Cleco mPro300GCD-STO Serie Descripción Del Hardware página 16

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EN
8 STO Safety Function
The STO safety function enables the controller to provide a reliable solution for switching off the energy supply at the
output of the tool. If several units are wired in series with STO connector cables, the STO function is guaranteed for the
complete group.
STO = Safe Torque Off.
Compliance with standards see see chapter 9 Technical Data, page 22.
Risk of fatal injury due to electric shock
The STO safety function only provides protection against dangerous movements, not against electric
shock.
► Always comply with the stipulations of the documentation, in particular see chapter 2 Safety,
► Comply with the documentation for the other components.
► Ensure protection against the tool automatically restarting according to the required safety category
Note
Risk of the motor starting up when there multiple errors in the controller
If the final stage of the tightening module in the controller fails during the STO state (simultaneous short
circuit of 2 power semiconductors in different phases), there may be a limited locking movement of the
rotor in the motor. The angle of rotation corresponds to a pole pitch, which acts on the output drive with
the gear reduction. The angle of rotation for electric tools from Cleco is always ≤15°.
8.1 Performance Features
When the STO safety function is active, the power supply is safely interrupted by two separate shutdown paths to the
motor in the tool. The motor can not produce any torque and therefore no dangerous movements. There is no monitoring
of the standstill position. This is relevant, for example, for torques generated by loads, such as suspended loads, or by
preloaded spring drives. In such cases, additional measures for shutdown must be provided that prevent these reactions
- these must be ensured and brought about in a safety-related manner.
Reaching the STO safety function.
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• Potential-free feedback contact for the operating status.
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Danger
page 9.
emergency switching-off devices, e.g. via an external safety relay.
P2552HW | REV D l 2023-12 Apex Tool Group