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
Once the source is synchronized, the static bypass transfer switch shall
transfer the load from the by-pass source to the UPS inverter to ramp
into the load and then disconnecting the bypass input source.
4.05 Maintenance Bypass/Test Mode
Internal switches shall be provided to isolate the UPS inverter output
and static bypass transfer switch output from the AC bypass input
source and the load. The switches shall enable the UPS inverter and
static bypass transfer switch to be tested without effecting load
operation.
4.06 Downgrade
If the battery only is to be taken out of service for maintenance, it shall
be disconnected from the rectifier/battery charger and inverter by
means of a circuit breaker. The UPS shall continue to function as
specified.
4.07 UPS System Rating
The UPS system shall be as shown on drawings at rated voltage, for a
minimum autonomy of 10 minutes for the computer equipment.
The UPS shall be able to supply 125% rated load for at least 10
minutes.
4.08 Electrical Characteristics:
Input Rectifier a. Voltage : 3Ph + N400 / 230V
b. Tolerance ± 20%
c. Frequency : 50Hz ± 5% (Auto Sensing)
d. Input power factor correction
4.09 Output Inverter
a. Voltage : 3Ph + N400 / 230V
b. Tolerance stable condition ± 1.5%
c. Overall harmonic distortion on linear load: <1%
d. Phase angle accuracy for 100% unbalanced load ± 2%
e. Frequency: synchronize to mains (47-53 HZ for 50 HZ nominated)
f. Free running output frequency accuracy ± 0.01%