Festo DGE-25-ZR-RF Instrucciones De Utilizacion página 40

DGE−...−ZR−RF
Fitting external accessories
Check whether the scanning variants 1 to 3 in the following table are required
S
for your application.
Scan
ning va
riants
Necessity
of
scanning
elements
Mounting
requireme
nts
Fig. 25
Use scanning elements with the following features:
S
Safety
limit
switch
Hardware
limit
switch
Software
limit
switches
Reference
point
switch
Fig. 26
40
1.
The controller requires
a separate reference
point
1 reference point switch
2 hardware limit switches
The ref. point switch must
overlap a hardware limit
switch. The hardware limit
switches must overlap the
safety limit switches.
Design Purpose
Mechanical Implementing the
roller switch EMERGENCY STOP
with switching function
function:
normally−closed
Switching Implementing
function: maximum braking
normally−closed (emergency ramp)
Limiting of the
positioning range by
programming in the
controller
Switching Definition of a
function: reference point for the
normally−open DGE−...−ZR−RF
2.
The controller
does not require a
separate reference
point
Only 2 hardware
limit switches
Hardware limit
switch as reference
point switch over
lapping a safety
limit switch
Remark
In accordance with
accident prevention
regulations
Will only prevent
consequent damage in
the case of programming
faults
Still enables damage−free
braking in the case of
programming faults
Are not usually overrun
Regular checks of the
position are recommended
Festo DGE−...−ZR−RF 0405a English
Additional to 1. and
2. (i
rrespective of the
controller type)
Always 2 safety limit
switches
With safety distance
from mechanical end
position