Siemens SINAMICS G130 Engineering Manual page 498

Description of Options
Engineering Information
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 IEC 61800-5-1 and UL 508, it is only permissible to connect safety extra-low voltages (PELV)
to the control terminals.
- The length of DC supply cables must not exceed 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-section of terminals: The connections of the components used with S120
Cabinet Modules are located on the CU320-2 Control Unit and on the power unit (Booksize format), or on
the CIM module of the power unit (Chassis format), see section "Safety Integrated / Drive-integrated safety
functions" in chapter "General Engineering Information for SINAMICS". The connectable cable cross-
section is 1.5 mm
- As these terminals are located on different components, they are distributed around the cabinet.
- The unrestricted access to the terminals in the cabinet may be impeded by other components or covers for
protection reasons.
Option K82 has been specially developed to coordinate these limitations with the requirements and conditions on site
and to simplify the handling of the safety functions.
This is achieved by using interface relays, the control of which is electrically isolated and within a wide variable
voltage range of between 24 V and 230 V, DC or AC. A feedback path can be used optionally to give the status
information of the "Safe Torque Off" or "Safe Stop1" function. This might be necessary, for example, in order to
connect an external control or an external optical indication. The relays used also feature a second switch-off path for
connecting further safety circuits. The use of these relays also means that unshielded control cables with lengths of
more than 30 m can be used in the control circuits of the safety functions. K82 is also a useful option in extensive
installations in which it is impossible to achieve ideal equipotential bonding.
All signals are routed to a compact customer interface. The option is wired up to the plant from a single terminal block
which is identical in design on all modules. The maximum connectable cable cross-section is 2.5 mm
Operating Principles
Two independent channels of the integrated safety functions are controlled by two relays (K41 and 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 be adapted by parameters in the firmware. 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 the certified standards.
The activation of the 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: 300 pF/m):
§ 24 V:
§ 110 V:
§ 230 V:
The values are valid for a frequency of 50 Hz. At 60 Hz the cable lengths must be reduced by 20 %.
·
DC (minimum cross-section 0.75 mm
§ 1500 m
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Ó Siemens AG
2
on the CU320-2 Control Unit and the power unit in Chassis format (CIM module).
5000 m
800 m
200 m
2
/ maximum connectable cross-section 2.5 mm
2
.
2
):