Technical data

Fig.6-5: Switch path diagram for normal actuation
Zero position ⇒ x ⇒ enabling ⇒ u ⇒ panic ⇒ v ⇒ zero position
Fig.6-6: Switch path diagram for panic actuation
The enabling switches with the IndraControl VCH 08.1 are designed
as dual circuit switches.
Attaining safety category 3 according to EN 954-1:1996 can be achieved
through realizing the enabling device with 2 circuits.
Safety
category 3 means that a failure does not have to lead to loss of safety
and that an individual failure is detected whenever this can be appropriately
realized.
Predictable Misuse of the Enabling Switch
Impermissible fixing of the enabling switch in the enabling position by using
auxiliary means is considered as foreseeable misuse. Such foreseeable misuse
is to be prevented. The following measures which result in the standstill of the
machine during manual operation are recommended:
● A request of the enabling switch when switching on the machine or the
system and a request of the enabling switch when changing the mode of
operation from automatic to manual (manual operation). (The enabling
switch must not be in the "enabling" position.)
● The enabling switch must be released within a determined period and
must be reset to the "enabling" position. The length of the period must be
chosen in accordance with the operation requirements.
Project Planning Manual | Rexroth IndraControl VCH 08.1 Electric Drives
and Controls
| Bosch Rexroth AG 31/80
Display and Operating Components
Panic Actuation