User manual - FLOW METER SPI-638
Figure 6.6 presents the principle of relay outputs operation for two thresholds mode, and
an example values of other parameters. In this mode parameter
“SEt P2”
is accessible in
common with
“SEt P2”
, this parameter describes a second threshold of the relay output. The
parameters
“HYSt”
,
“modE”
,
“t on”
,
“t oFF”
,
“unit”
and
“ALArmS”
are connected with both
“SEt P”
and
“SEt P2”
thresholds. While the controlling process, the relay output changes his
state depends of both
“SEt P”
and
“SEt P2”
thresholds in similar way as it was described in
one threshold mode.
If two threshold mode is used,
“modE”
parameter defines state of the relay output when
the input value occurs in a particular zone defined by
border values
of both
thresholds
. The
relay can be turned on if the input value is contained in
zone A
(
“modE”
=
”in”
) or
zone B
(
“modE”
=
”out”
) and turned off if it is contained in the second one
(Figure 6.6).
The sequence of thresholds
“SEt P”
and
“SEt P2”
can be
set in any order, due to the
control of relay outputs is done depend on difference between thresholds values
(
zone A
) and outside of threshold values (
zone B
).
6.3.3.
Batcher mode and „PrE r1” mode
To switch the device into a batcher mode in submenu
„rELay1”
user should set
„SourCE”
=
„bAt”
. There are following parameters related to
R1
in this mode:
“SourCE”
,
“SEt P”
,
“b PrEC”
,
“b unit”
and
“ALArmS”
. Parameters
“SEt P”
,
“b PrEC”
,
“b unit”
define
quantity of batched medium, displaying precision and the unit respectively. Parameter
“ALArmS”
allows to set behaviour of relay output in critical situations.
Pressing
[ENTER]
button while device is in batcher mode causes start of batching and
set of relay
R1
. Successive pressings of
[ENTER]
button cause pause/restart of batching and
switching
R1
relay off/on. When
batcher counter
reaches value equal to
“SEt P”
then relay
R1
is switched off.
If
batcher counter
is overloaded then its maximal value is displayed alternatively
with
“bAt ov”
message. Overload of this counter do not change state of relays.
To start another pouring cycle,
batcher counter
must be cleared and next new cycle initiated
by pressing
[ENTER]
button.
Batcher counter
can be zeroed using
“CLrbAt”
option of
“bAtCH”
submenu, using
button (press and hold by at least 2 sec.), electrically via
batcher clearing input
or via RS-485 interface by writing of value 0000h to any of batcher
counter result registers. After zeroing of
batcher counter
, currently realized pouring is
stopped and relays switched off.
Zeroing electrically via
batcher clearing input
causes start of the next batching
automatically. In other cases to start of the next batching it is required to use
[ENTER]
button or write of value 0001h to any of batcher counter result registers
using RS-485 interface. To stop batching it is required to use
[ENTER]
button or
write of value 0002h to any of batcher counter result registers using RS-485
interface.
Due to delays while closing/opening the valves decreasing of
“SEt P”
parameter (defining
volume of batched medium) can be necessary. Fact that zeroing of the
batcher counter
using
stops the batching process and switches off the relays can be used for calculating desired
value of
“SEt P”
. Note, that if relay which is controlled by
batcher counter
is used for driving
the valve, then value counted after zeroing of the
batcher counter
tells how much of medium
flows through valve during closing.
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