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Building Technologies Division
Basic documentation LMV36...
CC1P7544en
Infrastructure & Citiies Sector
14 Load output X74 pin 3
25.09.2013
14 Load output X74 pin 3
The load output is only available as an alternative to VSD control. If the VSD is
deactivated, the output for the VSD 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.
Recommended setting in
connection with Micromaster VSD
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
,
2-stage operation
and
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
14.1 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 LMV36... and AGM60...
).
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).
14.2 Modulating operation
Actual value
Voltage
Curvepoint
Display / output
value
Off
DC 0 V
---
Off
Ignition load
DC 1 V
P0
10%
Low-fire
DC 2 V
P1
20%
High-fire
DC 10 V
P9
100%
The values between low-fire and high-fire are interpolated in a linear manner.
14.3 2-stage operation
Actual value
Voltage
Curvepoint
Display / output
value
Off
DC 0 V
---
Off
Stage 1
DC 5 V
P1
P1
Stage 2
DC 10 V
P2
P2