Enclosures Section 2 Installation
64 3BSE036351-510 A
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 3 on page 64.
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 SD83X series of power supply units comfortably handle the short power
interruptions (<20 milli seconds) that may 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.
The AC 800M controller will shut down safely in the event of a power failure.
During down-time, the application memory and the system clock will be backed up
by the internal battery. In systems subject to long non-operational periods, it is
recommended that an external battery back-up unit be installed. When the power
supply is reconnected, the AC 800M Controller will re-start and run the application
as normal.
If the effects of unexpected shutdowns are not acceptable, it is highly recommended
that the AC 800M Controller be fully protected by connection to an Uninterruptable
Power Supply (UPS) source.
Enclosures
The AC 800M and S800 I/O units hold protection class IP20, with each unit being
individually CE-marked. If a higher IP class is required, an additional enclosure is
needed.
Table 3. External Mains Supply – Fuse Rating
Fuse Rating Fuse Type
10 A Delayed action fuse
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