LF 170 Operation
103
ba54104e09 11/2010
Example:
Monitoring of limit
values with one or two
relays
Fig. 4-2 Switching points of relays working as limit indicators
The selected limit value (UL/LL) is exceeded/undercut.
The hysteresis HS that was set for the limit value is exceeded/
undercut. The switching delay td for the limit value is started.
If the limit value including the hysteresis is still exceeded/
undercut and the switching delay for the limit value has expired
the relay switches.
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