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7.5.2 Limit comparators
Function
LK actual value
LK set value
Action
Time
Limit value (AL)
Switching
differential (Xsd)
Switch-on delay
on segment change
Function for
overrange /
underrange
Limit compara-
lk1
tor functions
IMAGO F3000 / 10.01
Limit comparators (limit monitors, limit contacts) are used to monitor the size
of an input variable (actual value for the comparator) in comparison with a
fixed threshold or another variable (set value for the comparator). If the signal
goes beyond the limit (threshold) a signal can be output or an internal function
can be initiated.
Limit comparators 1 — 8
Selection/settings
No function
lk1 — lk8
(Analog selector)
OFF
Absolute
Relative
0 — 32000sec
-199.0 to 0 to +999.9
0.0 — 1.0 — 999.9
0 — 32000sec
Relay drops out
Relay pulls in
k
/ bold = factory setting
On
lk4
On
lk7
On
w = set value for limit comparator,
AL = limit,
x = actual value for limit comparator,
X
= switching differential
Sd
Description
Switching function of the limit comparator,
see description below
Signal sources for the input variables to the limit
comparator
See description below
Delay time for the "Relative" action
Defines the switching point of the limit comparator
Hysteresis
The time delay when the segment changes
The response if one of the input variables goes
above/below the given range
lk2
On
lk5
On
lk8
On
7 Setup Program
lk3
On
lk6
On
lk1 — lk6:
Monitoring relative to a set
value (setpoint) for the limit
comparator.
lk7/lk8:
Monitoring relative to a fixed
limit AL
71
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