Post Commissioning Tuning - Siemens LMV5 Series Technical Instructions

Technical Instructions
Document No. LV5‐1000
Post Commissioning Tuning
After the O curves have been set up according to the procedures above, some additional burner / boiler
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specific tuning may be necessary to keep the O
tuning parameters is discussed below.
LoadCtrlSuspend ‐ This sets the load change that is necessary to make the O
O trim to pre‐control. Many factors influence the setting of this parameter.
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Menu path: Params & Display > O2Contr/Alarm > Gas Settings > Control Param
Higher settings (more active trim, less pre‐control) can help the O
following situations:
1. The O Control Curve is relatively flat from low fire to high fire (varies less than 0.5% O
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2. The modulation ramp time is slow (OperatRampMod is set to 60 seconds or more)
3. The delay time (Tau time) of the boiler is relatively fast (Tau Low‐Fire is set to 7 seconds or less)
Lower settings (less active trim, more pre‐control) can help the O
following situations:
1. The O Control Curve slopes from low fire to high fire (varies more than 0.5% O
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2. The modulation ramp time is fast (OperatRampMod is set to 30 seconds)
3. The delay time (Tau time) of the boiler is slow (Tau Low‐Fire is set for more than 7 seconds)
O2TrimBehavior ‐ If parameter Startmode is set to "standard", this setting controls how the O
responds if the measured O
Menu path: Params & Display > O2Contr/Alarm > Gas Settings > Control Param
1. A setting of "ForcedAirAdd" will help if deactivations are due to the rich limit (O
be added more aggressively.
2. A setting of "ForcedAirRed" will help if deactivations are due to the lean limit (O2 MaxValue) since
air will be subtracted more aggressively.
3. A setting of "symmetric" is used when the rich limit (O
relatively close together, and an aggressive correction in one direction might cause a deactivation
due to the other limit.
NOTE: On an LMV52.440 with the StartMode set to something other than "standard", the setting of
O2TrimBehavior has no effect.
O2ModOffset ‐ During a load change when the pre‐control becomes active (see LoadCtrlSuspend), this
will temporarily add more air beyond what is prescribed by the Lambda Factor. Increasing this setting
can help with rich limit (O
used as a substitute for proper O
Menu path: Params & Display > O2Contr/Alarm > Gas Settings > Control Param
Section 6 Page 20 SCC Inc.
trim operating properly. When and how to use these
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value starts to move away from the O
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alarm) deactivations during modulation, but this parameter should not be
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trim commissioning procedures.
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trim transition from active
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trim stay close to setpoint in the
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trim stay close to setpoint in the
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setpoint significantly.
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alarm) and the lean limit (O2 MaxValue) are
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LMV Series
)
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)
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trim
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alarm) since air will
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