Siemens LMV5 Quick Start Manual page 137

VSD Standardizing
A successful standarization can be done under:
Params & Display > VSD Module >Configuration > Standardized Sp
If a number is recorded under this parameter that is close to the full speed of the motor
(typically 3585 RPM, +/- 100 RPM), the standarization is successful.
If the VFD operates the blower during standardization but does not standardize successfully,
consider the following:
1) Verify the following:
a. The speed wheel is installed on the blower motor correctly (see Section 2)
and the gap between the inductive sensor and the speed wheel is correct.
b. The inductive sensor is wired to the LMV52 correctly,
on terminals (X70.1, X70.2 and X70.3)
c. The yellow LED on the back of the inductive sensor should blink every time
a speed wheel "finger" passes by the nose of the sensor.
If it does not blink, the sensor is wired incorrectly or is defective.
d. If everything is correct with the speed sensor, the real time RPM can be read under:
Params & Display > VSD Module > Absolute Speed
For troubleshooting purposes, the RPM can be read here
during the standarization process.
2) Check to ensure that the air damper opens when the standardization is activated.
If this does not happen automatically, make sure that the air actuator is set to air
influenced, the safety loop is closed, and that the LMV52 is not in an alarm.
3) Check the ramp time on the LMV52 and the VFD.
The ramp time on the VFD must be faster than the ramp rate on the LMV52.
If the VFD ramp time is set at 30 seconds,
the LMV52 ramp time should be set at least 40 seconds.
The LMV52 ramp rates can be found under:
Both the TimeNoFlame parameter and the OperatRampMod parameter should be set to at
least 40 seconds for a VFD ramp time of 30 seconds.
In general, the VFD ramp time should be set about 25% faster than the LMV52 ramp time.
4) Monitor the RPM of the blower motor during the standarization process.
After standardization is activated, the real time RPM can be read under:
Params & Display > VSD Module > Absolute Speed
During standarization, the indicated RPM should rise up to a peak value
and hold steady at that value for a few seconds,
and then drop back to zero or near zero.
This peak value that is seen should be recorded automatically under:
Params & Display > VSD Module >Configuration > Standardized Sp
If this doesn't happen, it's likely that there's a problem with the VFD or the speed wheel.
LMV5 QSG Rev 4
Params & Display > Ratio Control > Times
Sec 5 Pg 11 www.scccombustion.com