Tsino Dynatron CoolDrive Series, User Manual

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Safety features
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Chapter 11 Safety features
Overview 11.1
Safety features are defined in IEC61508-1:

One or more safety-related systems of electrical/electronic/programmable electronic devices are included;

Possible dangers caused by the failures of the safety functions performed by E/E/PE safety-related systems are included;

The focus is on the E/E/PE safety-related systems whose failures affect human and/or environmental safety;

E/E/PE safety-related systems, other technical safety-related systems, and external risk reduction facilities are considered,
in order to systematically determine the safety specifications for E/E/PE safety-related systems in a risk-based manner.

With the overall safety life cycle model serving as the technical framework, the activities that are needed to ensure the
functional safety of E/E/PE safety-related systems are systematically discussed.
The CDS7 servo drives have built-in safety features to protect operators from dangerous movements of the moving parts of
the machine, reduce the risk of using the machine, and improve its safety.
The CoolDrive Smart7 servo drives feature safety through Safety Torque Off (STO) to prevent accidental starts and
uncontrolled stops.
This section describes the features and uses of the CoolDrive Smart7 series servo drives' STO function.
Not all drives from the CoolDrive Smart7 product series pass the certification for functional safety, and
the information in this manual applies only to the certified drives.
Definition of STO function 11.2
STO function is defined as uncontrolled stop in EN/IEC 61800-5-2 and corresponds to the stop class 0 in IEC 60204-1.
The safety requirements of speed-regulating electrical drive system are defined in EN/IEC 61800-5-2. According to this
standard, power motor that may cause motion will not be applied when the STO function is enabled. STO function can be used
in situations where power-off is required to prevent accidents.