Siemens LMV5 Series Technical Instructions

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Technical Instructions LMV SeriesDocument No. LV5‐1000Section 4 Page 28 SCC Inc.Additional Tips for Commissioning If an LMV52 is being commissioned, activate the O 2 sensor as soon as possible. Once the O2sensor is heated, this will show a fast responding O 2 value on the AZL screen during RatioControl Curve commissioning. This sensor reads %O2 wet so the value will be somewhat lowerthan an external flue gas analyzer. Using a fuel flow meter (temporary or permanent) for commissioning is always a good idea evenfor LMV51’s without O2 trim. If the fuel input (heat output) increases linearly with firing rate,the PID loop in any load control will work much better. A temporary, insertion type of flowmeter is available from SCC Inc. for this purpose. If burner head pressure must be used as a last resort to estimate firing rate, bear in mind thathead pressure does not increase with gas flow in a linear manner. There is a square rootrelationship between the differential pressure across the burner head and the gas flow. Thisrelationship is very similar to how the pressure varies across a fixed orifice with an increase ordecrease in flow. Also, furnace pressure must be accounted for by hooking up both sides of themanometer, one side to the burner head pressure and one side to the furnace pressure. Carbon Monoxide (CO) is produced when combustion is incomplete, typically due to the flamebeing too rich or too lean. CO is potentially explosive when mixed with air in the rightproportions. For CO to be explosive in air, it must reach a concentration of at least 12.5%(125,000 ppm) with an ignition source present. If a burner is commissioned properly, actuator curves should increase smoothly with increasingload (firing rate). One exception to this would be the FGR actuator (Aux1 or Aux3) whichcommonly decreases (closes) as firing rate increases. Curves should always be smooth, with nosharp corners. The best and fastest method to commission a burner with an LMV5 is to set up a small tablewhere the technician can have his laptop, AZL, fuel flow meter and external flue gas analyzer allwithin arm's reach. This allows the curve points to be input rapidly and accurately. If theinformation is entered in the laptop point by point, a very nice start‐up report will also begenerated. The ACS450 software is not as fast as using the AZL to commission the LMV5. Since this is thecase, the ACS450 is typically not used to commission the LMV5. However, the ACS450 is veryvaluable when used to download an .mdb file (all parameter settings, fault and lockout history,in English) and also when used to download .par files (the machine‐language parameter set fromthe LMV5). It is recommended to download both of these files after commissioning, so thatthere is a backup record of all parameter and curve settings. To go back out of the menu and check burner operation, press the < and > buttons at the sametime. This will take the cursor to Normal Operation, so the normal operation screen can beviewed by pressing Enter. This can be done anywhere in the menu as long as a single parameteris not currently displayed. Pressing Esc will take the cursor back in to where it was in the menu.