Classification From Sto To Iec 61508; Classification From Sto To En Iso 13849; Functional Description; Table 26 Technical Data Of The Sto Function - KEB COMBIVERT F6 Instructions For Use Manual

DANGER
ma_dr_f6-cu-k-inst-20144795_en
Jerking of the drive in the event of a fault
Danger to persons
ü 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.
a) Switch off the supply voltage before carrying out any work on the machine.
b) Await capacitor discharge time (min. 5 minutes). Measure DC voltage at the
terminals.
Calculation of the jerk:
Angle of rotation of the jerk Wr = 180°/ (number of pole pairs x gear reduction ratio)
The probability of a jerk is < 1.84-10
short circuit of the IGBTs. The error is only to be considered critical if the drive re-
mains in the STO state.

9.3 Classification from STO to IEC 61508

PFH
PFD
Proof test interval
For the SIL classification in connection with the applications, the failure rates of the
external switching devices must be considered for the final assessment.

9.4 Classification from STO to EN ISO 13849

Control category
MTTF
D
DC value
For the classification within a performance level in connection with the applications,
the failure rates of the external switching devices must be considered for the final
assessment.

9.5 Functional description

The COMBIVERT with integrated safety technology fulfils the following function ac-
cording to EN 61800-5-2:
The safety-oriented shutdown according to STO is achieved by a two-channel
opto-coupler lock. The supply of the optocouplers, which are responsible for the
commutation of the connected drive, is done by a transformer coupling of the input
voltage. This ensures that the optocouplers cannot be supplied if the input voltage
is lost. If the optocouplers are no longer supplied, no IGBT can be controlled and
thus no energy can be supplied to the drive.
The dual-channel capability is achieved by using input STO1 to suppress the sup-
ply voltage (VTRO) of the upper optocouplers of the inverter bridge and input
STO2 to suppress the supply voltage of the lower optocouplers (VTRU).
Maximum switch-on delay (UIN=15V)
Maximum switch-off delay (UIN=30 V) at
active modulation
Maximum switch-off delay (UIN=30 V) at
inactive modulation until safe state of the
driver voltage is reached.
Table 26: Technical data of the STO function
Safety function STO | 9
-15
1/h. This behaviour can be caused by a
-12
4.04 • 10 1/h
-7
3.54205 • 10 per request
20 years
4
>2500 years
high
7 ms
10 ms
50 ms
41