Engineering manual - UniSAB III 1.10.8
001930 en 2021.06
53/346
For SAB 80/GSV-RWF/SAB 120-151, SAB 193-355, SAB 193 H-355 H, SAB 157 HR and SAB 273 S,
this is an
oil separator level
shutdown.
For SAB 109-159 this is an
oil separator level
shutdown.
2.2.3
Capacity error (screw compressors)
This shutdown/alarm is not active for SABflex and SABCube compressors (SAB 109
→
→
159)
The reason for the shutdown is one of the following:
•
The capacity slide is not below 5% within the time set in the timer
Slide max.
at compressor
stop.
•
During operation, the slide has not moved within 20 minutes, although the regulator should regu-
late up or down, and the output signal from the regulator is above 10%.
•
In connection with automatic setting of variable zero point, the slide cannot reach the position
corresponding to calculated or adjusted zero point (i.e. positive read capacity) before the expiry
of the timer
Capacity negative
.
Additional description
1.
If the compressor is in operation and set at
Manual
or
Auto
and the slide does not react to the
regulating signal within 30 minutes, an alarm will be issued. The compressor does not stop.
2.
If the compressor is in operation and set at
Remote
and the slide does not react to the regulating
signal within 30 minutes, a shutdown will be issued. The compressor will stop.
3.
If the compressor is remote controlled by a PC/PLC-system, an alarm will be issued as well.
Monitoring is possible by means of a 4-20 mA signal in the aux. input or via communication.
The reason for the difference between situation 1) and 2) is: If the system runs in sequence -
Remote
(Multisab), the compressor must be stopped in order to start any subsequent compressors in the
sequence.
When a compressor is remote controlled (3) it is not a part of the sequence, remote (Multisab) system.
Thus stopping this compressor will
not
start up subsequent compressors.
2.2.4
PMS error
When UniSAB III wants to start the compressor, the
Start request (PMS)
output is set at ON. The input
Start request OK
must then be set at ON within the time set in the timer
PMS feedback
. If not, the shut-
down will be activated.
2.2.5
No starting permission
The reason for the alarm is that the regulator in
Remote
/Multisab cannot start up the compressor, 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
External 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 dur-
ing operation.
The shutdown may also occur at compressor start if the emergency stop or an optional high-pressure
control has been activated.
Summary of Contents for SABROE Unisab III Control
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