Panasonic KW8M User Manual

KW8M Eco-POWER METER (1A/5ACT input type)51Chapter 10 Q&AQ1 I’d like to measure by Eco-POWER METER.Measured load is 50 to 60A in normal operation. But the inrush current is 130 to 140 A.Which CT is selected? (100A or 250A)A1 Select 100ACT.Stable current more than 1 second is necessary to measure. The inrush current seems to be afew ms, therefore it can’t measure it. In case there is current over 1 second (inrush current), itmeasures it and select 250A CT.Q2 Current and voltage are displayed. But it can’t measure an electric power.A2 ・Do you install CT to the correct position and correct direction?CT has directions.Install CT according to the direction marked. From power supply side (K) to load side (L).・Do you wire measurement voltage input correctly?When phases of voltage and current are not matched, it can’t measure correctly.Please check the wiring.Q3 How long do I extend CT cable?A3 You can extend up to about 10 m with cable of AWG#22 or more.We can’t guarantee the specifications if you extend more than 10m.Q4 How do you guarantee the accuracy of measurement with low current range?A4 Up to 5% for CT rating.In case of CT50A, it guarantees for an electric power with current 2.5A or more.Q5 How long do I extend pulse input cable?A5 You can extend up to 10m with shielded wire or a metallic electric wire tube individually.Q6 What do I use the function of primary side current of CT for.A6 It is assumed that the use for 2nd stage CT with combination of CT.You set the primary side current of 1st stage CT (refer to mode1).In order to measure a large capacity current such as 1000A, it converts to 5A (small current) andmeasures the load.Q7 Are there any attachments in order to fix CT?A7 Sorry but there is no attachment.Q8 Eco-POWER METER measures only voltage and current. How is it measure an electric power?What is the reason why it can’t measure when CT is connected wrong direction?A8 Electric power is calculated using instantaneous voltage and instantaneous current.When CT is connected wrong direction, it measures minus value in fact, but it displays 0kW withEco-POWER METER.

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