2.2.5 No starting permission
The reason for the alarm is that the regulator in Remote/Multisab cannot start up the com-
pressor, even though the regulator demands more capacity and the compressor is next in line
to start. The reason is that Auto start has not been configured to Yes, or that the input Exter-
nal starting permission – normal stop is not ON.
2.2.6 Compressor motor error
The reason for the shutdown is that feedback from the motor is not set/does not disappear
within the time set in the Motor start timer when the compressor motor is started/stopped
(i.e. the digital output compressor start is activated/deactivated) or that feedback from the
motor disappears even briefly during operation.
The shutdown may also occur at compressor start if the emergency stop or an optional high
pressure control has been activated.
2.2.7 Compressor motor overload
The reason for the shutdown is that within the time set in the Current overload timer, a motor
current has been measured continually. This current exceeds the actual set point value set for
Motor current in Set point 1 or Set point 2.
2.2.8 Discharge pressure overload
The reason for the shutdown is that within the time set in the Discharge overload timer, a dis-
charge pressure overload has been measured continually. This pressure level exceeds the
alarm limit for high discharge pressure.
2.2.9 High motor temperature
The reason for the shutdown is that the Thermistor input is open, i.e. the load on the input is
above 3990 Ω.
2.2.10 Oil pump error (screw compressors)
The reason for the shutdown is that feedback from the oil pump motor is not set/does not dis-
appear within the time set in the Oil pump motor timer when the compressor starts/stops (i.e.
the digital output oil pump start is activated/deactivated) or that feedback from the motor
disappears even briefly during operation.
The shutdown functions as an alarm during operation i.e. after the prelubrication sequence
has been completed.
2.2.11 Oil pump error (SAB 80)
The reason for the shutdown is that the differential pressure across the mechanical oil pump
is too low, i.e. lower than 0.5 Bar. This value can be set as Set point 1 for the oil pressure.
The shutdown is delayed 45 seconds after compressor start (same timer as for low oil pres-
sure).
The shutdown is only activated when the discharge pressure is lower than 16 Bar. This value
can be set as Set point 2 for the oil pressure. At a discharge pressure level of approx. 16 Bar,
the pump cannot be expected to generate a positive relative pressure because of the shunt
valve. There is therefore no shutdown surveillance of the differential pressure across the oil
pump.
Alarms and shutdowns
Engineering manual - Unisab III 1.10
001930 en 2014.09
49/319
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