DEMAG DIC 002 Series Operating Instructions Manual page 11

The STO "safe torque off" safety function according to DIN EN 61800-5-2 protects people from personal injury
and the installation and operation from mechanical damage if the system is correctly specified.
This function does not disconnect the installation from the power supply.
The STO "safe torque off" safety function can be used to implement "emergency stop" according to EN 60204 –
the line voltage can remain connected to the frequency inverter.
Follow the personal safety and accident prevention instructions below.
DANGER
Inappropriate assembly and installation work
Danger to life and limb. Risk of material damage.
– The STO "safe torque off" safety function may only be installed and put into service by qualified personnel.
– The STO "safe torque off" safety function does not provide an emergency off according to the EN 60204
standard. Emergency off can be achieved by installing a line contactor.
– Emergency stop according to EN 60204 must function in all of the frequency inverter operating modes. Re‐
setting an emergency stop must not allow the drive to start up without any control.
– The drive will restart when the STO "safe torque off" safety function is no longer triggered. To comply with
standard EN 60 204, external measures must be taken to ensure that the drive will only restart after ac‐
knowledgement is given.
– The drive can run on if no mechanical brake is used; the motor will coast to a standstill. If this results in a
risk of personal injury or damage, additional protective devices must be installed.
– If the STO "safe torque off" safety function results in a risk of personal injury following cut-off of the motor
power supply, access to any hazard areas must be prevented until the drive comes to a standstill.
– Check the STO "safe torque off" safety function at regular intervals according to the results of your risk
analysis. We recommend that the check be carried out after one year at the latest.
– The STO "safe torque off" safety function is single-fault tolerant. In rare cases, however, component fail‐
ures may cause the motor shaft to jolt (maximum of 180°/pair of poles, e.g. sudden movement of 90° for a
4-pole motor, 180°/2). A check must be carried out to establish whether this causes a dangerous move‐
ment of the machine.
– If the STO "safe torque off" safety function is employed, special safety, installation and operating instruc‐
tions must be followed.
DANGER
Live components
Danger to life and limb.
The STO "safe torque off" safety function is only suitable for mechanical work on driven machines and not suita‐
ble for work on live parts.
– After an external 24 V DC power supply is switched off, the supply voltage is still applied to the DC link of
the frequency inverter.
– High voltages may still be applied to the motor terminals even if the power supply to the motor is switched
off and if the motor is running down or at standstill.
– If the light emitting diodes go out or fail, this does not indicate that the frequency inverter is de-energised.
– The system must be disconnected from the mains power supply (main switch) before any work (e.g. main‐
tenance) is carried out on live parts. This must be documented on the installation.
– Only carry out maintenance and installation work when all cables, motor terminals and capacitors are at
zero potential (check with a voltmeter).
– The motor is not disconnected from the DC link of the frequency inverter when the STO "safe torque off"
safety function is triggered. The motor may carry high voltages.
– Do not touch live terminals.
Except for its implemented "STO safe torque off" function, the frequency inverter and its control system must not
be used as safety components in the sense of Machinery Directive 2006/42/EC. The unit must not be put into
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