User manual - WEIGHT METER SWI-94
6.3.1.
One threshold mode
presents the principle of relay outputs 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)
B
ON
,
B
OFF
,
D
ON
,
D
OFF
- relays state changes moments: (for
“t on”
> 0,
“t oFF”
> 0)
t
A
,
t
B
,
t
C
,
t
D
-
time periods while input signal is in zone A or zone B
Figure 6.4.
Principle of LED/relay output operation for one threshold mode
“SEt P”
parameter sets a
threshold
of the relay, and parameter
“HYSt”
sets a
hysteresis
of the relay (graph: a). The relay can change his state when input value is equal
to or greater than (over or under)
border value
(means values equal to
threshold
+
hysteresis
and
threshold
-
hysteresis
respectively) and
t
A
,t
B
,t
C
,t
D
times
are
bigger than the time defined by parameters
“t on”
,
“t oFF”
and
“unit”
. If
“t on”
and
“t oFF”
parameters
are set to “0”, then the relay state will be changed
as soon
as input value
exceeds any of the
border values
(see points A and C, graphs: a, b, c).
If values of
“t on”
or/and
“t oFF”
are positive, then relay state will be turned on if the
input value is equal to or greater than the
border values
and stays like that during at least
“t on”
(see points B
ON
, D
ON
, graph a, d, e). Similarly, the relay will be turned off if time
“t oFF”
elapse since the input signal value is equal to or greater than the
border values
(see
points B
OFF
, D
OFF
, graph: a, d, e).
25
“SEt P”
parameter
(expected signal value)
“HYSt”
parameter
(allowed signal
deviation)
measured
signal
displayed value
time
time
time
A
B
C
D
relay state
(
modE
=
on
t on
= 0
t oFF
= 0)
relay state
(
modE
=
on
t on
> 0
t oFF
> 0)
t
A
t
B
t
C
t
D
B
ON
D
OFF
relay state
(
modE
=
oFF
t on
= 0
t oFF
= 0)
relay state
(
modE
=
oFF
t on
> 0
t oFF
> 0)
“t oFF”
parameter
“t on”
parameter
B
OFF
D
ON
time
time
closed
open
a)
b)
c)
d)
e)
open
closed
open
open
closed
closed
“t on”
parameter
“t oFF”
parameter
zone A
zone B
