Siemens LMV37.4 Series Basic Documentation page 259

Building Technologies
Software version V03.70

Optimization: No locking with C:75 via asynchronous load controller source

Extension: Support of PWM fans and symmetrical feedback

Extension: Increase in the maximum speed to 14000 rpm

Extension: Additional monitoring of the minimum prepurge speed, maximum ignition
speed and minimum speed / maximum speed during operation

Extension: Increased flexibility when setting the curve (gradient VSD curve)

Extension: Operating modes for G / Gp2 with mechanical fuel-air ratio control (air
actuator only)

Extension: Trim function for e.g. O2 or temperature

Extension: Separate phase for running the fan to ignition speed, postpurge speed or
standby speed, as well as increased speed tolerance outside operation

Extension: Speed-dependent air pressure switch

Extension: Increase in the flame sensitivity

Extension: Gas pressure switch-min positioned after the fuel valves (CSA 149.3)

Extension: Immediate lockout in the event of inadequate air supply (UL 795 / EN
676)

Optimization: No repetition during successive error messages

Extension: At the end of the speed standardization, the speed must be <10%

Extension: Modbus data points
140 = fuel 0 operating mode (parameter 201)
141 = fuel 1 operating mode (parameter 301)
142 = meter for function Revert to Pilot
144 = lower range limit trim function
145 = upper range limit trim function
146 = lower range limit trim function fuel 1
147 = upper range limit trim function fuel 1
148 = input value analog input trim function
149 = current trim impact
150 = absolute speed
151 = standardized mains voltage (conversion required)
Basic Documentation LMV37.4...
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CC1P7546en
17.12.2018