Baumuller BUM 62 T, User Manual

Page: 36 / 74

Installation
36
Mono Power Unit BUM 62 T
5.99009.03
Baumüller Nürnberg GmbH
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).
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.
y
S2 (NC contact) and S3 (NO contact) have hardware effects on the pulse release input of the con-
verter (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.
y
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.
y 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 impossible 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 control circuit will not get a release signal
from the monitoring circuit. A missing release signal of the monitoring device leads to a direct switch-
ing off of the converter by means of the control circuit. If the monitoring circuit has recognized an
error (for example different switch condition of S1 and S2), this is displayed to the operator and a
commissioning of the drive is not possible until the error has been repaired.
y The status signal contact of the safety relay (X68: 1,2; NC contact) can additionally be evaluated by
the monitoring circuit (not obligatory).