Flowserve 3200MD User Manual download pdf (Page 12)

User Instructions - Digital Positioner 3200MD LGENIM0059-09 12/13

6 Wiring and Grounding

Guidelines

(See Figure 6)



WARNING: This product has electrical conduit connec-

tions in either thread sizes ½ " NPT or M20 which appear

identical but are not interchangeable. Housings with

M20 threads are stamped with the letters M20 above

the conduit opening. Forcing dissimilar threads together

will damage equipment, cause personal injury and void

hazardous location certiﬁ cations. Conduit ﬁ ttings must

match equipment housing threads before installation. If

threads do not match, obtain suitable adapters or contact

a Flowserve representative.

6.1 4-20 mA Command Input Wiring

Verify polarity when making ﬁ eld termination connection. The Logix

3200 is reverse polarity protected. Wire 4-20 mA current source to

the input terminal labeled 4-20 mA Input on the user interface board

(See Figure 6). Never connect a voltage source directly across the

Logix 3200MD terminals. The current must always be limited for

4-20 mA operation. Minimum operating current is 3.6 mA.

The input loop current signal to the Logix 3200MD digital positioner

should be in shielded cable. Shields must be tied to a ground at only

one end of the cable to provide a place for environmental electrical

noise to be removed from the cable. In general, shield wire should

be connected at the source.

! NOTE: The Logix 3200MD positioner carries an intrinsically safe

barrier rating of 100 mA. Input currents should not exceed 100

mA.

6.2 Grounding Screw

The green grounding screw, located inside the termination cap,

should be used to provide the unit with an adequate and reliable

earth ground reference. This ground should be tied to the same

ground as the electrical conduit. Additionally, the electrical conduit

should be earth grounded at both ends of its run.



WARNING: The green grounding screw must not be used

to terminate signal shield wires.

6.3 Compliance Voltage

(See Figure 7)

Output compliance voltage refers to the voltage limit that can be

provided by the current source. A current loop system consists of

the current source, wiring resistance, barrier resistance (if present),

and the Logix 3200MD positioner impedance. The Logix 3200MD

digital positioner requires that the current loop system allows for

a 10.0 VDC drop across the positioner at maximum loop current.

The 10.0 VDC drop across the Logix 3200MD positioner terminals

is generated by the positioner from the 4-20 mA loop current input.

The actual voltage at the terminals varies from 9.8 to 10.0 VDC

depending on the current mA signal, HART communications, and

ambient temperature.

Figure 6: Field Termination

ANALOG

OUTPUT

HART

4-20 mA INPUT

Shielded Cable

4-20 mA Current Source

Connect Shield at Source

Ground 4-20 mA Current Source

Housing EARTH

Terminal

4-20 mA Feedback

Terminals (Optional)

HART Terminals

Field

Terminators

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 39 40

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Flowserve 3200MD User Manual Page 12

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