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.
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.