7
5.3 Alarm resetting
There are two possible resetting modes which can be selected by
means of each of the switches SL and SP.
•
SL:
Dry running.
•
SP: High pressure.
Fig.
7
•
M (Manual). When acceptable conditions have been restored,
the pumps are started by pressing the reset button on the front
cover.
•
A (Automatic). When the pressure/level has reached an ac-
ceptable value, the pumps start automatically.
5.4 Pressure setting
The pumps are cut in and out according to the pressures set on
the pressure switches.
A common differential (
ƒ)
pressure (cut-out pressure – cut-in
pressure =
ƒ
pressure) must be set on the pressure switches.
The cut-out pressures differ 0.3 to 0.5 bar respectively (cascade
step).
Example:
•
3 pumps.
•
ƒ
pressure
= 1.5 bar.
•
Cascade step = 0.3 bar.
•
Pr 1, 2, 3
= Pressure switch 1, 2, 3.
•
P 1, 2, 3
= Pump 1, 2, 3.
Fig.
8
The settings of the pressure switches Pr 2 and Pr 3 are in a de-
creasing sequence as shown in the table and fig. 8.
When water is consumed, this is first tapped from the diaphragm
tank. Then the pressure drops to the first cut-in pressure, and the
first pump is cut in. If the consumption is still rising, more pumps
will be cut in until the performance of the pumps in operation cor-
responds to the requirements.
When the water consumption falls, the discharge pressure rises
to the cut-out pressure and the CS 1000 cuts out one pump. If the
consumption is still falling, more pumps will be cut out.
Note:
Each pressure switch is related to one pump only and not
necessarily to the same pump when pump alternation is selected
on the DIP switch, see section
5.2 Operation selection
.
Pressure switch Pr 1 must be set to the highest cut-in and cut-out
values.
5.5 Pressure switch
On each pressure switch, the following settings must be made:
•
Cut-out pressure.
•
ƒ
pressure (differential pressure).
Note:
The cut-in pressure is set as the cut-out pressure minus
ƒ
pressure.
Fig.
9
1. Cut-out pressure:
+ to increase.
– to decrease.
2.
ƒ
pressure (differential pressure):
+ to increase.
– to decrease.
5.6 Tank precharge pressure
The precharge pressure is equal to the minimum cut-in pressure.
TM
00 97
44 039
7
Pressure switch
and
pump numbers
Cut-in
pressure
[bar]
Cut-out
pressure
[bar]
ƒ
pressure
[bar]
Pr 1 / P 1
2.6
4.1
1.5
Pr 2 / P 2
2.3
3.8
1.5
Pr 3 / P 3
2.0
3.5
1.5
TM
00
97
32
02
97
SL
SP
Pr 1
Pr 2
Pr 3
Pr 1
Pr 2
Pr 3
Cu
t-
ou
t
Cut-
in
ƒ
pressure
Cascade
step
One pump
in operation
Two pumps
in operation
Three pumps
in operation
T
M
00
97
40
03
97
1
2