Galaxy PW™ UPS 100 to 225kVA
In the event of a UPS shutdown (initiated by the user or by an internal protective device), the load is automatically transferred to the bypass AC source. If transfer conditions are satisfied, transfer takes place instantly, without inter- ruption to the load.
NOTE | Transfer conditions are not satisfied when bypass AC source characteristics are |
| outside tolerances (voltage: ±10%. frequency as per personalization. phase sync |
| with inverter ±3°). |
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In the event of a major transient overload (greater than 1.65 In), immediate transfer takes place as above, without interruption to the load.
The return to the inverter is automatic when the overload disappears if the number of possible returns has not been reached (0 to 255, programmable by personalization). If this number has been reached, the load continues to be supplied by the bypass AC source. This operating mode allows
This system requires satisfied transfer conditions. If the conditions are not satisfied, the inverter will current limit to 165% of its rated current for 1 second before stopping.
In the event of a small but extended overload (i.e. a continuous level of power exceeding the full rated load), the inverter will continue to supply power for a period depending on the magnitude of the overload (10 minutes for a 125% overload, 1 minute for a 150% overload). See the overload curve in Figure
◗In all the above cases, inverter shutdown and supply of the load via the bypass AC source results in the following on the control panel:
-light 4 goes off,
-activation of the buzzer (continuous beep),
-light 3 shines green,
-the message "LOAD NOT PROTECTED,
WARNING | During maintenance operation, when CB1 (MBP) is closed and CB2 (UPS |
| ISOLATION) is open, each UPS control panel display will show a message |
| “LOAD PROTECTED” when the UPS is placed in |
| mode the critical load is not protected because it is supplied by the mainte- |
| nance bypass power. |
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4 — 8 | Operation |