Always On GES-1003NX, Operator'S Manual, Page: 43 / 66

Always
O
n UPS Systems
M0703_NX_Series_Operators_Manual V1.25 2012-06-12 37
8.4 From Manual Bypass To Inverter Procedure
After the maintenance procedures and testing are complete you will need to restore the UPS
back to its normal mode of operation without interrupting the power to the loads.
The following procedures need to be followed.
a.
Close all fuse holders
– ensure all fuse holders behind the control module are closed. Fans
will start spinning.
b.
Close the reserve breaker
– Wait 15 seconds for the reserve and output LED on the status
panel to light up, indicating the reserve static switch loop is energized and there is power
on the output terminals. The power supplies within the UPS will also energized and the
internal fans will rotate.
c.
Open the bypass breaker
– The inverter cannot be switched on when the maintenance
bypass breaker is closed (because the CPU will sense the breaker and prevent the inverter
from connecting directly to the AC source). The reserve breaker is already closed so power
goes through the reserve loop if the bypass breaker is open. AC power at the output will not
be interrupted.
d.
Close the rectifier breaker
- The rectifier initiates automatically if the AC utility power
connected is with in operating parameters. The DC voltage will slowly rise (15 – 30 sec.)
until the designated voltage is reached. The DC voltage is now ready for the inverter and
battery cabinets.
g.
Close the battery fuse holder
- A fuse holder is employed from the battery to the DC bus for
safety purposes. The batteries will start charging once the fuse door or breaker is closed.
This fuse holder can be located within the UPS system or within the battery cabinets.
h.
Push inverter on switch
– To turn on the inverter simultaneously press the inverter on
switch ( ׀ ) and the control switch ( ◄► ). The inverter will start working and the inverter
output will be established in 4 sec. The load will automatically transfer to the inverter 3 sec.
later. The UPS is now operating in normal mode.
e. Check the status panel is correct, as shown in the diagram on the previous page. All
warning LED’s on the right hand side are off, two LED’s: ‘INVERTER ON’ and ‘INVERTER
STATIC SWITCH’ on the left hand side should be lit, and the LED’s circle should also be lit.
If the load is over 70%, the ‘70% LOAD’ LED will also be lit.