| FORMULA | |
| AC Input x 2.47 = Volts DC at TP2 | |
| 480 | (Nominal) |
Example: | 475 | Volts AC Input x 2.47 = 2.44 Volts DC at TP2 |
8.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 of Section 3.5.1 for all three phases.
NOTE: | If adjustments in Steps 6 and 7 are not possible, replace control card |
| #49120/407415 and repeat Steps 6 and 8. |
| Be sure to turn power off when replacing circuit boards. |
| Be sure AC input is stable when making this adjustment. If the input changes, |
| you must |
| Output voltage correction is a “stepped correction”. Adjusting P1 will not cause |
| a smooth change in output voltage as it is adjusted. |
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9.Turn the unit off. Plug in TB2 Molex connectors to all the control cards #49120/407415.
10.Replace connectors K1 and K2 on over/under detect #35867.NOTE: | P1 pot turned clockwise = decrease in output voltage and |
| increase in output 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 of Section 3.6. |
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3.6Final Testing and Adjustments
1. Connect AC voltmeter to output of system with proper meter scale selected.NOTE: | On 3 phase systems, connect your AC voltmeter across the output phase |
| to neutral. |
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4.Verify the output is within specifications. If not, adjust P1 on control board, for the appropriate phase. See Section 3.9.2, Control Card Adjustment Procedure, page
NOTE: | On 3 phase systems, be sure and check all 3 phases. |
| If the main AC breaker trips or there is no output voltage, disable the over/under |
| detect circuit #35867 by disconnecting K1 and K2 connectors and then calibrate |
| the control boards if the output voltage is out of spec. |
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| 3 | Maintenance |