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Siemens Building Technologies Basic Documentation LMV5... CC1P7550en
HVAC Products 7 Display and operating unit AZL5... 13.08.2004
Setting multistage ratio control «Followed»
The startup is made similar to modulating operation, including automatic entry of the ig-
nition positions in the operating positions «Stage 1», if these still display invalid values
(showing: XXX.X as a value).
P o i n t I A i r : 2 8 . 5
: B S 1 I A u x 1 : 2 8 . 4
O 2 I :
4 . 3 I :
For the fine adjustment of that point, confirm by pressing
Enter.
P o i n t I A i r : 2 8 . 5
: B S 1 I A u x 1 : 2 8 . 4
O 2 I :
4 . 3 I :
This causes output stage 1 to be approached. Here, the actuator to be adjusted can be
selected. Again, confirm by pressing
Enter.
P o i n t I A i r : 2 8 . 5
: B S 1 I A u x 1 : 2 8 . 4
O 2 I :
4 . 3 I :
Now, the value can be changed and the respective actuator follows at the rate of the
set ramp speed.
Enter saves the value and Esc rejects it.
In this way, all stages can be set one by one.
The following table shows the response of the system when a point is selected. How-
ever, the relevant valve is switched on only when at least the switching on point is defi-
nitely used (≠ XXXX).
Selected point Response Remark
Operating point stage 1 Approach of stage 1 Fine adjustment of stage 1
Switch-on point stage 1 Approach of stage 1 Setting from stage 1
Switch-off point stage 2 --
Setting from both stage 1 and
stage 2
Operating point stage 2 Approach of stage 2 Fine adjustment of stage 2
Switch-on point stage 3 Approach of stage 2 Setting from stage 2
Switch-off point stage 3 --
Setting from both stage 2 and
stage 3
Operating point stage 3 Approach of stage 3 Fine adjustment of stage 3
System response when a point is selected
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