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Building Technologies
Basic Documentation LMV27...
CC1P7541en
12 Load output X74 pin 3
17.12.2018
12 Load output X74 pin 3
This output delivers the current burner output. The analog output is a voltage output and
– using parameter 645 – can be switched between DC 0…10 V, DC 2…10 V and
DC 0/2…10 V.
Parameter 645
Voltage range
Remarks
0
DC 0…10 V
No detection of line interruption
1
DC 2…10 V
Detection of line interruption
possible
2
DC 0/2…10 V
No detection of line interruption
Note
When changing the analog output configuration from DC 0…10 V to DC 2…10 V or
DC 0/2…10 V, the voltage values with modulating, 2-stage and 3-stage operation
change (refer to chapters
Modulating operation
, chapter
2-stage operation
, and
chapter
3-stage operation
).
Conversion
: New value = (initial value * 0.8) + 2
Example: Initially
2
V
(2 * 0.8) + 2 = 3.6 V
Initially
5
V
(5 * 0.8) + 2 = 6 V
No.
Parameter
645 Configuration
of
analog
output
0 = DC 0...10 V
1 = DC 2...10 V
2 = DC 0/2...10 V
12.1 Safe separation of mains voltage and extra
low-voltage
Caution!
The load output is designed for SELV or PELV (refer to chapter
Electrical
connection of the LMV27
). For this reason, strict separation from the mains
voltage side must be ensured!
This necessitates power supply by an external power pack (X74 pin 1, X74 pin 2).
LMV...
Bild 433en/0916
VS
D
X7
4
5
4
3
Power output
2
GND
1
24 V external
Figure 70: Power output
