Siemens SINAMICS G130 Engineering Manual page 293

The following boundary conditions must be considered when using these safety functions:
- Simultaneous activation / deactivation at the Control Unit and the Power Unit.
- Supply with 24 V DC.
- According to EN 61800-5-1 and UL 508, only protective extra low voltage (PELV) must be connected to the
control connections and control terminals.
- DC supply cables must not exceed a length of 10 m.
- Unshielded signal cables are permissible without additional measures up to a length of 30 m. For longer
distances shielded cables must be used or appropriate measures against overvoltage must be installed.
- Maximum connection cross-sections: The connections of the components used with S120 Cabinet Modules
are located at the Control Unit CU320 and, either on the power unit (Booksize Units) or on the CIB board
(chassis units). Please refer to the chapter "General Engineering Information for SINAMICS", particularly to
the section "Safety integrated, drive-integrated safety functions". The connection cross-section which can
be connected is between 0.5mm (CU320) and 1.5mm (power unit / CIB).
- Due to the conditions inside the cabinet, the terminals are arranged at different positions in the cabinet.
- The unrestricted access to the terminals in the cabinet may be impeded by other components or covers for
protection reasons.
Option K82 was especially developed to coordinate these limitations with the requirements and conditions on site.
This is done by using interface relays, the control of which is electrically isolated and variable with a wide voltage
range of between 24 V and 230 V, DC and AC. The status information of the Safe Torque Off and Safe Stop1 safety
functions is available by using an optional feedback path. This may be necessary for connection of an external
control or external optical indication. The relays used have a second switch off path with which additional safety
circuits can be connected. Using the relays also allows the use of an unshielded control cable with a length of more
than 30 m. It is also possible to use option K82 in situations in which, due to long distances, no optimal equipotential
bonding can be achieved.
All signals are passed to a customer interface. For the wiring to for the system environment on site only one terminal
block is relevant which is always realized in the same way, despite its use in different modules. The maximum
connection cross-section is always 2.5mm2.
Operating Principles
Two independent channels of the integrated safety functions are controlled by two relays (K41, K42). The relay K41
controls the signal at the Control Unit required for the safety functions and relay K42 controls the corresponding
signal at the Motor Module. Activation and deactivation must be carried out simultaneously. The unavoidable time
delay caused by the mechanical switching of the relays can adapted by parameters. The circuit is protected against
wire breakage i.e. if the control voltage of the relays fails, the safety function becomes active. A check-back signal
can be created from the series connection of the relay contacts for information, diagnoses or fault finding purposes.
The check-back signal can be used optionally and is not part of the safety concept. The check-back signal is not
necessary to fulfill certified standards.
The activation of safety functions must be carried out with two independent channels. According to ISO 13850 / EN
418, a special switch with a forced opening contact according to IEC 60947-5-1, or another certified safety control
system must be used.
The following maximum cable lengths can be connected for the control of the safety functions (valid for lead and
return cable):
•
AC (Cable capacitance: 330 pF/m):
24 V: 5000 m
110 V: 800 m
230 V: 400 m
The values are valid for a frequency of 50 Hz. At 60 Hz the cable lengths must be reduced by 20 %.
•
DC (min. cross-section = 0.75 mm
SINAMICS S120 Cabinet Modules
2
): 1500 m
SINAMICS Engineering Manual - May 2008
Engineering Information
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