User manual - METER SRT-147
7.3.1.
“rEL1” menu
This menu allows to configure the operation mode of relays and LEDs marked „
R
” (e.g. „
R1
”).
If there are few relay outputs available, then every output has its own configuration menu
(e.g. menu „
rEL2
” for relay (LED) „
R2
”). Principle of the relays operation is described in
paragraph
CONTROL OF THE RELAY OUTPUTS
.
•
The relay outputs and LEDs (named
R
) can be controlled depend on both - the
current value and the peak value (when peak detection is active) of the input
signal.
•
If device is not equipped with one or more relay outputs, menus refer to this
relays are available, but apply to LED indicators only. In such case LEDs
indicates exceeding of particular thresholds.
“SEtP”
- first threshold of the relay (range -999 ÷ 9999). Negative values can be input by
selecting a “-” sign on first digit (to change value use
[^]
and
[v]
buttons).
Threshold is the medium value of relay hysteresis.
“SEt2”
- second threshold of the relay (range -999 ÷ 9999). Negative values can be input
by selecting a “-” sign on first digit ( to change value use
[^]
and
[v]
buttons). This
threshold is accessible when
”modE”
parameter is set to
„in”
or
„out”
value.
Threshold is the medium value of relay hysteresis.
“HYSt”
- hysteresis of relay (range 0 ÷ 999). Full hysteresis of the relay is equal to 2x
“HYSt”
parameter. The relay state can change when an input signal is out of
threshold-hysteresis
to
thhysteresis
zone.
Presented parameters should be set to ensure that
”SEtP” + ”HYSt”,
”SEt2” + ”HYSt”, ”SEtP” - ”HYSt”
or
”SEt2” - ”HYSt”
does not exceed the
measure range. Additionally, in two threshold mode (“
modE
”= „
in
” or „
out
”), the
hysteresis for both thresholds must not cover each other (in other case relay can't
change his state).
“modE”
- relay operation mode:
“noAC”
- the relay is not active (permanent turned off)
“on”
- one threshold mode, the relay is turned
ON
when input signal exceeds
SEtP
+
HYSt
value
,
and is turned off back when the input signal became
lower than
SEtP – HYSt
,
“oFF”
- one threshold mode, the relay is turned
OFF
when input signal exceeds
SEtP
+
HYSt
value
,
and is turned on back when the input signal became
lower than
SEtP – HYSt
,
“in”
- two threshold mode, the relay is turned
ON
when the input signal is
bigger than “
lower threshold
+
HYSt
”
and lower than “
bigger
threshold
–
HYSt
”, and turned off when the input signal is contained in
the second zone. The
bigger threshold
means bigger one of
“SEtP”
and
“SEt2”
thresholds, the
lower threshold
” means lower one of
“SEtP”
and
“SEt2”
thresholds.
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