User manual - METER PDU-4x0-W
Parameter
“SEtP”
sets a
threshold
of the relay, and parameter
“HYSt”
sets a
hysteresis
of the relay (Figure 6.6 a). The relay can change his state
only
when input value
exceeds (over or under)
border value
and
t
A
,t
B
,t
C
,t
D
times
(
Figure 6.6
) are bigger than the
time defined by parameters
“t on”
,
“toFF”
and
“unit”
.
Border values
means values equal
threshold
+
hysteresis
and
threshold
-
hysteresis
respectively.
If
“t on”
and
“toFF”
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, Figure 6.6 a,
b, c).
If values of
“t on”
or/and
“toFF”
are positive, then relay state will be turned on if the
input value exceeds the
border values
and stay bigger (or lower) during at least
“t on”
(see points B
ON
, D
ON
, Figure 6.6 a, d, e). Similarly, the relay will be turned off if time
“toFF”
elapse since the input signal value exceeds any of the
border values
(see points
B
OFF
, D
OFF
, Figure 6.6 a, d, e).
If
tA ,tB ,tC or tD
(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
.
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