3500/22-01-02-00 Bently Transient Data Interface

Description

3500/22-01-02-00 Twisted, shielded instrumentation cable is strongly recommended for analog module input or

output signal connections. Proper grounding of the shield is also important. For maximum

electrical noise suppression, the cable shield should only be grounded at one end of the cable.

For Input modules, it is generally preferable to ground the end that is in the noisiest

environment (usually the field device end). 3500/22-01-02-00 For Output modules, ground at the module end.

See Chapters 10 (Analog Input), 11 (Analog Output), and 12 (Analog Combination) for

additional wiring information for specific modules.

Connections to an Analog module from user 3500/22-01-02-00 devices are made to screw terminals on a

removable 20-terminal connector block mounted on the front of the module. Actual terminals

used are shown in the specifications for the individual modules.

3500/22-01-02-00 The following methods are, for most applications, the preferred methods. However, in some

applications, alternate methods may be used successfully. The examples shown later in this

section discuss and illustrate a variety of possible wiring arrangements.

3500/22-01-02-00 Using a Terminal Strip

Mount a terminal strip inside the control enclosure and run a shielded cable from the

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

Connect each cable’s shield to one point on the metal panel next to the terminal strip.

When attaching to a painted surface, first remove the paint around the tapped hole and use

an appropriate ring terminal, machine screw, lockwasher and flat washer. Do do not

connect the shields at the module end (cut shield off at module end of cable and insulate

with shrink tubing).

Wire the field device to the terminal strip with a shielded cable, 3500/22-01-02-00 grounding the shield at the

device end only (cut shield off at terminal strip end of cable and insulate with shrink

tubing). If attaching shields to a painted surface, first remove the paint around the

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

and device ends as short as possible.

Direct Method

Run a shielded cable from the 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 field device end, exposing a minimum amount of conductor to the

noisy environment. If attaching shields to a painted surface, first remove the paint around

the tapped hole and use an appropriate ring terminal, machine screw, lockwasher and flat

washer. Do not connect the shield at the module 3500/22-01-02-00 end (cut shield off at module 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.

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