www.janitza.com UMG 103-CBM
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7. Installation 26
7. 1 Nominal voltages 26
7. 1. 1 Three-phase four-conductor network with grounded neutral conductor 26
7. 2 Circuit breaker 27
7. 3 Supply voltage 27
7. 4 Voltage measurement 28
7. 4. 1 Overvoltage 29
7. 4. 2 Frequency 29
7. 4. 3 Connection variants for voltage measurement 29
7. 5 Current measurement 30
7. 5. 1 Connection variants for current measurement 31
7. 5. 2 Ammeter 32
7. 5. 3 Current direction 32
7. 5. 4 Summation current measurement 32
8. Connection and PC connections 34
8. 1 Connection variants 34
8. 2 RS-485 interface 35
8. 3 Shielding 35
8. 4 Bus structure 36
8. 5 Termination resistors 36
9. Configuration 38
9. 1 Current and voltage transformer 38
9. 2 Device address 39
9. 3 RS-485 39
10. Commissioning 40
10. 1 Measured voltage / supply voltage 40
10. 2 Measured current 41
10. 3 Direction of rotary field 42
10. 3. 1 Fundamentals on the phasor diagram 42
10. 3. 2 Checking of voltage and current inputs by means of phasor diagram 43
10. 4 Control of the power measurement 44
10. 5 Checking measurement 44
10. 6 Checking individual power 44
10. 7 Checking summation power 44
10. 8 Energy meters - clearing minimum and maximum values 45
10. 9 Overrange 45
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