MGE UPS Systems POWER-SURE 700 - Manual (Page 30)

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
480 (Nominal)
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 re-calculate.
Output voltage correction is a “stepped correction”. Adjusting P1 will not cause
a smooth change in output voltage as it is adjusted.
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 counter-clockwise =
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.
3.6 Final 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.
2. Disconnect customers loads.
3. Energize system.
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 3-16.
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.
Maintenance
Power-Sure™ 700 — Three Phase Power Conditioners
3 —8 86-108814-00 B01