Digital Acoustics ESBx-110 Especificaciones descargar pdf (Pagina 122)

100

101

Core Software Operation

ADDvantage-32 PLUS ● AC to DC Power Converter

3-42

15) If no current is indicated on the microprocessor board, then check to insure that

the PHASE A CT is connected to the PHASE A input on the FIRING MODULE,

PHASE B CT is connected to the PHASE B input, and PHASE C CT is connected

to the PHASE C input. Also check that the cables between the SCR Firing

Adapter and the Field Supply Assembly are in place and secured by tightening

screws on cable ends.

16) If the voltage observed on the scope is negative, instead of the positive pulses

shown in Figure 3-6, reverse all CT polarities. If the CT leads are difficult to

reach, switch the wires for all CTs at J1 of the SCR Firing Adapter.

17) If the voltage waveform observed on the scope has some positive segments and

some negative segments as shown in Figure 3-7, then follow either the 3-CT or

the 2-CT feedback phasing method, using the type your application has been

configured with.

DCAFMC7LAN

Micro Board Iarm Tp

(One CT incorrectly Phased)

-1.5

-1

-0.5

0.5

1.5

0 2.77 5.545 8.32 11.095 13.87 16.667

Time (ms)

Voltage

Figure 3-7. Micro Board Iarm TP

(One CT Incorrectly Phased)

3-CT Feedback Phasing Method:

18) The 3-CT feedback configuration wiring diagram and jumper settings for the

A20651 SCR Firing Adapter are shown in Figure 3-8. Check the polarity of the

feedback pulses across each burden resistor with the polarities indicated for each

resistor in Figure 3-8. Example: Positive pulses (Figure 3-4) should be observed

for a burden resistor when the scope probe is connected to the resistor + and scope

ground to the resistor -. Confirm these pulses at J1 of the SCR Firing Adapter.

The burden resistor polarities are most easily identified here.

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