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UMG 508Checking the power measurementShort-circuit all current converter outputs exceptone and check the displayed power outputs.The UMG508 may only display one power outputin the phase with the current converter inputthat is not short-circuited. If this does not apply,please check the connection of the measurementvoltage and measurement current.If the amount of effective power is correct butthe sign of effective power is negative, this mayhave two causes:• Connections S1(k) and S2(l) are mixed up onthe current converter.• Effective power is returned to the network.In the pointer diagram, voltages are shown withthe longer pointers and currents with shorterpointers.Checking communicationThe UMG508 counts all received (RX), all sent(TX) and all faulty data packages.In the ideal case, the number of errors shown inthe error column is zero.ResetYou can delete the counters for the data packageswith key 6.The start time for the recount is reset.74