It stands for Reverse Blocking Insulated Gate Bipolar Transistor. Reverse-parallel connection of RB-IGBT enables both way switching. It is incorporated in Fuji Electric’s exclusive AT-NPC (Advanced T-type Neutral Point Clamped) 3-level inverters, to increase the power conversion efficiency because there are less current passing elements.
Our UPSs work ideally with lead-acid wet cells, VRLA batteries, lithium-ion batteries of all chemistries, and flywheels. NiCd batteries are also an option, contact the factory for more information.
Fuji Electric recommends two PMs per year, one “minor” PM to check batteries, and inspect the unit online, and one “major” PM to send the load to bypass, do a thorough mechanical inspection and cleaning, full diagnostic test, and of course inspect the batteries as well.
No, our AC and DC capacitors are designed for the life of the unit, and no regular replacements are required.
Yes, all of our products have redundant fans.
It depends on the thermal sensor mounted near SCR. When the thermal sensor operates, stop the SCR gate drive. Then, UPS will display “WARNING” on LCD, and store a log “TEMP ALARM (STS)”. In the case of the parallel redundant UPS, the UPS that detects the abnormal temperature is disconnected (parallel-off). And the normal UPS(s) […]
Yes. 2 fans are connected to one power supply. And 3 power supplies are connected to one control transformer.
Yes, 4 fans on the top and 2 fans on the front for SCR. Fuji has verified a single power supply failure. That means that 2 fans failure simulated.
No, it is not. Only one type of caution message is displayed. Please visually check it because you do not know which fan has failed.
Each fan has a speed alarm. When any one alarm is detected, UPS will display “CAUTION” on LCD, and store a log “CTR FAN ERROR”. CTR-M continues running.