User Manual

Output configu
ration
Load input,
start condition
A B C D
Start conditions with switching
command outputs
Number of
stages or
aggregates
4
1
Start
Run priority
changeover
(Example 2.1) A+B+C x d d d Yes
Description:
- 3 pumps controlled by one variable speed drive each.
- Control is on constant network pressure, the pumps are switched on in sequence depending on
demand.
- All switched on pumps run at the same speed (parallel operation, common DC 0…10 V output).
- The pumps' run priority changes from time to time to balance out operating hours. .
- The next pump is switched on in the event of a fault (fault changeover).
Plant diagram Function diagram
AI
DI
AO
DO
f
1
f
2
f
1
f
2
f
1
f
2

p
3123S47
1
2
3
1
2
3
0 %
Q
X
P
100 %
B
A
C
3123D28
Configuration diagram *
CD
C D
X
N.X1
N.Y1
C
C
A
Rotary
step switch 1
Logic 1
* Start conditions 2 and 3 are configured e.g.:
Start condition 2: [Switching value 2] On = 90 %, [Switching value 2] Off = 25 %
Start condition 3: [Switching value 3] On = 100 %, [Switching value 3] Off = 40 %
(See Section 8.3.11 for more information on start conditions).
Main menu > Commissioning > Extra configuration > Aggregates > Rotary step switch >
Rotary step switch 1…2 >
Configuration
Operating line Setting
Type Linear
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Siemens Switching and monitoring device RMS705B CE1P3124en
Building Technologies Aggregates 01.04.2010