Page 63
Sonic-Pro
Industries, Ltd.
Industries, Ltd.
ProSeries
by Blue-White Ind.
TM
been configured, then at any time the flow falls to or below that value the alarm is
automatically cleared and the relay channel returns to the
CLEAR
state. (This is what
the operator is going to be striving for in the
ALARMING
and
CLEARING
states.) If a
Release
value has not been configured for the
Trigger
value that caused the alarm,
then the relay channel will only follow arrow e back to the
CLEAR
state if the flow falls
back inside the
Trigger
value and the operator presses the
CLEAR
soft button (as first
stated above). A
Release
value that is identical to its corresponding
Trigger
value has
the same effect as if it were not configured (it prevents automatic recovery from that
direction).
The
Alarm Delay Time
cannot be configured to a value greater than 3600 (one hour). If
the
Alarm Delay Time
is configured to zero, it is effectively disabled and displays as
NONE.
Any
Trigger
or
Release
value that is set to zero is effectively disabled and displays as
NONE.
This includes the
Low Trigger
, so if the user wishes to alarm on zero flow, he
must set the
Low Trigger
to a very small, but non-zero, flow value. Disabling a
Trigger
value causes the corresponding release value to be also disabled. If a
Release
value is
disabled, or set to the same value as the corresponding
Trigger,
then the flowmeter will
not automatically release an alarm caused by that trigger (the
CLEAR
soft button must
be pressed to release the alarm).
The
CLEAR
soft button appears on the screen in the
ALARMING
state and also in the
ALARMED
state if an
Alarm Delay Time
has been set or if no
Release
value has been
set for the
Trigger
that caused the alarm.
If the
CLEAR
soft button
in the
ALARMING
state, the countdown of
the
Alarm Delay Time
will re-start, providing extra time to correct the problem.
ALARMED
state and when an
Alarm
Delay Time
has been set, then the relay will de-activate, the
Status:
display will read
CLEARING
in white-on-black and the
CLEAR
soft button will disappear. The intent is
that the operator now goes and fixes whatever caused the flow to go out of bounds. If the
flow falls within the
Release
limits before the alarm delay time expires, then the
Status:
display will read
CLEAR
and the relay will remain de-activated. If the number
of seconds set in the
Alarm Delay Time:
field passes after the
CLEAR
soft button is
pressed and the flow rate is still outside of the
Release
limits, then the relay re-
activates, the
Status:
display will read
ALARMED
and everything will be as it was
before the soft button was pressed.
ALARMED
state and when no
Alarm
Delay Time
has been set and no
Release
value has been set for the
Trigger
that
caused the alarm, then what happens depends on whether the flow has fallen back inside
the
Trigger
value. If it has, the alarm will be cleared. If it hasn’t then nothing will
happen.
None of the settings of a relay channel configured to monitor Flow Rate can be changed
from the Process Control screen. The , and
EDIT
soft buttons do
not appear.
is pressed when
If the
CLEAR
soft button is pressed when in the
If the
CLEAR
soft button is pressed when in the
8.3.2
Clearing
Alarms
8.3.3
Editing
Alarms
Ç
È
