Digital Acoustics ESBx-110 Dokumentacja Pobierz pdf (Strona 124)

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101

Core Software Operation

ADDvantage-32 PLUS ● AC to DC Power Converter

3-44

Figure 3-9. Firing Adapter 2-CT Configuration Diagram

24) Return the parameters changed in steps 7 and 8 back to their original values, reset

drive and begin normal, non-AFM drive startup procedure. Continue on to step

25 if there is concern of having the incorrect burden resistor values.

Calculating Burden Resistor Values:

25) For both the 2CT and 3CT configurations (see Figures 1-5 and 1-6), the following

procedure applies to calculating burden resistor values. The value calculated

below corresponds to all three resistors R1 = R2 = R3.

26) Obtain the current rating for the CT. This is usually given as a turns-ratio. This is

equivalent to a ratio of input current to output current (Inpt Amps/Oupt Amps).

Calculate and record the Output Amps of the CT for an input current equal to

300% full load motor current. As an example, for a CT with an 800A/1A rating,

and rated motor armature current of 140A, the output of the CT at 300% motor

current would be:

(1A/800A) * 140A * (300%/100) = 0.525 Amps_Out

Actual CT output current at 300% motor current = _________________ Amps.

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