Safety relay
Manual Single Power Unit BUM64S/A/F
Document no.: 5.01056.03
111
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Application example for machine of category 3
Exemplary the following diagram shows the usage and cabling of a Baumüller converter of the
series b maXX in a machine tool, at which the safe taking of work pieces at opened barrier is
possible according to category 3 (EN 954-1).
Figure 31: Example for an application for safe stop according to category 3 (EN 954-1)
The switching-off of the electrical drive motor takes place dual-ported.
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S2 (NC contact) and S3 (NO contact) have hardware effects on the pulse release input of the
converter (X26: 14). Only if S2 and S3 display a closed cover (and therewith a safe condition)
voltage is being applied to the impulse release input of the converter.
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S1 (NC contact) has hardware effects on the safety relay of the converter. Only if S1 displays
a closed cover (and therewith a safe condition) voltage is applied to the safety relay input
(X68: 3) and therewith allows a torque generation at the shaft of the motor. The NO contact
of S1 is connected with the monitoring circuit.
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The monitoring circuit, a fail-safe monitoring control of the category 3 (EN 954-1), checks on
its own the directly connected switching contacts of the position switch S1 (NO contact), S2
(NO contact) and S3 (NC contact). If the barrier is not completely closed or a theoretical im-
possible condition of the position switch contacts is present (for example S1 and S2 show a
different switching condition or S2 and S3 show the same switching condition), then the con-
trol circuit will not get a release signal from the monitoring circuit. A missing release signal of
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