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The corresponding aggregate is switched off in case of fault, and the next available
aggregate is switched on. See Section 8.3.12 for the associated configuration.
Fault
8.3.3
Flexible step switch
With the flexible step switch, load outputs are switched on that are capable of
covering the current output demand as per their rated output. In contrast to the
linear rotary step switch, different rated outputs can be handled per aggregate.
Switching loads
Both minimum output and rated output for the aggregate must be indicated when
working with an analog output. The flexible step switch calculates optimum switch-
on and switch-off of the individual aggregates for the entire output range.
The following overview shows configurations for using the flexible rotary step
switch.
Overview of configuration options
Output configuration
Load input,
start condition
A
B
C
D
Number of stages or
aggregates
4
1
Start
Run priority
changeover
A+B
a d d
No
A+B+C
a
d d d
No
Modulating load input with
switching command
outputs
A+B+C+D
(Example1) a
d d d d
No
Output configuration
Load input,
start condition
A B C D
Number of stages or
aggregates
4
1
Start
Run priority
changeover
Start conditions with
modulating output
A
x
a
No
Output configuration
Load input,
start condition
A B C D
Number of stages or
aggregates
4
1
Start
Run priority
changeover
A+B
a
a a
No
A+B+C
a
a a a
No
Modulating load input with
modulating load outputs
A+B+C+D
a
a a a a
No
Output configuration
Load input,
start condition
A B C D
Number of stages or
aggregates
4
1
Start
Run priority
changeover
Start condition with
switching command and
modulating load output
A
(Example
2) x d
a
No
Output configuration
Load input,
start condition
A B C D
Number of stages or
aggregates
4
1
Start
Run priority
changeover
A+B
(Example
3) a d
a
d
a
No
A+B+C
a
d a d a d a
No
Modulating load input with
switching command and
modulating load outputs
A+B+C+D
a
d a d a d a d a
No
The following pages provide practical examples, function diagrams, and
configuration diagrams for these applications options.
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Siemens
Switching and monitoring device RMS705B
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Building Technologies
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01.04.2010