Flowserve 400MD Logix - Manual (Page 21)

Inside the electronics housing of the Logix 3400MD digital positioner is the terminal block for connecting external wiring as shown in Figure
5.5. Table 5.2 explains the usage of the wiring terminals for fieldbus use.
Figure 5.5 Logix 3400MD Digital Positioner Terminal Block
Table 5.2 Logix 3400MD Digital Positioner Wiring Terminals
Wiring Terminal Use
Screw terminals Non-polarized Fieldbus cable connections
Internal Ground Connection
An internal ground terminal is available next to the terminal. (See Figure 5.5.) The terminal can be used to connect the Logix 3400MD digital positioner to
earth ground.
External Ground Connections
While grounding the Logix 3400MD digital positioner is not necessary for proper operation, an external ground terminal on the outside of
the electronics housing provides additional noise suppression as well as protection against lightning and static discharge damage. Note that
grounding may be required to meet optional approval body certification.
Intrinsically Safe Applications
Fieldbus barriers should be installed per manufacturer’s instructions for Logix 3400MD digital positioners to be used in intrinsically safe ap-
plications.
The Logix 3400MD digital positioner carries an intrinsically safe barrier rating of 125 mA. Currents up to 125 mA will not damage the device.
The number of field devices on a segment may be limited due to power limitations in hazardous area installations. Special fieldbus barriers and
special terminators may be required. Also, the amount of cable may be limited due to its capacitance or inductance per unit length.
Detailed Intrinsically Safe Information
Refer to Fieldbus Foundation document AG-163, 31.25 kbit/s Intrinsically Safe Systems Application Guide, for detailed information on connect-
ing fieldbus devices for intrinsically safe applications.
Logix 3400MD Digital Positioner Wiring Procedure
The following procedure shows the steps for connecting fieldbus cable to the Logix 3400MD digital positioner.
CAUTION: All wiring must comply with local codes, regulations, and ordinances.
1. Loosen end-cap lock and remove end-cap cover from terminal block end of positioner housing.
For reference purposes
Logix 3400MD Digital Positioner LGENIM3405-02 11/13
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