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V2 AC500 Hardware 1-13 System data AC500 / Issued: 05.2007
Assembly with screws
If the Terminal Base should be mounted with screws, Wall Mounting Accessories TA526 must be
inserted at the rear side first. These plastic parts prevent bending of the Terminal Base while screwing
on. TB511 needs one TA526, TB521 and TB541 need two TA526.
Holes for wall mounting
1
2
1
3
Rear view
Rear view
Front view
Figure: Fastening with screws of the Terminal Base TB521-ETH (as an example)
1 The two Wall Mounting Accessories TA526 are snapped on the rear side of the Terminal Unit like DIN
rails. The arrows point to the middle of the Terminal Base. One TA526 is turned by 180°.
2 Two accessories for wall mounting inserted
3 Terminal Base, fastened with screws
By wall mounting, the Terminal Base is earthed through the screws. It is necessary that
• the screws have a conductive surface (e.g. steel zinc-plated or brass nickel-plated)
• the mounting plate is earthed
• the screws have a good electrical contact to the mounting plate
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