Engineering manual - UniSAB III 1.10.8
54/346
001930 en 2021.06
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 discharge pres-
sure overload has been measured continually. This pressure level exceeds the alarm limit for high dis-
charge 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 disappear with-
in 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, S 50, S 70, S 93)
The reason for the shutdown is that the differential pressure (P3-P4) 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 pressure
).
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 shut-
down surveillance of the differential pressure across the oil pump.
2.2.12
Full flow pump error (screw compressors)
The reason for the shutdown is that feedback of the full flow pump motor is not set/does not disappear
within the time set in the
Full fl. Pump motor
timer when the motor starts/stops (i.e. the digital output
full
flow 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.
2.2.13
Cooling fan error
The shutdown is activated when feedback from the electrical cooling fan motor is not set/does not disap-
pear within the time limit set in the
Full fl. Pump motor
timer when the motor starts/stops (i.e. the digital
output
cooling fan
is activated/deactivated) or that feedback from the motor disappears even briefly dur-
ing operation.
2.2.14
Oil rectifier error
The reason for the shutdown is that suction gas superheat has not exceeded the value set in
Set point 1
before the
Rect. Disable.
timer has expired although the
Oil rectifier configuration
has been set and the
compressor is running.
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