargar pdf (Pagina 37)

MX/DDC-100 Field Unit Installation and Maintenance FCD LMENIM2329-01 – 03/11

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Figure 3.9 – Daisy chain topology

Legend

MOV

N/C

Data terminal is positive with respect to data* terminal

Data 1

RS-485

PORT 1

Network port A

A1*

MOV-1

See Note 5

N/C

A2*

N/C

MOV-249

See Note 5

N/C

MOV-3

See Note 5

N/C

Ground 3

Data* 2

A1*

A2*

A1*

A2*

- Motor-operated valve

- Data A1

- Data A1*

- Data A2

- Data A2*

- Shield

- No connection

N/C

Earth ground

(See Note 4)

N/C

MOV-2

See Note 5

A1*

A2*

MOV-248

See Note 5

A1*

A2*

MOV-250

See Note 5

A1*

A2*

Host

(Network controller)

Notes:

1. Belden 3074F, 3105A, or 9841 shielded cable is recommended.

2. Correct polarity for ﬁeld unit and network controller connection is

necessary for proper operation.

3. Connections shown are typical. The number of MOVs shown may not

indicate true system size.

4. Earth ground: ground rod

5. Earth ground: ground rod or lug in actuator if actuator is grounded.

Diagnostic note:

Polarity and level of the network’s data connection can be checked by

measuring voltage between data and data* terminals. This voltage should

be greater than +200 mV DC with network controller (host) network ports

disconnected. Data terminal is positive with respect to data* terminal.

Earth ground note:

If low impedance earth ground is not available at each actuator, contact

engineering for alternative earth ground surge protection strategies.

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Flowserve MX-100 Field Unit Manual de usuario Pagina 37

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