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Why the nvoDrvPwr readings are fluctuating below zero on ATV61 drive using Lonworks?

FA175847

24/01/2018

Issue:
In ATV61 drive with Lonworks, the nvoDrvPwr parameter readings are sometimes fluctuating below zero into negative power (i.e. -1kW). The range of the SNVT is from 0 to -1. Because when power is negative, the SNVT shows the highest power value i.e. 6553.4 kW. How can the the range of Drive Power be adjusted into a negative number? It works on Modbus and BACnet protocols but Lonworks does not allow.

Product Line:
ATV61

Environment:
All

Cause:
None

Resolution:
The scale is defined on a standard (LONMARK® Functional Profile: Variable Speed Motor Drive).
The solution is to use Scanner Input 1 (set the address of OPr on this register and read using the Lonworks variable nvoScannerIn1).

For more information, please see the file attached.