Lenze E94AYAE SM301 - Manual (Page 9)

Safety engineering
Basics
Safety instructions
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9 EDS94AYAE EN 7.0
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Danger!
When the request for the safety function is deactivated, the drive can restart
automatically. The behaviour can be set via the parameter "Restart behaviour"
(C15300/1/2).
In the case of an automatic restart, you must provide external measures which
ensure that the drive only restarts after an acknowledgement (EN 60204).
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Danger!
When the "safe torque off" (STO) function is used, an "emergency
switching−off" according to EN 60204 is not possible without additional
measures. There is no electrical isolation, no service switch or repair switch
between motor and controller!
Emergency switching−off" requires an electrical isolation, e.g. by a central
mains contactor!
During operation
After the installation is completed, the operator must check the wiring of the safety
function.
The functional test must be repeated at regular intervals. The time intervals to be selected
depend on the application, the entire system and the corresponding risk analysis. The
inspection interval should not exceed one year.
Residual hazards
In case of a short−circuit of two power transistors a residual movement of the motor of up
to 180 °/number of pole pairs may occur! (Example: 4−pole motor
Þ residual movement
max. 180 °/2 = 90 °)
This residual movement must be considered in the risk analysis, e.g. safe torque off for
main spindle drives.