The C57x series covers 10
safety relays which perform safety functions on machines. Their fields
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 classification into the risk categories to EN 954-1, they
are approved by the employers' 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, positive-action,
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 ABB's range of switchgear and
control systems. They fit in perfectly with the overall design of
the switch cabinet. |
