ABB Electronic relays General Product Line Information
Electronic relays
Safety
Electronic
Safety relays
7
7
Description
The C57x series covers 10 safety relays
which perform safety functions on machines.
Their fi elds of application extend from
emergency-stop circuits through guard
door monitoring functions and tread mats to
presses and punches. All C57x products are
UL Listed, CSA approved and bear the CE
Mark.
All safety relays can be used on the basis
of their classifi cation into the risk categories
to EN 954-1, they are approved by the
employersʼ liability insurance associations
and/or the German Technical Inspection
Authority (TÜV) and comply with the
requirements of EN 60204, Part 1.
Redundancy is achieved by series-connection
of two N.O. contacts. These N.O. contacts are
located in two mutually independent, positiveaction, all-or-nothing relays which monitor
each other by means of a special-purpose
circuit.
Diversity is provided thanks to the
combination of N.C. contact and N.O. contact.
Cyclic monitoring of the safety circuit in each
On/Off cycle ensures maximum reliability.
Thanks to the two-channel control and/or
control which is immune to shorts across
contacts, it is also possible to monitor signalling
devices such as emergency-stop buttons or limit
switches of the guard doors. This ensures the
required level of safety even on systems subject
to a high level of pollution.
In the event of a fault or error, the safe state of
the system is achieved directly after opening
the safety contacts. These enable circuits are
N.O. contacts which open reliably in the event
of fault or error and thus reliably switch off the
potentially hazardous drives or machines.
Additional signalling contacts, N.C. contacts
which close in the event of a fault or error or
semiconductor outputs, are available, depending
on the type of equipment.
Easy, reliable and fast wiring is achieved by
a clear and manageable terminal designation
system. This allows wiring errors to be
minimized.
In addition to all these safe features, the C57x
safety relays correspond to the product design of
ABBʼs range of switchgear and control systems.
They fi t in perfectly with the overall design of the
switch cabinet.
Electronic
Low Voltage Products & Systems 7.19
Safety relays
AC 1000 - 11/03
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