KEB COMBIVERT F5, Руководство по установке

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GB - 18
Safety Function STO
Characteristic data for „Safe torque off“
• Used when monitoring of standstill is not necessary
•
Unintentional starting of the motor is prevented
• No galvanic isolation of the motor from the inverter DC link
What is realized by the STO function related to EN 60204 ?
Emergency stop can be realized by the STO function, since the mains voltage may remain
effective.
Emergency stop can be realized only in connection with a line contactor, which disconnects
the mains voltage !
3.1 Emergency stop according EN 60204
By using suitable safety switchgear units, stop category 0 and 1 according to EN 60204 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
braking 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.
Restart only
after confir -
mation
The drive restarts if function STO is no longer released. In order
to comply with EN 60204, it must be ensured by external mea -
sures that the drive restarts only after confirmation.
Without mechanical brake the drive leads to coast; motor is free-wheeling. Additional pro -
tective devices must be installed (e.g.locking systems) if damage to persons or property can
occur.
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.
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 selec-
ted drive and the gear ratio.
Calculation of the jerk:
Rotation angle of the jerk W
R
[°] =
180°
–––––––––––––––––––––––––––––––––
Pole-pair number p • gear reduction ratio g
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 re -
mains in STO status.