LMV52… Burner management system for forced draft burners LMV52.4…: - COx supervision and control User Manual The LMV5 and this User Manual are intended for OEMs which integrate the LMV5 in their products! Note! This documentation is only valid together with the LMV5... Basic Documentation P7550.
Contents Supplementary documentation ..............3 Warning notes ....................4 Typographical conventions ................4 COx supervision and control ................ 5 General ......................5 Compatibility of the COx functions ..............5 ...
Supplementary documentation Type of documentation Product type Documentation number AZL5... A7550 User Documentation AZL5... Modbus LMV5... User Documentation A7550.1 Basic diagram of LMV5... for 2 types of gas LMV5... User Documentation A7550.3 Basic diagram of LMV5... for 2 types of liquid fuel LMV5...
To avoid injury to persons, damage to property or the environment, the following warning notes must be observed! The LMV5 is a safety device! Do not open, interfere with or modify the unit. Siemens will not assume responsibility for any damage resulting from unauthorized interference! Typographical conventions...
COx supervision and control 4.1 General Note! The COx sensor is not included in the Siemens AG scope of delivery. OEM customer is responsible for checking that the sensor is suitable for the functions described below. 4.2 Compatibility of the COx functions...
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.
4.5.1 COx Alarm operating mode For straightforward supervision of the COx value, the parameter OptgMode COx must be set to COx Alarm. Phases of COx alarm: Once prepurging is complete (upon entering phase 36), a single check is performed to determine whether a COx signal is present. If a COx signal is present, the fault response takes place immediately.
4.5.2 COx Control operating mode This operating mode is only implemented for modulating operation. The function is not available in multi-stage oil operation. In addition, the O2 trim control function must be activated (O2 trim controller operating modes: O2 Control or conAutoDeac). This operating mode is activated by setting the OptgMode COx parameter to COx Control.
4.6 Increasing the manipulated variable in case of COx signal (O2ModOffset, formerly O2Offset) If the COx maximum value is exceeded, the contact is closed (see chapter Hardware prerequisite / Connection diagram). In order to prevent this, the user can use parameters to set an offset for the O2 value in the event that a COx signal occurs.
4.7 Setting notes (Summary of the most important rules for setting COx control) 4.7.1 Parameterizations Parameterize all truly air-regulating actuators as such If the parameter settings are changed, O trim control must be readjusted First of all, the O2 trim control must be set with deactivated COx sensor (see chapter Operating modes of COx supervision) Parameter OptgMode COx Gas (deactivated, COx Alarm, COx Control)
4.7.3 Setting the O2 trim controller Setting the O2 min. value The O2 min. value should be set as low as possible to ensure a high level of availability. Caution! Above or at the O2 min. value, hazardous conditions must not permanently occur.
4.8 Display on the AZL52 If a COx signal occurs, a notification is output on the AZL52. The notification is automatically deleted if no further COx signals are present. 4.9 Displaying the O2 trim controller status Also refer to the chapter Displaying the O2 trim controller status in the LMV5 Basic Documentation (P7550).
List of error messages of LMV5 system Error Diagnostic Device Display Meaning for the LMV5 system Troubleshooting code code LMV5 COx alarm error messages Check connection between the COx sensor and PLL52, check COx signal is not within the defined range LMV5 COx value invalid cable connection on the PLL52 basic unit, correct resistance...
Error Diagnostic Device Display Meaning for the LMV5 system Troubleshooting code code Compensation element voltage outside Check connections (polarity, short-circuit, open-circuit). No valid COx signal from PLL52 the valid range Check housing temperature of the QGO (temperature inside - 25...120 °C) Temperature of combustion air sensor Check the connection (correct polarity, short-circuit) No valid COx signal from PLL52...
Error Diagnostic Device Display Meaning for the LMV5 system Troubleshooting code code CRC fault of a parameter page Reset the unit No valid COx signal from PLL52 Attention! If fault occurred during parameterization: Check the parameters changed last. If fault cannot be rectified by the reset: Restore parameters from AZL5.
Error Diagnostic Device Display Meaning for the LMV5 system Troubleshooting code code Fault during copying of a parameter page Reset the unit No valid COx signal from PLL52 Attention! If fault occurred during parameterization: Check the parameters changed last. If fault cannot be rectified by the reset: Restore parameters from AZL5.