Installation (cont.)
Example of an installation comprising three modular UPSs with an external maintenance bypass (from 250 to 500 kVA)
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maintenance |
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bypass line |
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| Q3BP |
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| modular UPS cubicle 1 |
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| earth |
mains 2 |
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| switch |
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mains 1 | Q1 | rectifier | inverter 1 |
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| charger |
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| frames interconnection for earthing |
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earth | battery cubicle | QF1 | + | - | + | - | other battery | earth | |
beside rectifier- |
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| inverter cubicle 1 |
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| frames interconnection for earthing | |||
| modular UPS cubicle 2 |
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mains 2 |
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mains 1 |
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| load |
Q1 | rectifier |
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| inverter 2 |
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| charger |
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earth | battery cubicle | QF1 | + | - | + | - | other battery | earth | |
beside rectifier- |
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| inverter cubicle 2 |
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| frames interconnection for earthing | |||
| modular UPS cubicle 3 |
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mains 2 |
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mains 1 | Q1 | rectifier |
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| Q5N |
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| inverter 3 |
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earth | battery cubicle | QF1 | + | - | + | - | other battery | earth | |
beside rectifier- | cubicles (if | ||||||||
| inverter cubicle 3 |
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Fig. 15
Important. The power cables between each UPS and the upstream protection devices must be the same length. The same holds for the power cables between each UPS cubicle and the external maintenance bypass.
6739381EN/
