Appendices
A1 Electrical Characteristics
Selection of Protection Devices
UPS with common normal and bypass AC inputs
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| Q3BP |
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| Bypass |
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| Q4S | Static Switch |
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Upstream |
| PFC |
| Downstream | |
circuit breaker |
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| circuit breaker | ||
(not supplied) Main |
| Boost |
| (not supplied) | |
Q1 | Rectifier Inverter | Q5N Output | |||
Input | Load |
Normal AC |
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Bypass AC | Battery CB |
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UPS unit with separate normal and bypass AC inputs |
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| Q3BP |
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Upstream |
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circuit breaker | Bypass |
| Bypass |
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(not supplied) | Q4S | Static Switch |
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Input |
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Upstream |
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| Downstream |
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| PFC |
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| circuit breaker | |
circuit breaker |
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Main |
| Boost |
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| (not supplied) | |
(not supplied) | Q1 | Q5N |
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Input | Rectifier Inverter | Output | Load | |||
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Battery CB
NOTE: Interrupted Transfer to Bypass Source:
If the bypass source is beyond the conditions stated below, the UPS will make an interrupted transfer (not more than 100 msec. in duration).
1.Bypass voltage greater than +15%,
2.Bypass frequency greater than ±2 Hz from the UPS rated output frequency.
Appendices | A — 1 |