B&R 7AO352.70 drive

B&R 7AO352.70 drive

Technical data of product parameters

The expansion bus accessed from the right hand edge of the T9100 processor 7AO352.70
base unit is designated I/O Bus 1, while the bus accessed from the left hand
edge is designated I/O Bus 2. The module positions (slots) in the I/O base units
are numbered from 01 to 24, the left most position being slot 01. Any individual
module position within the controller can thus be uniquely identified by the
combination of its bus and slot numbers, for example 1-01.source that complies with SELV and PELV standards.
• SELV (safety extra-low voltage) is a voltage which is no larger than 30
Vrms, 42.4 Vpeak and 60 Vdc between conductors, or between each
conductor and earth in a circuit which is isolated from the line voltage by
a safety transformer.
• PELV (protected extra-low voltage) is an extra low voltage circuit with a
protective partition from other circuits which has a protective earth
connection.
To satisfy SELV and PELV requirements the power source must have a safety 7AO352.70
transformer with a protective partition between the primary and secondary
windings so that the windings are galvanic and electrically isolated.The power supplies and power distribution, if incorrectly designed, are a
possible electrical or fire safety hazard and can contribute to common cause
failure. It is therefore necessary to:
• Establish the power philosophy, specific earthing philosophy, power
requirements, and the separation requirements where items of
equipment are separately supplied, for example system internal supplies
and field loop supplies. 7AO352.70
• Make sure that the chosen Power Supply Units (PSUs) are compatible
with the power feeds supplied. Alternatively, measures must be put in
place to make sure that the power feeds stay within the specifications of
the PSUs.
• Define the power distribution requirements, together with the protective
philosophy for each distribution; for example, current limited at source
or protective devices. Where protective devices are used, it is important
to find out that sufficient current will be available to make sure their
protective action and the protective device can break the maximum
prospective fault current

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