Festo — CMMT-AS-...-S1 — 2021-04d
Additional information
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If the device is operated in IT networks, the potential conditions will change in the event of a fault
(earth fault on the feeding mains supply). As a result, the rated voltage of 300 V to PE – which has
important implications for the design of insulation and network disconnection – will be exceeded.
This error must be detected.
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Use of a diagnostic output for connection of a safety function.
The diagnostic outputs STA and SBA are not part of the safety circuit. The diagnostic outputs are
used to improve diagnostic coverage of the related safety sub-function. The diagnostic outputs
may only be used in combination with the related safe control signals (AND operation) plus a
reliable time monitoring function in the safety relay unit for the purpose of switching additional
safety-critical functions.
Foreseeable misuse of the safety sub-function STO
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Use of the STO function without external measures for drive axis influenced by external torques.
If external torques influence the drive axis, use of the safety sub-function STO on its own is
not suitable for stopping the axis safely. Additional measures are required to prevent dangerous
movements of the drive axis, such as use of a mechanical brake in combination with the safety
sub-function SBC.
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Disconnection of the motor from the power supply.
The safety sub-function STO does not disconnect the drive from the power supply as defined by
electrical safety.
Foreseeable misuse of the safety sub-function SBC
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Use of an unsuitable holding brake or clamping unit, also in view of:
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Holding or brake torque and emergency brake characteristics, if required.
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Frequency of actuation
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Use of an unsuitable logic voltage supply
2.4
Training of qualified personnel
The product may be installed and placed in operation only by a qualified electro technician, who is
familiar with the topics:
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installation and operation of electrical control systems
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applicable regulations for operating safety-engineering systems
Work on safety-related systems may only be carried out by qualified personnel trained in safety
engineering.
2.5
CE marking
The product has the CE marking.
The product-related EC/EU directives and standards are listed in the declaration of conformity
2.6
Safety engineering approval
The product is a safety device in accordance with the Machinery Directive. For details of the safety-ori-
ented standards and test values that the product complies with and fulfils, see
3
Additional information
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Contact the regional Festo contact if you have technical problems