ABB AC500 - Page 71

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G1 Introduction to AC500 1-69 AC500 / Issued: 07.2006
Panel mounting
If the Terminal Unit should be mounted with screws, a Wall Mounting Accessory TA526 must be inserted
at the rear side first. This plastic part prevents bending of the Terminal Unit while screwing on.
1
2
Front view
Rear view
Rear view
Holes for
wall mounting
31
Figure: Fastening with screws of the Terminal Unit TU516 (as an example)
1 The Wall Mounting Accessory TA526 is snapped on the rear side of the Terminal Unit like a DIN rail.
The arrow points to the right side.
2 Accessory for wall mounting inserted
3 Terminal Unit, fastened with screws. Use two screws per module. Use M4 or #8 pan head screws.
Mounting screws are required on every module.
By wall mounting, the Terminal Unit 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
The following procedure allows you to use the assembled modules as a template for drilling holes in the
panel. Due to module mounting hole tolerance, it is important to follow these procedures:
1. On a clean work surface, assemble no more than three modules.
2. Using the assembled modules as a template, carefully mark the center of all module-mounting
holes on the panel.
3. Return the assembled modules to the clean work surface, including any previously mounted
modules.
4. Drill and tap the mounting holes for the recommended M4 or #8 screw.
5. Place the modules back on the panel and check for proper hole alignment.
6. Attach the modules to the panel using the mounting screws.
TIP: If mounting more modules, mount only the last one of this group and put the others aside.
This reduces remounting time during drilling and tapping of the next group.
7. Repeat steps 1 to 6 for any remaining modules.