8 STO (safe torque off)
8.3 Requirements for using the product
Make this documentation available to the design engineer, installation technician and
personnel responsible for commissioning the machine or system in which this product is
used.
Ensure that the specifications of the documentation are always complied with. Also take
into account the documentation for the other components (e.g. safety relays, cables, etc.).
Take into consideration the legal regulations applicable at the installation site as well as:
l regulations and standards
l regulations of the testing organisations and insurers
l national specifications
l all of the safety instructions in section 2 For your own safety on page 16
l the special safety instructions in section 8.1 Special safety instructions on page
193
For emergency stop applications, protection against automatic restarting must be
provided in accordance with the required safety category. This can be realised, for
example, by way of an external safety relay.
8.3.1 Qualification of the specialist personnel (personnel
requirements)
The device may only be set into operation by a qualified electrical technician who is
familiar with:
l the installation and operation of electrical control systems
l the applicable regulations for operating safety-oriented systems
l the applicable regulations for accident protection and industrial safety
l the documentation for the product.
8.3.2 Diagnostic coverage (DC)
The diagnostic coverage depends on the integration of the safety functions, which are
integrated in the servo drive, into the overall system and on the implemented diagnostic
measures.
If a malfunction is detected during the diagnosis process, appropriate measures must be
taken to maintain the safety level.
Cross-circuit detection
Check whether your application requires a cross-circuit detection of the input circuit and
of the connecting wiring.
If necessary, use a safety relay with cross-circuit detection for actuating the safety
function.
Product manual BL 4000-C Page 194 of 298
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