Technical data

switch position. Releasing or firmly pushing through the actuator leads to the
stopping
of dangerous movements. When moving back from the pushed posi‐
tion to the inactivated position, no enabling signal is emitted.
As an additional safety operating element, the hand-held terminal IndraControl
VCH 08.1 includes a STOP push button which is also designed as a dual circuit
element. The switch contacts are directly guided outwards above the connect‐
ing cables and can be connected via the IndraControl VAC 30.2. It is possible
to interrupt the operation of the system in all operating modes using the STOP
push button (STOP category 0).
Enabling Function
The IndraControl VCH 08.1 includes two enabling switches which are located
on both sides of the device. This means that operation using either the left or
the right hand is possible. The two enabling switches are parallel connected
and have an equal effect on the shared safety circuits in the connection cable.
Only one of the two switches must be actuated.
The enabling switch consists of a 3-stage operating element and separate
evaluation electronics. One essential feature is the consistent dual circuit de‐
sign, beginning at the actuation elements and continuing to the connection
clips. The evaluation circuits have been realized with different technologies and
circuits. Subject to observance of the nominal values (ohmic, inductive and ca‐
pacitive), the electronic switching contacts are wear-free.
The switching elements of the enabling switch are designed with reverse-volt‐
age protection. The outputs of the two circuits are protected against short
circuiting and overloading:
circuit 1: thermally protective circuit
circuit 2: fold back characteristic
The actuation element consists of two symmetrically arranged rocker switches,
the position of which can be detected and transmitted to the evaluation elec‐
tronics using electric buttons.
The enabling switch can assume three different switch positions:
Switch position
Function Enabling switch Switching contact
1 zero position is not confirmed off (open)
2 enabling is confirmed on (closed)
3 panic is extruded off (open)
Fig.6-4: Switching positions of the enabling switch
Zero position ⇒ x ⇒ enabling ⇒ y ⇒ zero position
30/80 Bosch Rexroth AG | Electric Drives
and Controls
Rexroth IndraControl VCH 08.1 | Project Planning Manual
Display and Operating Components
Operating Principle
Normal Actuation