Engineering manual - UniSAB III 1.10.8
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001930 en 2021.06
Alarms and shutdowns
2. Alarms and shutdowns
2.1 Analogue alarms and shutdowns
2.1.1 Introduction
Shutdown and alarm limits can be set separately as described in subsection 1.2.6 Changing set values.
UniSAB III does not check whether shutdown and alarm limits have been interchanged by mistake (e.g.
if alarm limit for high discharge pressure is set higher than the shutdown limit). Consequently, always
check the settings when making adjustments. If an alarm limit is exceeded, the light diode above the
key will flash yellow quickly, and the alarm relay will be activated. The reason for the alarm is shown
in the Alarm picture. If there is more than one alarm this is indicated in the top bar.
Note that in case of alarm, a limiter might be active as described in section 3.2 Limiting functions. When
the alarm disappears, it is automatically acknowledged and removed from the Alarm picture and the
alarm relay returns to its normal position.
If a shutdown limit is exceeded, the compressor immediately stops and the light diode above the
key flashes red quickly. The Shutdown picture shows the reason for the shutdown and at the same time
the shutdown relay changes its position.
The shutdown relay works by connecting the shutdown/common switch during shutdown and discon-
necting it once the shutdown has been reset. The Shutdown picture shows the exact time of the shut-
down. See also 5.2 Diagnosis. To reset the shutdown, press the /RESET key. The alarm and
shutdown relays will then return to their normal positions. However, if the shutdown value is still outside
the limit, the light diode will continue to flash red, but slowly. When the situation has returned to normal,
the /RESET key must be pressed once more.
The set values for high and low shutdowns as well as the factory values are stated in the following tables
(Table 9-Table 16) followed by explanatory notes.
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