ABB power board SDCS-PIN-41A ABB module NW271 NW272

Description

SDCS-PIN-41A The external power supply used with the module must provide sufficient field power for the

module during short circuit events.

When a load is shorted, an inadequate external power supply may allow field power to drop below

the specified operating range, causing misoperation of the module. The external power supply must

be capable of providing short circuit energy without degradation of output voltage levels. The

amount of energy required depends on the number SDCS-PIN-41A of simultaneously-shorted points that might

occur. Refer to power supply short circuit operation specifications prior to selecting the power

supply to be used with the module.

SDCS-PIN-41A Local energy storage (either batteries or capacitors) can be used to compensate for insufficient

power supply characteristics.

Important Note: Additional best practices including minimizing wiring resistance from the

external power supply to the module, preventing voltage drop during short circuit energy transfer

SDCS-PIN-41A The Terminal Block with box terminals has 25 terminals per module, 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). Using an external jumper reduces wire

capacity from AWG #14 (2.10mm2 ) to AWG #16 (1.32mm2 ).

The I/O Terminal Block with barrier terminals has 18 terminals per module. Each terminal can

accommodate one or two wires up to AWG #14 (avg 2.10mm2 cross section).

The I/O Terminal Block with Connectors has one 20-pin male connector per module.

The following illustration shows terminal assignments for the 24 VDC Electronic Short Circuit

Protection Output Module. The eight outputs form one group, with a common return.

The same 24 volt power supply used for the Bus Interface Unit can provide loop power in most

cases. Separate power supply(s) must be used if isolation between circuits is required. The most

common application uses a loop supply local SDCS-PIN-41A at the module to drive multiple isolated transducers,

isolated analog inputs, or differential analog inputs.

LED

An LED, visible through the transparent portion of the module top, is on when both backplane and

field power are present, and the fuse is not blown.

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