Siemens SIRIUS 3RT Series System Manual page 764

Glossary
Door-coupling rotary operating mechanism
Door-coupling rotary operating mechanisms enable motor starter protectors/circuit breakers
and compact starters to be operated with the control cabinet doors closed.
Electrical interlock
Electrical dependency between switching devices, implemented by means of circuitry.
Typical for contactor controls: A contactor may only be switched on if a different one has
previously been switched off, for example. Auxiliary contacts or auxiliary switches are used
to realize an electrical interlock.
Explosion protection
Prerequisite for using electrical equipment in hazardous areas conforming to DIN EN 50014
(VDE 0170/0171). In terms of explosion protection, you must ensure that equipment which
may generate explosive arcs (plasma) during operation is enclosed in a flameproof casing.
This means that, although the potentially explosive mixture could penetrate the enclosure, if
an explosion were to occur inside it then no explosive flame could escape.
Function module
Different function modules are used for:
● Direct-on-line start
● Reversing start
● Star-delta (wye-delta) start
Function modules are also available in communication-capable versions with AS-i or IO-Link,
in order to establish a connection to a higher-level control system.
Function module for direct-on-line start
This function module is used for the time-delayed switching of contactors.
Function module for reversing start
The function module for reversing start is used to control a reversing starter. The version
without a fieldbus interface consists of bridge modules, while the version for AS-Interface or
IO-Link comprises basic and coupling modules. In all three cases, the electrical interlocks for
protection in both directions are already in place.
Function module for star-delta (wye-delta) start
The function module for star-delta (wye-delta) start is used for toggling between star (wye)
and delta operation. It consists of one basic module and two coupling modules. The
electrical interlocks are already in place in the modules.
764
SIRIUS Innovations
System Manual, 01/2011, A8E56203870002-03