User manual for meter with U/I input PD72S
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
“toFF”
, the relay will not change his state (see points A and C, Figure 6.6 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
(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 relays will be
turned on, turned off, or not changed in critical situations.
All parameters connected with relay outputs are described in paragraph
“rEL1” 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
,
- relays state changes moments: (for
“t on”
> 0,
“toFF”
> 0)
E
ON
,
E
OFF
t
A
,
t
B
,
t
C
,
t
D
,
t
E
-
time periods while input signal is in zone A or zone B
Figure 6.7. Principle of LED/relay output operation for two thresholds mode
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