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Output configuration
Load input,
start condition
A B C D
Start condition with switching
command and modulating load
output
Number of
stages or
aggregates
4
1
Start
Run priority
changeover
(Example 2)
A
x d
a
No
Description:
- Step-wise control of a modulating aggregate (pump, digital/analog conversion).
- 3 refrigeration machines (1-stage) use a common twin evaporator pump (with integrated variable
speed drive) for changeover operation (2 x 100%) with internal run priority changeover.
- Pump(s) control comprises release and a DC 0…10 V signal for three adjustable steps.
- The function diagram shows one sample setting for the steps.
Plant diagram
Function diagram
f
1
f
2
Evp
AI
DI
AO
DO
1
2
3
31
2
3
S
6
1
Q
31
23
D
3
4
20 %
40 %
40 %
1
2 3 4
Start
1
2
3 4
Start
0...10 V
1 2
3
4
Start
2 V
6 V
10 V
Configuration diagram *
C D
C
D
X
A
Rotary
step switch 1
*
The start conditions are configured as per the refrigeration machine releases.
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
Setting
[Switching value 1] load
20 %
[Switching value 2] load
40 %
[Switching value 3] load
40 %
Min output A
0.0
Output A
1.0
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Siemens
Switching and monitoring device RMS705B
CE1P3124en
Building Technologies
Aggregates
01.04.2010