Siemens LMV5 Series Technical Instructions

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LMV Series Technical InstructionsDocument No. LV5‐1000SCC Inc. Page 9 Section 7Open Circuit / Short Circuit Sensor Faults – Error Code A6 (Diagnostics 50…5A)An error code A6 (diagnostic code 50…5A) means that the LMV5 is configured for a certain typeof sensor, but it is not detecting that the sensor is connected. This means that a parameter inthe LMV5 is set incorrectly, the wiring of the sensor is incorrect, or the sensor has failed.Note: Some of the fault code messages refer to Input 2 or Input 3. Input 2 is terminal X61which is used for pressure sensors. Input 3 is terminal X62 which is used for remote setpointand modulation signals.Check the following:1. Ensure that the parameters used to program the analog inputs are set correctly: LC_OptgMode Sensor Select Ext Inp X61 U/I Ext Inp X62 U/ISee Section 3 for information on how these parameters should be set.2. If all of the above parameters are set correctly, check the wiring of the attached sensors.See Section 2 for information on how to wire sensors to the LMV5.3. On a steam boiler, a temperature sensor can be used in addition to the pressure sensor forthe cold start function. If this is the case, check the setting of parameter AdditionalSens.See Section 3 for more information on how to set this parameter.4. An additional FGR temperature sensor can be installed to perform an FGR hold function. Ifparameter FGR‐Mode is set to “temperature”, “temp.contr.”, or “TCautoDeact”, an FGRsensor is expected to be wired into terminal X60 or X86, depending on the setting of FGR‐sensor. If this parameter is set to X60, check that the sensor is wired correctly.5. If O2 trim is being used, an ambient air temperature sensor can be wired into terminal X60.Check the setting of parameter AirTempX60PT1000. If this is set to activated, a Pt1000temperature sensor is expected to be wired into terminal X60.