29
©
Dinel, s.r.o. PDU–4xx–W
If values of “t on” or/and “toFF” are positive, then relay state will be turned on if the input value ex-
ceeds the border values and stay bigger (or lower) during at least “t on” (see points B
ON
, D
ON
, Fig.
19 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
, Fig. 19. 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 a C, Fig. 19 a, d, e). The state of relay out-
put 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 19 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.
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,
“toFF”
> 0)
tA , tB , tC , tD
time periods while input signal is in zone A or zone B
Fig 19: Principle of LED / relay output operation for one threshold mode
Displayed
value
zone A
zone B
closed
closed
time
time
time
time
time
open
open
open
open
closed
closed
"toFF"
parameter
"toFF"
parameter
"t on"
parameter
"t on"
parameter
measured
signal
"SEtP"
parameter
(expected signal value)
"HYSt"
parameter
(allowed signal
deviation)
relay state
(
modE
=
on
t on
= 0
toFF
= 0)
relay state
(
modE
=
oFF
t on
= 0
toFF
= 0)
relay state
(
modE
=
on
t on
= 0
toFF
= 0)
relay state
(
modE
=
oFF
t on
= 0
toFF
= 0)
