Basic Documentation

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Siemens Universal controllers RMU710B, RMU720B, RMU730B CE1P3150en
Building Technologies Aggregates 03.10.2011
10.6.2 Linear step switch
The linear step switch connects the relay outputs in equal steps.
Load connection applies the following pattern:
Q
0 %
Y+Q
Y
Q
0 %
Y+Q
X
P
X
P
100 %
100 %
Y
Step 1
Step
2
Step
3
Step
4
Step
4
Step
3
Step
1
Step
2
3150D12en
Switching distance, example with 2 digital outputs:
0% 100%
x x x x x x
0% 100%
Y1
Q2
Q1
¼ x
3150D26
Q
0Y + 2Q
ON
ON
OFF
OFF
1Y + 2Q
Q
MAXPOS
MINPOS
Distance X is equal to 100% load divided by (number of steps +1).
To prevent excessively quick runup, you can enter a common startup delay time.
This delay makes the controller wait for the set time between the steps during
startup.
With the linear step switch, you can set a priority changeover of the outputs. The
priorities change at fixed intervals every week (always after 7 x 24 = 168 hours).
Changeover is as follows (example with 4 steps):
Week 1: 1, 2, 3, 4
Week 2: 2, 3, 4, 1
Week 3: 3, 4, 1, 2
Week 4: 4, 1, 2, 3
Week 5: 1, 2, 3, 4
Priority changeover is reset by a power outage.
Load connection
Note on diagram
Startup delay
Run priority changeover
Note