Suggested Setup Procedure For The Vfd Control - Siemens LMV5 Series Technical Instructions

LMV Series
Suggested Setup Procedure for the VFD Control
After verifying that all VFD related components are installed and wired correctly, the VFD control can be
set up. Naturally, if the burner has a VFD, this must be done before the Ratio Control Curves are
commissioned.
Particular attention should be paid to the following points:
1. The arrow on the speed wheel points in the same direction as the correct blower rotation.
2. The gap between the inductive sensor and the speed wheel finger is correct (approx. 1/16").
3. The VFD, motor, and LMV52 share a common ground.
4. The analog signal from the LMV52 to the VFD must be in shielded cable with one end of the shield
grounded.
After these points are double‐checked, the LMV52 parameters can be set.
1. Activate the VFD. The VFD control can be activated / deactivated for either fuel in a dual fuel
burner. Typically, if a burner has a VFD, it will be activated on each fuel. The VFD can be activated
using the following menu path:
Params & Display > RatioControl > Gas/Oil Setting > VSD
2. Set the air actuator to be "air influenced". This is done so that the air damper will open to pre‐purge
position when the LMV52 is standardized. This can be done using the following menu path:
Params & Display > RatioControl > Gas/Oil Settings > AirActuator = air influen
3. Set or check the LMV52 ramp times. Both of these must be at least 5 seconds longer than the ramp
times set in the VFD. The ramp times can be checked using the following menu path:
Params & Display > RatioControl > Times > OperatRampMod
Params & Display > RatioControl > Times > TimeNoFlame
4. If using a 6‐finger speed wheel (rarely necessary ‐ only if the VFD will be operated under 300 RPM),
change the number of pulses per revolution from 3 to 6 using the following menu path:
Params & Display > VSD Module > Configuration > Speed > Num Puls per R
5. Configure the analog output of the LMV52 to match the analog input of the VFD. Typically, a 4‐
20mA signal is used. The analog output signal can be set using the following menu path:
Params & Display > VSD Module > Configuration > Speed > Setpoint Output
6. If the VFD was not purchased pre‐programmed for an LMV52, set the relevant VFD parameters. See
section on previous pages titled "Configuring VFDs for use with the LMV52".
SCC Inc. Page 15
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Document No. LV5‐1000
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