ABB SDCS-PIN-48-SD 3BSE004939R1012 frequency converter trigger board

Description

SDCS-PIN-48-SD The 250 ohm resistor converts input current to a voltage with respect to common. The input R-C

filters high-frequency noise, while the opamp buffers the signal to the analog/digital converter. All

eight +24 VDC Out terminals are common to each other. SDCS-PIN-48-SD The chassis ground goes to the I/O

Terminal Block ground terminal.

SDCS-PIN-48-SD The input signals share a single signal common return. For good noise immunity, establish system

signal commons, power supply reference points, and grounds close to such single-ended points.

Signal common (as defined by most Standards) for the input module is the negative side of the 24

volt supply. The module’s chassis ground goes to the I/O Terminal Block ground terminal. To

improve noise immunity, connect this to the enclosure chassis with a short length of wire.

Two wire loop powered transmitters (type 2) should have isolated or ungrounded sensor inputs.

Loop powered devices should use the same power supply as the input module. If a different supply

must be used, connect the signal common to the module common. Also, SDCS-PIN-48-SD ground only one point on

the signal common, preferably at the input module. If the power supply is not grounded, the entire

analog network is at a floating potential (except for the cable shields). Thus this circuit can be

isolated if it has a separate isolated supply.

SDCS-PIN-48-SD If shielded wire is used to reduce noise pickup, the shield drain wires should have a separate path to

ground from any loop power supply ground to avoid inducing noise due to drain current.

Three wire transmitters require a third wire to provide power. The shield may be used as the

power supply return. If the system is isolated, a third wire (triad cable) should be used instead of

the shield for the power, and the shields grounded.

A separate, remote power supply can also be used. A floating supply should be used for best

results. Grounding both supplies creates a ground loop. The circuit may still work despite this,

however achieving good results requires very good voltage compliance of the transmitter.

Isolated 4 wire transmitters can avoid ground loop problems with remotely powered sensors.

If the module is installed on an I/O Terminal Block with Barrier Terminals or an I/O Terminal

Block with Wire to Board Connectors, additional wiring terminals are needed. For an I/O Terminal

Block with Barrier Terminals, an Auxiliary SDCS-PIN-48-SD Terminal Block can be used. For the I/O Terminal

Block with Wire to Board Connectors, external connection points are usually preferred, although an

Auxiliary Terminal Block can also be used.

Auxiliary Terminal Blocks have all terminals connected together internally. The Auxiliary

Terminal Block with box terminals has 13 terminals, each of which accommodates one AWG #14

(avg 2.1mm2 cross section) to AWG #22 (avg 0.36mm2 cross section) wire, or two wires up to

AWG #18 (avg. 0.86mm2 cross section). The Auxiliary Terminal Block with barrier terminals has

nine terminals, each of which can accommodate one or two wires up to AWG #14 (avg 2.1mm2

cross section)

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