Functional Description - KEB COMBIVERT F5 Installationsanleitung

Safety Function STO
3.5

Functional Description

The COMBIVERT with integrated safety function meets the following function according to
IEC 61800-5-2:
• „Safe torque off" (STO)
The safety-related disconnection according to STO is reached by a two-cannel opto-coupler
blockage. The supply of the opto-couplers, which are responsible for the commutation of the
connected drive occurs via transformation coupling of the input voltage. This ensures at input
voltage loss that no supply of the opto-couplers is possible. If the opto-couplers are not longer
supplied, no IGBT can be controlled and thus no energy can be supplied to the drive.
The two channels are reached by way that input STO1 prevents the voltage supply (VTRO)
of the upper opto-couplers of the inverter bridge and input STO2 the lower opto-couplers
(VTRU).
Technical data of the STO function
Maximum ON delay (U
Maximum OFF delay (U
... active modulation
... inactive modulation until safe state of the driver voltage is reached
GB - 20
= 15V)
IN
=30 V) at
IN
7 ms
10 ms
50 ms