ABB ScreenMaster RVG200 Manuel utilisateur

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ABB MEASUREMENT & ANALYTICS | SERVICE INSTRUCTION

ScreenMaster RVG200

Paperless recorder

Terminal block failures

1 Introduction

There have been instances reported where some or

all inputs on an RVG200 analog input card have

shown as failed immediately after installation, with

no apparent cause for the failure. In rare cases, this

can be attributed to a faulty analog input card but

the most common cause has been identified as a

problem affecting the connection strips within the

terminal block assembly.

The reason for potential failure is that during

installation, unscrewing the terminal connection,

inserting the wire and tightening the screw can

cause the spring assembly inside the terminal block

to move, breaking its contact with the PCB.

2 Action

Action when fault reported Action at next service

Information only Recall instruments

3 Tools/Equipment required

• Medium, flat-bladed screwdriver

• Anti-static strap or anti-static workbench

4 Identifying failures

WARNING

Bodily injury

Isolate all power supplies to the recorder before

removing the terminal cover.

NOTICE

Damage to equipment

The recorder is vulnerable to electrostatic

damage. Wear an anti-static strap or dismantle

the unit on an anti-static workbench.

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ScreenMaster RVG200

terminal block

SI/RandC/001-EN Rev. A 08.2019

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We reserve the right to make technical

changes or modify the contents of this

document without prior notice. With

regard to purchase orders, the agreed

particulars shall prevail. ABB does not

accept any responsibility whatsoever for

potential errors or possible lack of

information in this document.

We reserve all rights in this document and

in the subject matter and illustrations

contained therein. Any reproduction,

disclosure to third parties or utilization of

its contents – in whole or in parts – is

forbidden without prior written consent

of ABB.

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ABB Limited

Measurement & Analytics

Howard Road, St. Neots

Cambridgeshire, PE19 8EU, UK

Tel: +44 (0)870 600 6122

Fax: +44 (0)1480 213 339

Email: instrumen[email protected]

abb.com/measurement

ABB Inc.

Measurement & Analytics

125 E. County Line Road

Warminster, PA 18974

USA

Tel: +1 215 674 6000

Fax: +1 215 674 7183

…4 Identifying failures

Referring to Figure 1:

1 Isolate the recorder from the power supply.

2 Press down into recess Aand pull terminal cover B

away from the case.

3 Insert a flat-bladed screwdriver into each slot Cin turn

(2 slots) to release the locking arm and pull terminal block

Daway from the case.

4 Check the position of spring contacts Ewithin the terminal

block assembly.

The correct position for the contacts is as shown in Figure 1

– each contact must be positioned a minimum of halfway

across the slot in which the module board fits.

5 If a contact is positioned incorrectly or is damaged, replace

the terminal block assembly.

6 Fit the terminal block.

7 Refit terminal cover B.

Figure 1 Examining the terminal block contacts

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