3-3Operating Manual: PSS 3075-3 Series
For category 4 applications, shorts between the input contacts must be
detected. This can be achieved through the use of test pulses on the PSS
or, depending on the type of input device, through a feasibility test or
through detection of shorts across the contacts on the input device (e.g.
light barrier) (for connection examples please see Chapter 7, “Wiring the
Inputs and Outputs”).
Single-pole outputs (DOS)
An additional shutdown route means that the outputs on the PSS can be
used in single-channel operation for applications up to category 3 in
accordance with EN 954-1 (03/97). Please note that in this case a
feedback circuit must be used.
To achieve category 4, two actuators must be connected in series to two
different outputs.
Dual-pole outputs (DOZ)
The dual-pole outputs can be used for applications up to
category 4 in accordance with EN 954-1 (03/97).
Safety guidelines
Failure to keep to these guidelines will render all warranty and liability
claims invalid:
• All health and safety / accident prevention regulations for the particular
area of application must be observed.
• Before using the unit it is necessary to perform a safety assessment in
accordance with the Machinery Directive 98/37/EC.
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