Technical FAQs

Ask a Question

What is the resolution unit range and wrap around for Energy counters displayed on PM9C

Regarding the roll over of PM9C, please note that the energy counters are displayed with 8 digits. Resolution unit and wrap around depend on the CTxPT product value according to the table as attached. 
 
Regarding the CT & PT ratio mentioned in PM9C, as shown in the manual, it would be the ratio of net value (i.e. if CT ratio is 50:5, the value should be 10). So take installation manual's CT & PT ratio example for this example, if CT ratio = 100/5 while PT ratio = 690/100 
i.e. CT = 20 while PT= 6.9 
thus CT * PT = 20*6.9 = 138 in this case. Then it would fall into 3rd category of the attached table in this case. 
Was this helpful?
What can we do to improve the information ?