Simex SWE-N55L, User Manual

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User manual - METER SWE-N55L
6.3.1. One threshold mode
Figure 6.5 presents the principle of relay output operation for one threshold mode and an
example values of other parameters.
Description:
A, B, C, D - points where measured signal exceeds border values (expected value ± allowed deviation)
tA , tB , tC , tD - time periods while input signal is in zone A or zone B
Figure 6.5. Principle of LED/relay output operation for one threshold mode
Parameter “SEtP” sets a threshold of the relay, and parameter “HYSt” sets
a hysteresis of the relay (figure 6.5 a). The relay can change his state only when input value
exceeds (over or under)
border value
.
Border values
means values equal
threshold + hysteresis and threshold - hysteresis respectively.
The relay state will be changed
as soon
as input value exceeds any of the
border values
(see points A and C, figure 6.5 a, b, c)
but only if at least 4 seconds elapsed
since last change of the relay state. In the other case relay state will be changed after required
delay (4 sec) if the condition of changing the relay still is fulfilled.
The state of relay output while the input value exceeds the
border values
(points A, B, C,
D) is described by parameter “modE”. The relay can be turned on ( “modE” = “on” ), or
turned off ( “modE” = “oFF” ) when input signal value enters the zone A (figure 6.6 a).
The parameter “AL” allow user to set the relay output behaviour in critical situations (e.g.
input values exceeds permissible measurement range ) . User can select that the relay will be
turned on, turned off or not changed in critical situations.
All parameters connected with relay outputs are described in paragraph
“rEL” menu .
13
“SEtP” parameter
(expected signal value)
“HYSt” parameter
(allowed signal
deviation)
measured
signal displayed value
time
time
A
B
C D
relay state
( modE = on )
t
A
t
B
t
C
t
D
B
ON
D
OFF
relay state
( modE = oFF )
B
OFF
D
ON
time
closed
open
a)
b)
c)
open
closed
zone A
zone B