Bently Nevada 3500/42M Proximitor/Seismic Monitor

Description

3500/42M General Analog Output Wiring Methods

Each output should be connected using a good quality shielded wire with the cable shield

grounded at the module end. See Chapter 9 for more information.

Using Generic Terminal Block or Strip

Mount a terminal strip inside the control 3500/42M enclosure and run a shielded cable from the

terminal strip to each output circuit on the module’s terminal board terminals.

Ground each cable’s shield at the module end to a single GND terminal on the module’s

terminal board. 3500/42M Connect each cable shield to its own terminal on the terminal strip.

Wire the field device to the terminal strip with shielded cables, connecting each shield to

the terminal that has the corresponding shield for the cable that connects to the module

terminal board. Using this arrangement, the shields are “carried through” the terminal

strip. (This is illustrated in the section “ Analog Output Shield Grounding Example

Three.”) Also, keep the length of exposed (outside of shield) leads at the terminal strip and

device ends as short as possible.

3500/42M Direct Method

Run a shielded cable from each field device (transducer, potentiometer, etc.) directly to the

module.

Connect the conductors to the applicable screws on the module’s terminal board.

Ground the shield at the module end only, 3500/42M exposing a minimum amount of conductor to the

noisy environment. Do not connect the shield at the device end (cut shield off at device

end of cable and insulate with shrink tubing).

TBQC Not Recommended for Analog Modules

The Terminal Block Quick Connect (TBQC) Assembly is not recommended for use with analog

modules due to cable shielding requirements.

For analog output modules, the shield is normally grounded at only the source end (the module)

as shown in Figure 3-9. The GND connection provides access to the baseplate (frame ground)

resulting in superior rejection of noise caused by any shield drain currents. In extreme noise

environments, you can connect a ground braid from the GND terminal to an external earth

ground to bypass noise around the module (see “Analog Output Shield Grounding Example

Two”)

3500/42M If using a terminal strip between the analog output module and the field devices (user loads),

use the method in the following figure for grounding the cable shields. Note that each cable is

only grounded at one end – the end closer to the Analog Output Module. An optional external

ground connection to the output module’s GND terminal is shown for installations that require

extra noise suppression.

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