Infinite TRANSTECTOR 700 AV/T Series Owner's Manual page 29

TROUBLESHOOTING CONTINUED
Turn main AC on. With DC voltmeter on the millivolt scale check between TP1 and TP GND of the
control card and adjust pot P2 so meter reads "0" millivolts or close as possible.
NOTE: Refer to Appendix A Page A51 for test points and pot locations on control card.
CONTROL BOARD ADJUSTMENTS (continued)
Use the following formula to calculate the next adjustments. You must calculate each input phase for
CONTROL BOARD ADJUSTMENTS (#414921)
each control card or a total of 3 calculations.
FIELD ADJUSTMENT PROCEDURE continued
A. For phase 1 control card measure AC input at Line 1 to Line 2.
B. For phase 2 control card measure AC input at Line 2 to Line 3.
FORMULA X
C. For phase 3 control card measure AC input at Line 1 to Line 3.
Example:
FORMULA
Actual AC Input x 2.47
480 (Nominal)
475 Volts AC Input x 2.47
480 (Nominal)
After calculations are complete, place DC voltmeter on the 20 volt scale and check between TP2 and TP
GND on control card. Adjust pot P1 so meter reads DC level calculated in Step 7 for all three phases.
ƒNOTE: Be sure AC input is stable when making this adjustment. If the input changes, you
must re-calculate.
NOTE: If adjustments in Steps 6 and 7 are not possible, replace control card # 414921 and repeat Steps
6 and 8.
7. After calculations are complete, place DC voltmeter on 20 volt scale and check between TP2
and TP GND on control card. Adjust pot P1 so meter reads DC level calculated in Step 6 for
NOTE: Be sure to turn power off when replacing circuit boards.
all 3 phases.
NOTE: Be sure AC input is stable when making this adjustment. If the input changes, you must
NOTE: Output voltage correction is a "stepped correction", adjusting P1 will not cause a
re-calculate.
smooth change in output voltage as it is adjusted.
NOTE: Output voltage correction is a "stepped correction", adjusting P1 will not cause a smooth change
8. Turn unit off and reconnect TB2 connectors on all control boards.
in output voltage as it is adjusted.
9. Turn unit on, verify output is correct by monitoring the output from each line to neutral. If not,
make sure input power is stable and repeat adjustment procedure.
Turn the unit off. Plug in TB2 Molex connectors to all the control cards #414921.
NOTE: P1 Pot turned clockwise =decrease in output voltage and counter clockwise = increase
Replace connectors K1 and K2 on over/under detect #35867.
in output voltage. By changing this adjustment on 1 phase you may see the output voltage
change from line to neutral on 2 phases. It is best to use procedures in Steps 1-9 when
NOTE: P1 pot turned clockwise = decrease in output voltage and counter-clockwise = increase in output
adjusting.
voltage. By changing this adjustment on phase1 you may see the output voltage change from
line to neutral on two phases. It is best to use procedures in Steps 1 – 9 adjusting.
= Volts DC at TP2
= 2.44 Volts DC at TP2
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