Function of VS 300
44
Doku-Version 2.05 - Firmware 2.10 - 15. September 2017
4.4.2
Low pressure monitoring
All compressors are unloaded if low pressure drops to a definable limit. When the pressure rises to the level pro
portional to the t
0
setpoint, the compressors are re-loaded progressively as described above. Alarm is generated
after a delay has elapsed. Delay and priority of the alarm are definable. The alarm limit is entered in
_
C (Param
eter S227 / S267).
ZNR
.
51203
64
9
30
E1
Contro
l
a
l
gorithm LP monitoring
neutra
l z
one (NZ)
t
T
ime
0
Suction
pressure
t
0 Setpoint
LP
-
Limit
Compressor shutdown
A
l
arm is signa
l
ed
Compressor
l
oad
A
l
arm de
l
ay
4.4.3
Monitoring of the t
c
/t
0
difference
If the high pressure falls to a level below the LP setpoint the installation no longer starts. In order to prevent this
a minimal temperature difference between the t
C
actual value and the t
0
setpoint can be programmed. If the dif
ference falls below the defined limit value, the t
0
setpoint is lowered so that the difference is maintained.
This leads to a compressor start-up which generates an increase in the high pressure. If the temperature differ
ence exceeds the defined setpoint, the t
0
setpoint is raised by 1 Kelvin per minute until the setpoint derived from
the t
0
characteristic curve has been reached again.
The temperature difference can be programmed in the menu 3-4
Monitoring CL1/CL2
via the parameter
Min to
diff
. If ”---” is entered then the t
0
lowering is deactivated.
t
Time
ZNR. 51203
8
2
8
30 E2
c Act.
Min. t - t -Diff.
0
t -Subsidence
t
0 Setp.
C
0
1 K/min
t
c min.
The function can only be activated when CL1 is parameterised as low pressure circuit (NT1 or LT1)
and CL2 as high pressure circuit (HP) (see chapter 5.3.2.4 - Configuring the controller).
Содержание VS 300
Страница 8: ...vi Doku Version 2 05 Firmware 2 10 15 September 2017 Notice ...
Страница 18: ...System Design of VS 300 10 Doku Version 2 05 Firmware 2 10 15 September 2017 Notice ...
Страница 22: ...Application of VS 300 14 Doku Version 2 05 Firmware 2 10 15 September 2017 Notice ...
Страница 158: ...Parameter List and Menu Structure of VS 300 150 Doku Version 2 05 Firmware 2 10 15 September 2017 Notice ...
Страница 160: ...Decommissioning and disposal 152 Doku Version 2 05 Firmware 2 10 15 September 2017 Notice ...
Страница 166: ...Alarms and Messages of VS 300 158 Doku Version 2 05 Firmware 2 10 15 September 2017 Notice ...
Страница 170: ...162 Doku Version 2 05 Firmware 2 10 15 September 2017 Notice ...
Страница 172: ...Order No s and accessories of VS 300 164 Doku Version 2 05 Firmware 2 10 15 September 2017 Notice ...