Handheld Terminal Connection
User's Manual, version: 3.1 / material no.: 57448 23
© KEBA 2006
Panic
The pushing of the actuating elements into the panic position is evaluated
in a way that the enabling position is skipped when the actuating elements
are released.
Home position
x
enabling
u
panic
v
home position
12 3
x
u
v
OFF
ON
OFF
ZT
x
ZT
x
Circuit 1
Circuit 2
Circuit 1
Circuit 2
OFF
ON
OFF
OFF OFF OFF
OFF OFF OFF
123
123
ZT
x1
ZT
x2
Circuit 1Circuit 2
Evaluation
electronics
Enabling
switch
x ... L (Left) or R (Right)
Contact travel diagram for panic
Notice
• At the KeTop, the enabling switches always feature two circuits.
To meet the safety category 3 in accordance with EN 954-1:1996, the ena-
bling switch must be realized with 2 circuits.
The safety category 3 means, that one failure must not lead to the loss of
the safety function, and whenever possible, the single failure is detected.
The chapters „
Example of Connection with PILZ PST1 Control Relay“ and
“
Example of Connection with ELAN SRB-NA-R-C.27/S1 Control Relay”
show how the safety category 3 can be fulfilled with the KeTop and its
safety-related parts. The entire concept of the machine must be laid out ac-
cording to the principles of safety category 3.
The monitoring of the simultaneity by the control relay is necessary, be-
cause otherwise maybe a failure culmination would not be recognised and
this would cause the loss of safeness:
If one circuit of the enabling device switches to the enabled state as a result
of a failure and after some time the second circuit also switches to the en-
abled state as a result of an failure, then no de-energisation by the enabling
device would be possible.
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