Hardware Prerequisite / Connection Diagram; Operating Modes Of Cox Supervision - Siemens LMV52 series User Manual

Suggested wiring
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Building Technologies Division

4.4 Hardware prerequisite / Connection diagram

The following hardware is required for COx supervision with LMV52.4:

COx sensor with a potential-free switching contact (NO contact).
The COx limit value at which the contact switches is defined in the COx
measurement transducer.

The COx sensor must be suitable for the fuels being used.

The PLL52, input X87 must be available for the COx sensor connection:
- For this, the supply air temperature sensor for calculating the firing efficiency can,
alternatively, be connected to input X60 of the load controller and activated by
means of the PLL52 parameter AirTempX60PT1000.
Parameter AirTempX60PT1000 (deactivated, activated)
- The Startmode parameter for O2 trim control must be set to standard or
IgnPtWoutTC, as all other start modes require a temperature sensor at input
X87 of the PLL52. In terms of the CO functions, we recommend using the
standard start mode only.
Parameter Startmode (standard, Ign Load TC, IgnPtWithTC, IgnPtWoutTC)

If input X87 on the PLL52 is used to connect the COx sensor, the PLL52 parameter
SupAirTempSens must be set to Pt1000.

COx control is only possible as of PLL52 software version V01.40, as this requires
a temperature range for the supply air temperature sensor of >400 °C.
PLL52...
X87
Pin 1
R1 R2
COxmax
- Resistor R1:
- Resistor R2:
- Relay in no-load status:
- Relay switched:

4.5 Operating modes of COx supervision

With the OptgMode COx parameter, one of the two COx operating modes COx Alarm
or COx Control can be set, and the COx functions deactivated.
Parameter Gas: OptgMode COx (deactivated / COx Alarm / COx Control)
Oil: OptgMode COx (deactivated / COx Alarm / COx Control)
User Manual LMV5...
COx supervision and control
X87
Pin 2
7.15 kΩ (±10%)
3.6 kΩ (±10%)
COx threshold exceeded
COx threshold not achieved
CC1A7550.5en
07.07.2015