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Application examples
Output configuration
Modulating load input with
switching command outputs
Load input,
start condition
A B C D
Number of
stages or
aggregates
4
1
Start
Run priority
changeover
(Example 1)
A+B+C+D
a
d d d d
No
Description:
- Several recirdulated air heaters with different capacities are controlled to room temperature.
- Rated outputs for the 4 aggregates controlled digitally by the flexible step switch: Aggregate A = 1
kW, Aggregate B = 1 kW, Aggregate C = 2 kW, Aggregate D = 3 kW.
- The total output at X
P
= 100 % is 7 kW.
Plant diagram
Function diagram
4
3
2
AI
DI
AO
DO
31
23
S
59
1
1 KW
1 KW
2 KW
3 KW
T
Configuration diagram
C D
C
D
X
Rotary
step switch 1
0 %
100 %
X
P
B
A
C
D
X
P
100 %
0 %
B
C
D
B
C
B
A
31
23
D
3
3
Main menu > Commissioning > Extra configuration > Aggregates > Rotary step switch >
Rotary step switch 1…2 >
Configuration
Operating line
Setting
Type Flexible
Main menu > Commissioning > Settings > ....
or
Main menu > Settings > Aggregates > Rotary step switch > Rotary step switch 1…2 >
Operating line
Range
Setting
Output A
0.1…999.9
1.0
Output B
0.1…999.9
1.0
Output C
0.1…999.9
2.0
Output D
0.1…999.9
3.0
91 / 216
Siemens
Switching and monitoring device RMS705B
CE1P3124en
Building Technologies
Aggregates
01.04.2010