Engineering manual - UniSAB III 1.10.8
214/346
001930 en 2021.06
Set point 1
is the pressure at which the pump will start and
Set point 2
is the pressure at which the pump
will stop. For more details, see
3. Compressor control and surveillance
.
2: Full flow pump (screw compressors)
No
Yes
Select
Yes
for VMY Mk 3 compressor provided it is fitted with full flow pump.
Select
No
for all other compressor types.
Use pump for prelubrication before start-up and to maintain minimum oil pressure during operation. Re-
member to set
Set points 1
and
2
as they determine the pressure levels where the pump is going to start
and stop. Select picture
Control values/Oil/Pressure/Control
.
Set point 1
is the pressure at which the pump will start. Select 5.5 bar.
Set point 2
is the pressure at which the pump will stop. Select 7.0 bar.
For more details, see
3. Compressor control and surveillance
.
3: Oil cooling
1. None
2. Normal (Screw and reciprocating compr.)
3. HLI/BLI (Screw compressors)
4. Thermo pump (Reciprocating compr.)
5. 3-way-valve (Screw compressor)
6. HLI-AKV (Screw compressor)
7. HLI 4-20mA (Screw compressor)
8. Thermo pump internal (Reciprocating compr.)
None
Oil cooling is disabled.
Normal
Oil cooling output is activated by rising oil temperature. The set point for this value is set in picture
Con-
trol values/Oil/Temperature/Control Set point 1
. The set point has a fixed hysteresis of 5K, i.e. cooling
starts at set point 1 and stops at set point 1 - 5
°
C.
Screw default setting:
Set point 1 = 50
°
C
SMC/CMO default setting:
Set point 1 = 55
°
C
HPC/HPO default setting:
Set point 1 = 65
°
C.
Oil cooling output is closed at compressor stop according to adjustable time delay. In
Timers/Timer set-
up
adjust time delay
Oil cool on
.
HLI/BLI
Oil cooling output is activated by rising discharge temperature. The set point for this value is set in
Con-
trol values/Discharge/Temperature/Control Set point 1
. The set point has a fixed hysteresis of 2K.
Example: Set point 1 = 50
°
C: Cooling starts at 50
°
C and stops at (50-2) = 48
°
C.
Thermo pump
Output for activating thermo pump takes place at compressor start-up. No regulation is connected to this
function.
3-way-V
The 3-way-valve is used to control the three-way motor valve for oil cooling, which is regulated accord-
ing to oil temperature. The set point for this value is set in
Control values/Oil/Temperature/Control
.
Set
point, neutral zone
and
proportional band
can now be set. This regulator is normally not used but can be
used if a valve with motor drive is fitted.
AKV
(Screw compressor)
Summary of Contents for SABROE Unisab III Control
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