Siemens SIMOTICS S-1FL6, Руководство по эксплуатации

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Safety Integrated function
8.4 Safety Integrated basic functions
SINAMICS V90, SIMOTICS S-1FL6
310
Operating Instructions, 04/2019, A5E36037884-007
Functional features of "Safe Torque Off"
● This function is integrated in the drive; this means that a higher-level controller is not
required.
● The function is drive-specific, i.e. it is available for each drive and must be individually
commissioned.
● When the "Safe Torque Off" function is selected, the following applies:
–
The motor cannot be started accidentally.
– The pulse suppression safely disconnects the torque-generating energy feed to the
motor.
– The power unit and motor are not electrically isolated.
● By selecting/deselecting STO, the safety messages are automatically withdrawn.
The STO function can be used wherever the drive naturally reaches a standstill due to load
torque or friction in a sufficiently short time or when "coasting down" of the drive will not have
any relevance for safety.
WARNING
Personal injury or device damage resulting from the unexpected movement of the motor
after the energy feed is disconnected
The motor may has a undesirably move once the energy feed has been disconnected. This
may lead to a personal injury or device damage.
• Take appropriate measures to ensure that the motor does not undesirably move in this
case, e.g. against coasting down.
CAUTION
Personal injury or device damage resulting from the simultaneous failure of two power
transistors in the inverter
If two power transistors (one in the upper and one in the lower bridge) simultaneously fail in
the drive, this can cause brief momentary movement. For a synchronous rotary motors, the
maximum movement is 180 °/No. of pole pairs. For a synchronous liner motor, the
maximum movement is the pole width.
•
Take suitable measures to prevent unexpected drive movement, for example, by using a
brake equipped with safety monitoring.
Note
Closing delay of the holding brake
The closing signal (low level) of the holding brake is output 30 ms after the STO is triggered.