Output configuration
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 2.2) A+B+C+D x d d d d Yes
Description:
- 4 evaporator pumps available for 3 single-stage refrigeration machines.
- Max. 3 pumps are operating at the same time (1 standby).
- An evaporator pump is switched on each time a refrigeration machine is released.
- The run priority of the pumps changes periodically between the 4 pumps (first in, first Out). - The next
pump is switched on in the event of a fault (fault changeover).
- The function diagram shows a snapshot: Sequence ABC in operation; A takes priority; D in standby.
Plant diagram Function diagram
Evp
AI
DI
AO
DO
T
1
2
3
4x
4x
3123S49
1
2
3
4
1
2
3
4
0 %
Q
X
P
100 %
B
A
C
3123D28
Configuration diagram *
CD
C D
X
C
D
Rotary
step switch 1
* The start conditions of the rotary step switch are configured as per the refrigeration machine
releases.
Main menu > Commissioning > Extra configuration > Aggregates > Rotary step switch >
Rotary step switch 1…2 >
Configuration
Operating lin
e Setting
Type Linear
83 / 216
Siemens Switching and monitoring device RMS705B CE1P3124en
Building Technologies Aggregates 01.04.2010
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