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Appendices
A1 Electrical Characteristics
Selection of Protection Devices
UPS with common normal and bypass AC inputs
UPS unit with separate normal and bypass AC inputs
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%, -15% from the UPS rated output voltage.
2. Bypass frequency greater than ±2 Hz from the UPS rated output frequency.
Downstream
circuit breaker
(not supplied)
Upstream
circuit breaker
(not supplied)
Upstream
circuit breaker
(not supplied)
Main
Input
Bypass
Input
Q4S
Q1
Battery CB
Inverter
Bypass
Static Switch
Output
Q3BP
Q5N Load
PFC
Boost
Rectifier
Downstream
circuit breaker
(not supplied)
Upstream
circuit breaker
(not supplied)
Main
Input
Q4S
Q1
Battery CB
PFC
Inverter
Bypass
Static Switch
Output
Q3BP
Q5N
Normal AC
Bypass AC
Load
Rectifier
Boost
Appendices
A — 1
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