Operation Manual
FT128 Rev 2.4
126
27.4 Acknowledge SERVICE Signal (H8/S4)
When SERVICE signal is generated in the system, it is indicated by LED "Service" (L12),
which will be turned off when all sensors have been acknowledged.
See chapter "Sensors activating SERVICE signal (H4/U4)", page 105.
Only 430x, 4400 and 4401 sensors in NORMAL mode have to be acknowledged: When
service signal from such a sensor is acknowledged, the sensor is given a default week
average sensor value (same as for a new / clean sensor = 0.1 %/m). First replace the
sensor and then acknowledge the service signal as soon as possible. The first week
average sensor value after acknowledge will be calculated within one hour, then each
week.
Sensors 4400, and 4401 set in advanced mode do not have to be acknowledged if they
are replaced after generating service signal. They will be automatically reset.
Note: If a sensor 430x, 4400 and 4401 in NORMAL mode is replaced without having
generated service signal, it has to be reset to the default week average sensor value via
menu RESTORE WEEKLY AVERAGE TO DEFAULT (H8/S5).
The very first week average sensor value after the SERVICE signal is acknowledged will
be calculated within one hour. Thereafter a new week average sensor value will be
calculated every week.
If there are no sensors having activated SERVICE signal, --- List is empty --- will be shown.
Action Text in display Comments
"Access" Log on to FT128 as shown
in page 35.
Scroll to menu H8.
Maintenance
ACCEPT? H8
"A"
Disconnect / Re-connect COM loop
ACCEPT? S1
Scroll to menu S4. Acknowledge SERVICE signal
ACCEPT? S4
"A" Sensor : xx-xx (technical address xxx)
needs service L
L = a list in which you can
scroll. Press "Fault
acknowledge" to
acknowledge the service
signal or press "Return"
to S4.
"Fault acknowledge" The service signal for that sensor is now
acknowledged and the next sensor will be shown in the
display.
If more service signal
acknowledgements shall
be done, continue like
above. If not, press
"Return" to menu S4.
Sensor : yy-yy (technical address yyy)
needs service L
"Return"
Acknowledge SERVICE signal
ACCEPT? S4
Scroll or press "Return" to
menu H8.
"Return" Maintenance
ACCEPT? H8
Scroll or press "Return".
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