Siemens LMV5 Series Technical Instructions page 345

LMV Series
Low Fire Hold with an RWF55 (continued)
Procedure – Steam Boiler with an RWF55 with Analog Output
In the case of steam boilers, temperature sensors located in the boiler water jacket are
recommended. Technical Instructions SEN-1000 provides additional information on
temperature sensors.
1. Set the following parameters in the LMV5:
Params & Display > LoadController > Configuration > LC_OptgMode = ExtLC X62
Params & Display > LoadController > Configuration > Ext Inp X62 U/I = 0..20 mA
2. Set the following parameters in the RWF55:
ConF > Inp > Inp1 > SEn1 = signal type of pressure sensor
ConF > Inp > Inp1 > SCL1 = 0
ConF > Inp > Inp1 > SCH1 = high end of the range of the pressure sensor
ConF > Inp > Inp3 > SEn3 = type of RTD being used for a belly sensor
ConF > Cntr > CtYP = 2
ConF > AF > FnCt = 11
ConF > AF > AL = temperature to enable low fire hold
ConF > AF > HYSt = deadband around low fire hold temperature
ConF > OutP > FnCt = 4
ConF > OutP > SiGn = 0
3. Wire the LMV5 and RWF55 as shown in Figure 4:
Figure 4: Low Fire Hold via Analog Output on a Steam Boiler
See page 19 for an example of the low fire hold operation.
SCC Inc. Page 15
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Technical Instructions
Document No. LV5-8000
Appendix A