Section 2 Installation Power Supply
3BSE 027 941 R301 47
Safety Switch
A safety switch must be installed in the immediate vicinity of a controller
installation to allow for immediate total power supply disconnection to the
equipment, should the need arise. However, the prime function of the safety switch
is to provide a means of isolating the power supply completely during maintenance.
The safety switch must be installed in a location where it is both easily accessible
and clearly visible, i.e., outside any enclosure or cabinet.
Protective Ground
Always install a protective ground connection on equipment connected to a
230 VAC supply.
Fusing the External Mains Supply Cable
The recommended fuse rating for the external mains supply of a standard AC 800M
Controller configuration, housed within a floor or wall-mounted cabinet, is given in
Table 5 on page 47.
Should the configuration be other than that stated, instructions for calculating
current consumptions can be found in the relevant I/O manual. For the
AC 800M Controller, see Appendix B, Power Consumption.
Uninterruptable Power Supply
The SD82x series of power supply units comfortably handle the short power
interruptions (<20 ms) that y occur normally within an industrial environment.
Despite this, it is sometimes necessary to protect certain applications against brief
voltage failures by the installation of an Uninterruptable Power Supply (UPS)
device.
Table 5. External Mains Supply – Fuse Rating
Fuse Rating Fuse Type
10 A Slow to Rupture
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