ABB RCNA-01 Converter ACS800 Series Bus Adapter

Description

RCNA-01 If noise is generated by a protective contact that operates only in abnormal conditions, not as part

of the normal machine cycle, the best way to handle possible control shutdown which may occur

during machine faults depends on the application. Normally, re-cycling module control power will

enable resumption of operation.

RCNA-01 The problem with mixing control and power-level wiring is that while high fields due to steady

state voltage and currents are seldom a problem, high-level switching transients can couple through

the wiring. The source can be difficult to identify, and nearly impossible to suppress due to the high

power levels involved. The amount of coupling depends on the length and proximity of the wires.

Wires that cause a problem because of contact within a conduit may be no problem when installed

separated by a few inches in a cable tray. The electrical wiring and safety codes specify separation

by voltage and/or power levels for shock and flammability hazards, but do not address interference.

Most PLC I/O should be treated as low-power remote control; example USA National Electric

Code Article 725, or Canadian Electric Code Section 16. The modest segregation required is likely

sufficient to reduce the interference to the typical environmental levels used by the noise Standards.

A documentation of PLC wiring practices is RCNA-01 contained in part 4 of the International Standard for

PLCs IEC1131-4.

Analog I/O Wiring

Analog I/O points may require 2 to 4 wires per point, not including terminations for shielded wire.

Signal-carrying wires may have varying degrees of isolation from the associated analog power

supply, which itself may be floating or grounded.

The various types of analog points also have different requirements for power, ground, and

common connection. Extra care is needed to prevent wiring errors.

RCNA-01 If the protective label is still in place on the I/O Terminal Block, remove it before attempting to

install an I/O Module.

Adding I/O Module Keying (optional)

Each type of I/O module is uniquely slotted. (Optional) to assure installation of the correct module

type in a specific position, insert the key clips provided into the appropriate lettered slots in the I/O

Terminal Block (after removing the protective label).

Installing an I/O Module on the Base

1. Before installing a new module, remove the cable slot knockout(s) wherever the module would

cover the terminal board connecting cables. The knockout can be removed with pliers, or by

pressing out from inside the module housing.

2. To install an I/O module, position the module so that the cable slot in the module housing is

over the connecting cable.

Connecting Cable

(cross section)

Cable Slot

End View

When installing a module over a 21 inch (54-cm) I/O Expansion Cable, fit the edge of the

module housing into the groove in the cable strain relief.

Groove

3. Press the module down firmly.
4. If you feel resistance, remove the module and check the keying (if keying has been used). Also

be sure the connecting cable is in the cable slot properly.

5. After placing an I/O module onto the base, tighten its bolts to secure it. Maximum

recommended torque is 9 in/lbs

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