Safety Stop Category 3 28 En954-1 - KEB COMBIVERT F5 Betriebsanleitung

4.3 Safety Stop Catego-
ry 3 EN954-1
30
With the function „safety stop" one of the following conditions must be fulfilled:
- the power supply to the drive must be interrupted (double security).
- no torque at the drive
The KEB COMBIVERT fulfills the condition no torque with a safe disconnection
for the phase sequence formation necessary driver signals of the power modules
(IGBT). No voltage disconnection takes place.
This is guaranteed by a two-channel processing holding signal. On of the two
channels is developed in programmed electronics. The second channel consists
of an electro-mechanical relay. The function of the relay is cyclically monitored by
programmed electronics.
Through the safety no further measure is needed for the KEB COMBIVERT
(e.g. feedback via relay contact) since an individual error in the control does
not lead to the loss of the stop function.