User manual - RATEMETER STI-94
If t
A
,t
B
,t
C
or t
D
(when input signal stay in
zone A
or
zone B
) are lower than parameters
“t on”
or
“t oFF”
, the relay will not change his state (see points A and C, Figure
6.4 a, d, e
).
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 is contained in
zone 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 relays
will be turned on, turned off,or not changed in critical situations.
All parameters connected with relay outputs are described in paragraph
”rELAy1” menu
.
6.3.2.
Two thresholds mode
Description:
A, B, C, D, E
- points where measured signal exceeds border values (expected value ± allowed deviation)
B
ON
,
B
OFF
,
C
ON
,
C
OFF
,
E
ON
,
E
OFF
- relays state changes moments: (for
“t on”
> 0,
“t oFF”
> 0)
t
A
,
t
B
,
t
C
,
t
D
,
t
E
-
time periods while input signal is in zone A or zone B
Figure 6.5. Principle of LED/relay output operation for two thresholds mode
23
open
closed
E
OFF
“SEt P”
or
“SEt P2”
(
“SEt2”
)
parameter
“HYSt”
parameter
measured
signal
displayed value
time
time
time
A
B
C
D
relay state
(
modE
=
in
t on
= 0
t oFF
= 0)
relay state
(
modE
=
in
t on
> 0
t oFF
> 0)
t
A
t
C
t
D
B
ON
relay state
(
modE
=
out
t on
= 0
t oFF
= 0)
relay state
(
modE
=
out
t on
> 0
t oFF
> 0)
“t oFF”
parameter
“t on”
parameter
B
OFF
E
ON
time
time
open
a)
b)
c)
d)
e)
closed
open
open
closed
“t on”
parameter
“t oFF”
parameter
zone A
zone B
“HYSt”
parameter
zone B
C
OFF
C
ON
E
“t on”
parameter
“t oFF”
parameter
t
B
t
E
closed
