ABB ScreenMaster RVG200 User manual

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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.
–
ScreenMaster RVG200
terminal block

SI/RandC/001-EN Rev. A 08.2019
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potential errors or possible lack of
information in this document.
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in the subject matter and illustrations
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© ABB 2019
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Measurement & Analytics
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Cambridgeshire, PE19 8EU, UK
Tel: [phone]
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Tel: [phone]
Fax: [phone]
…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
A
B
C
D
E