Galaxy PW™ UPS 100 to 225kVA
CAUTION | Work should be carried out in accordance with applicable safety regulations. to |
| avoid interrupting the load, the various switching operations must be carried out |
| in the correct order. Operations are explained in diagrams placed next to the |
| switches. the system cabinet is only partially powered down. The load is still |
| supplied via the bypass AC source and switch Q3BP. |
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5.3Steps for Parallel UPS Redundancy to Increase Output
CAUTION | PARALLEL UPS WITH EXTERNAL MAINTENANCE BYPASS During mainte- |
| nance 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 |
| critical load is not protected because it is supplied by the maintenance |
| bypass power. |
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First Isolate all UPSs: (Refer to section 5.2, page
See Figure
Proceed in the following order: (See Figure
1.Shut down the inverters (press the "inverter OFF" buttons 8 for three seconds).
2.Close switch Q3BP and open switch Q5N in the external bypass unit.
3.Open switches Q1, QF1, and Q5N on the UPS units.
Figure
78
| Galaxy PW |
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| Q1 | Q4S | Q5N | Q3BP | 0 | 1 | 0 | 1 | |||
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0 | 0 | 0 | Q5N | 0 | 0 | ||||||
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5 |
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6 | 0 | 0 | 0 |
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5 — 4 | Maintenance |