Specifications

NAIROBI OPERATIONAL HUB
UNOPS Building, UN Lane, Off UN Avenue Tel: [phone]
P.O Box 783,Village Market, 00621 E-mail: [e-mail]
Nairobi, Kenya Website: www.unops.org
UNOPS is ISO 9001 certified
the batteries, up to 10 min time or until restoration of the normal
power supply. The operation and control for the UPS shall be
provided through the use of microprocessor controlled logic. The
system shall provide an alarm indication 10 minutes before the reserve
power failure and shall provide automatic shutdown of the non essential
equipment at the end of a programmable time.
PART 4 MODES OF OPERATION
The UPS shall be designed to operate in the following modes:
4.01 Normal
The critical load shall be continuously supplied by the inverter. The
rectifier/battery charger shall derive power from the utility AC source
and supply DC powers to the inverter while simultaneously float
charging the battery.
4.02 Emergency
Upon failure of the utility AC source the critical load shall be supplied by
the inverter, which without any switching, obtains its power from the
storage battery. There shall be no interruption to the critical load upon
failure or restoration for the utility A/C sources.
4.03 Recharge
Upon restoration of the utility AC source, the rectifier/battery charger
powers the inverter and simultaneously recharges the battery. This
shall be on automatic function and shall cause no interruption to the
critical load.
4.04 Bypass Mode
If the UPS must be taken out of service for maintenance or repair of
internal failures or in cases of heavy output overload, "the static bypass
transfer switch" transfers the load to the alternate source without an
interruption. Retransfer to the load shall be accomplished after the UPS
inverter automatically synchronizes to the alternative bypass source.