Always
O
n UPS Systems
M0703_NX_Series_Operators_Manual
V1.25
2012-06-12 34
8 OPERATION
After all the cables have been connected and power is present at the input terminal, the UPS is
ready to operate. Before initial start-up, re-check the following:
a.
Make certain there is no foreign material left on, inside or around the UPS
b.
Ensure all breakers and the battery disconnect switches are
opened
c.
Ensure all loads are switched off.
d.
Check that the input frequency matches the UPS’s rated input frequency
e.
Check that the input voltage matches the UPS’s rated input voltage
8.1
Switch On Procedure
(Authorized Trained Personnel ONLY)
These start-up procedures can be preformed with the AC utility source connected to or with
only the batteries connected.
a.
Close the input breaker
– Energize the transformer.
b.
Close the reserve breaker
– The reserve and output LED on the status panel will 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 energize and the internal fans will rotate.
c.
Close the rectifier breaker
- The rectifier will automatically start if the AC utility power
connected is within 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 bank.
d.
Close the battery breaker
- A breaker between the battery to the DC bus is used for safety
purposes. The batteries will start charging once the breaker is closed. This breaker can be
located within the UPS system or within the battery cabinets depending on rating.
e.
Push inverter on switch
– To turn on the inverter simultaneously press the inverter on
switch (
׀
) and the control switch (
◄►
). The inverter will begin to function with inverter
output within 4 sec. The load will automatically transfer to the inverter 3 sec. later. The UPS
is now operating in normal mode.
f.
Check the status panel for correctness as shown in the diagram on the next 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.
