Baumuller b maxx BM4400, Инструкция по эксплуатации

Страница: 342 / 360

Safe stop
Instruction handbook b maXX BM4400, BM4600, BM4700
Document No.: 5.12008.07 Baumüller Nürnberg GmbH
342
of 358
C.3
C.3.3 Application example for machine of category 3
The following diagram shows the use and cabling of a Baumüller b maXX 4000 converter in a
machine tool. Complying with category 3 (EN ISO 13849-1), in this machine tool the safe remov-
al of work pieces at an open cover, is possible.
m Application example for machine of category 3 with two shutdown channels:

Pulse enable and one safety relay.
Figure 115: Version with one safety relay (BM4XXX-XX1)
The switching-off of the electrical drive motor is executed dual-ported.
n S2 (NC contact) and S3 (NO contact) have hardware effects on the pulse enable input of the
converter (X3-5). Only if S2 and S3 display a closed cover (safe state), voltage is applied to
the pulse enable input of the converter.
n S1 (NC contact) has hardware effects on the safety relay of the converter. Only if S1 displays
a closed cover (safe state) voltage is applied at the safety relay input (X102: 3). A torque now
can be generated at the motor shaft. The NO contact of S1 is connected with the monitoring
circuit.
n The monitoring circuit is a fail-safe monitoring control of the category 3 (EN ISO 13849-1). It
checks the directly connected switching contacts of the position switch S1 (NO contact), S2
(NO contact) and S3 (NC contact). The control circuit will not receive an enable signal from
the monitoring circuit, if the cover is not completely closed or if a technically impossible state
of the position switch contacts occurs (for example S1 and S2 display different switch states
or if S2 and S3 show the same switch state). A missing enable signal of the monitoring device
leads to a direct switching off of the converter by means of the control circuit. If the monitoring