7. Once the converter is delivering 105% of rated current and the current
mode indicator on the front panel is illuminated, rotate R54
counterclockwise until the current mode indicator just extinguishes.
Do not adjust beyond this point.
8. Remove prime power from the power supply and wait three minutes
(minimum) for the filter capacitors to discharge.
9. Repeat steps (1) through (8) for the balance of converter assemblies
A3 through A5.
Current Feedback Amplifier Zero Calibration
1. With prime removed, remove jumper J7 from all converter assemblies.
2. Apply prime power to power supply, and push the front panel switch to
the ON position.
3. Connect DMM between TP2 (U2, pin 1) and TP1 (common return) to
the converter assembly to be calibrated.
4. Adjust R36 for zero null (minimum voltage range on DMM).
5. Repeat steps 3 and 4 for the balance of the converter assemblies A3
through A5.
6. Remove prime power from the power supply and wait three minutes
(minimum) for filter capacitors to discharge.
7. Replace jumper J7.
Current Feedback Amplifier Full-Scale Calibration.
1. Remove prime power to the power supply. Remove J7 on all
converter assemblies not being calibrated. Leave jumper installed on
assembly to be calibrated.
2. Connect DMM between TP2 (U2, pin 1) and TP1 (common return).
Set DC voltage scale to read 5.0 volts.
3. Connect a second DMM across the external current shunt.
4. Rotate front panel voltage control fully clockwise.
5. Rotate front panel current control fully counterclockwise. This
changes the operation of the power supply from the voltage to the
current mode.
6. Apply prime power to power supply, and push the front panel switch to
the ON position.
7. Rotate front panel current control clockwise until DMM between TP2
and TP1 indicates 5.000 VDC.
8. Adjust potentiometer R33 of converter assembly being calibrated until
DMM across external current shunt indicates one-third the full-rated
output current for 10 kW power supply models.
9. Remove prime power from power supply and wait 3 minutes
(minimum) for filter capacitors to discharge.
10. Repeat steps (1) through (9) for the balance of converter assemblies
A3 through A5.
M550001-01
4-5
Summary of Contents for D3 Series
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