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Construction and Operation
5 --- 18
5.5
QUADRO Control
1
Full load
Standstill
Mo
to
r
p
o
w
e
r
P
re
ssu
re
p
max
p
min
t
p
rise
t
p
decay
Running period
Idle/
standstill period
Run ---on period
1
1
1
1
Time
Stop point for the running period or idle / standstill period
1
3
2
2
4
p
max
upper switching point
p
min
lower switching point
t
p
rise
pressure rise time (the time during which the air system pressure rises
from the lower to the upper switching point)
t
p
decay
pressure decay time (the time during which the air system pressure decays
from the upper to the lower switching point)
4
5
1
1
Idle
Functional description
Two fixed periods --- the running period and idle/standstill period --- are taken as the crit-
erium for selection of the operating mode of the compressor package when the air mains
pressure reaches the upper switching point. These two periods are set according to the
maximum permissible cut ---in frequency of the compressor motor.
The running period starts every time the compressor package is switched on. It lasts as
long as the compressor motor runs and stops when the compressor package switches to
full stop.
The idle/standstill period starts every time the operating mode changes from full load to off
load running. It runs during idle and also when the compressor package is switched to
standstill after the idle period. It stops when the compressor package switches to full load.
Every switching off point is delayed by the run ---on period, during which time the com-
pressor package vents.
The following switching cycles are possible:
-
If the air systems pressure decays to the lower switching point, the compressor pack-
age switches to full load (1) irrespective of its previous operating mode. If the com-
pressor motor was at a standstill the opening of the inlet valve is delayed to allow an
unloaded compressor package start.
Содержание SK 19
Страница 10: ...Technical Specification 1 6 ...
Страница 19: ...Construction and Operation 5 15 ...
Страница 20: ...Construction and Operation 5 16 ...
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Страница 81: ...Appendix 11 77 11 2 Spare Parts List ...
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