Eaton Power Xpert 9395P-600/600, Инструкция по установке и эксплуатации, Страница: 145 / 226

Eaton ® Power Xpert ® 9395P-600 (300V-600V) Installation and Operation Manual 164000710—Rev 07 127
The internal bypass is comprised of a solid-state, silicon-controlled rectifier (SCR) static switch (SSW) and a
backfeed protection contactor K5. The static switch is rated as a continuous-duty device that is used anytime
the inverter is unable to support the applied load. The static switch is wired in series with the backfeed
protection contactor, and together they are wired in parallel with the rectifier and inverter.
The critical load is not protected from voltage or frequency fluctuations or power outages while the UPS is in
Bypass mode.
ATTENTION!
Les charges critiques ne sont pas protégées des fluctuations de tension ou de fréquence ni des pannes de
courant lorsque l’onduleur est en mode Contournement.
The static switch, being an electronically-controlled device, can be turned on immediately to pick up the load
from the inverter while the inverter output contactor K3 opens to isolate the inverter. The backfeed protection
contactor is normally always closed, ready to support the static switch unless the bypass input source
becomes unavailable.
Figure 63. Path of Current Through the UPS in Bypass Mode
Static
Switch
K5
r e tr e v n I r e if it c e R
K1 K3
Battery
Converter
Battery
Battery
Breaker
Main Power Flow
Trickle Current
Energized
De-Energized
Closed
Open
Breakers Contactors
K2
Bypass Input
Rectifier
Input
Output
Input
Breaker
(CB1
NOTE On a UPS configured as an IOM, the bypass input, static switch, bypass breaker (CB4), and K5 are not present.
NOTE On a UPS configured with a Continuous Static Switch (CSS), bypass breaker (CB4) is not present.
Understanding UPS Operation