Emerson 3051S Specifikace stáhnout pdf (Strana 31)

Reference Manual

00809-0100-4801, Rev FA

October 2010

2-17

Rosemount 3051S Series

Signal Wiring Grounding

Do not run signal wiring in conduit or open trays with power wiring, or near

heavy electrical equipment. Grounding terminations are provided on the

sensor module and inside the Terminal Compartment. These grounds are

used when transient protect terminal blocks are installed or to fulfill local

regulations. See Step 2 below for more information on how the cable shield

should be grounded.

1. Remove the Field Terminals housing cover.

2. Connect the wiring pair and ground as indicated in Figure 2-9.

a. The terminals are not polarity sensitive.

b. The cable shield should:

• Be trimmed close and insulated from touching the transmitter

housing.

• Continuously connect to the termination point.

• Be connected to a good earth ground at the power supply end.

Figure 2-9. Wiring

3. Replace the housing cover. It is recommended that the cover be

tightened until there is no gap between the cover and the housing.

4. Plug and seal unused conduit connections.

Power Supply 4–20 mA Transmitters

The dc power supply should provide power with less than two percent ripple.

Total resistance load is the sum of resistance from signal leads and the load

resistance of the controller, indicator, and related pieces. Note that the

resistance of intrinsic safety barriers, if used, must be included.

See “Load Limitations” on page A-7.

NOTE

A minimum loop resistance of 250 ohms is required to communicate with a

Field Communicator. If a single power supply is used to power more than one

3051S transmitter, the power supply used, and circuitry common to the

transmitters, should not have more than 20 ohms of impedance at 1200 Hz.

Trim shield and

insulate

Insulate

Shield

Connect Shield Back to the

Power Supply Ground

Ground for

Transient

Protection

Minimize

Distance

Minimize

Distance

1 2 ... 26 27 28 29 30 31 32 33 34 35 36 ... 239 240

Komentáře k této Příručce

Žádné komentáře

Emerson 3051S Specifikace Strana 31

Komentáře k této Příručce

Související produkty a manuály pro Měření, testování a kontrola Emerson 3051S