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Visual alarm
indication
Standardized
operational
sequences
8
The state of the alarm channel is indicated by
super-bright LEDs. A legend plate of transpar-
ent film is inserted in a slot at the edge of the also
transparent plastic overlay. For more informa-
tion, see section "Legend plate", page 22.
The first-out indication is accomplished with
the four digit display on the front panel. The
information stored in the event register can also
be displayed on the digital display.
FAULT
ON
Fig. 5. Alarm indicators and push-buttons of the annunciator unit SACO 16D3.
The annunciator unit is supplied with five stand-
ardized field-selectable operational sequence al-
ternatives of which the most adequate one for a
certain application is selected. The operational
sequences are:
0 = ISA A, automatic reset
1 = ISA A-1, automatic reset, separate reset of
audible alarm
2 = ISA M-1, manual reset, separate reset of
audible alarm
3 = ISA R-1, manual reset, separate reset of
audible alarm, visual ringback on return
4 = DIN 19235, manual reset after return to
normal if acknowledged while alert, visual
ringback on return if acknowledged before
return to normal
The above operational sequences are common
to all the 16 channels. However the sequences
can be altered on a per-channel basis according
to the following:
0 = indications according to the selected sequence
1 = indications according to the selected sequence
but including audible alarm also on return.
Valid only for sequences ISA R-1 and DIN
19235
2 = field contact following indication without
audible alarm
Acknowledge and reset is done with a push-
button located on the plastic cover on the front
of the unit or with two external push-button.
The reset indicator LEDs on the front panel
marked SILENCE, ACK, RESET/TEST shows
which of the actions is to be performed. The
reset sequence depends on the operational se-
quences.
Four-digit seven-segment display
Reset indicator LEDs
SILENCE
ACKNOWLEDGE
RESET/TEST
Acknowledge/Reset push-button
Channel window with indicator
LED and legend text
Event register step-by-step
read-out push-button
The acknowledge/reset operations required are
determined by the annunciator unit itself and
the acknowledge/reset operation being asked
for is pointed out with the indicator LED. The
annunciator unit is provided with two external
control inputs, one for remote resetting of the
audible device and an other for remote acknowl-
edge/reset of the alarm channels.
NOTE!
The acknowledge/reset push-button on the front
panel also operates as a visual display test but-
ton. The test is accomplished by pressing the
acknowledge/ reset test button continually for
approximately 1 second which causes all LED
indicators to light up and the digital display to
show 8888. The visual displays can not be tested
if an alarm channel is unacknowledged or not
reset. Pressing the test button for approximately
15 s activates the self-supervision auxiliary out-
put relay and the FAULT LED.
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