Additional Tips For Burners With Vfd Control - Siemens LMV5 Series Technical Instructions

Technical Instructions
Document No. LV5‐1000
7. If working on an un‐configured LMV52, parameters unrelated to the VFD must be set before the VFD
can be standardized. These are thoroughly outlined in Section 4 under "Configuring
(Parameterization of) an LMV5 with a Default Parameter Set". To summarize, the following must be
set: burner ID, fuel train, actuator addresses, actuator directions of rotation, and actuator special
positions.
8. The LMV52 safety loop must be closed (high limit, low water, burner flange, etc...) or the
standardization will not occur even if the LMV52 is not in alarm.
9. The burner switch must be off (LMV52 input X5‐03.1 must be de‐energized).
10. The VFD must be in remote mode so that it will respect the run‐stop contact and the analog signal
from the LMV52.
11. The LMV52 / VFD / blower are now ready to be standardized. The standardization process can be
initiated using the following menu path:
Params & Display > VSD Module > Configuration > Speed > Standardization
Set parameter Standardization to "activated". The air damper should then drive to the pre‐purge
position and the VFD / blower should ramp up to approximately 60 Hz (100% VFD). After a few
seconds at 60 Hz, the VFD / blower should ramp back down to 0 Hz. The air damper should also
drive back to home position.
12. Check the standardized speed, which is the product of the standardization, using the following menu
path:
Params & Display > VSD Module > Configuration > Speed > StandardizedSp
For 2‐pole blowers, the standardized speed should be 3500 RPM, +/‐ 100 RPM. If the speed is out of
this range, the drive was most likely not spanned so that 20mA = 62Hz, or the motor is heavily
loaded (a lot of slip). The same logic applies to 4‐pole motors, except the speed should be 1700 +/‐
100 RPM.
13. If the LMV52 does not have O
of "air influen" using the following menu path:
Params & Display > RatioControl > Gas/Oil Settings > AirActuator = activated
Additional Tips for Burners with VFD Control

Most of the time, speed faults that are seen on the LMV52 are caused by the VFD not being able to
decelerate the blower when the blower is being ramped down. If fast ramp times are not critical for
the application, ramp times can be increased and this should correct the issue. If fast ramp times
are necessary, a braking resistor may also be required to achieve the fast ramp down times.
Section 5 Page 16 SCC Inc.
trim, the air damper actuator can be set back to "activated" instead
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