K-Patents DD-23 - Manual (Page 33)

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7.5 Resettable alarm logic
UNACKNOWLEDGED
ALARM
(Blinking, Relay 6 active)
ALARM
(Light on, Relay 6 inactive)
Alarm source active?
ALARM RESET
pressed?
Alarm source active?
yes
no
no
no
yes
yes
NO ALARM
(Light off, Relay 6 inactive)
Figure 7.5 The resettable alarm logic
In order to identify new alarms, there
is a resettable alarm logic in the Di-
vert control unit. There are four pos-
sible alarm sources: SOLIDS ALARM,
SOLIDS WARNING, A&B DIFFERENCE,
and MALFUNCTION. All of these fol-
low the same alarm reset rules (see
Figure 7.5).
When a new (unacknowledged) alarm
activates, the corresponding light starts
blinking in the operator panel, and re-
lay 6 is activated. When the
ALARM RE-
SET button is pressed, relay 6 is inacti-
vated.
The state of the alarm indicator in the
operator panel depends on whether
the cause for the alarm is still present.
If the cause has cleared (e.g. solids
content has risen above the warn-
ing limit), the light goes off when
the
ALARM RESET is pressed. If the
cause has not cleared, the light will be
steadily illuminated.
A non-illuminated light means there
is no alarm.
A steadily illuminated
alarm light means there is a problem
which persists but the problem has
been acknowledged by pressing the
ALARM RESET . A blinking light means
the problem has not been acknowl-
edged, but gives no information whether
the problem is still there or not.