3.2.1 Emergency stop according EN 60204
By using suitable safety switchgear units, stop category 0 and 1 according to EN 60204 -1 can be
reached by the STO function in the system. Note chapter 6 for safety switchgear units.
Stop category 0
„uncontrolled stop“, i.e. stop by immediate removal of power to the
actuators.
Stop category 1
„controlled stop“, i.e. power to the actuators is retained to apply brak-
ing until the stop is achieved. The energy is switched off at standstill.
Emergency stop to EN 60204 must be functional in all operating modes of the drive module. The
reset of emergency stop may not lead to an uncontrolled start of the drive.
Attention
The drive restarts if function STO is no longer released. In order to com-
ply with EN 60204-1 , it must be ensured by external measures that the
driverestartsonlyafterconrmation.
Withoutmechanicalbrakethedriveleadstocoast;motorisfree-wheeling.Additionalprotectivede-
vices must be installed (e.g.locking systems) if damage to persons or property can occur.
Danger
Ensure coast of the motor
If danger to persons occur after switching off the motor control by STO,
the entrance to hazard areas must remain closed until the drive stops.
Attention
Jerks in error case
In case of double malfunction it can lead to unwanted jerk, the rotation
angle is depending on the number of poles of the selected drive and the
gear ratio.
3.2.1.1 Calculation of the rotation angle triggered by the jerk
Rotation angle of the jerk WR [°] =
180°
–––––––––––––––––––––––––––––––––
Pole-pair number p • gear reduction ratio g
Table 2: Calculation of the jerk
The probability of the jerk is < 1.84 *10
-15
1/h.
This behaviour can occur either by a short circuit of the IGBTs or by interconnection (also short circuit)
of the control drivers. The error should be regarded as critical, if the drive remains in STO status.
18
SAFETY FUNCTIONS
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