Handheld Terminal
Connection
User's Manual, Version: 1.3
31
© KEBA 2007
Functional procedure:
z
Only if both channels are activated „simultaneously“ (by pressing one of
the enabling switches) both output relays K2 and K3 will energize and
the output contacts 13-14, 23-24 and 33-34 will close.
z
The output relays K2 and K3 will not energize if
z
only one enabling channel is activated (in case of a defect),
z
the tolerance value for the simultaneity period is exceeded,
z
the feedback control loop S11-S12 is open.
z
If one enabling channel is deactivated after being simultaneously acti-
vated (by releasing the enabling switch or in case of a defect), the out-
put relays K2 and K3 will return to their initial position again.
The forced-guided output contacts 13-14 and 23-24 will open. The out-
put relays will energize again only after both enabling channels have
been deactivated and simultaneously activated once again.
In this way the enabling switches avoid that one single error makes the
safety function inoperational. A single error will be recognized at the next
cycle at the latest.