Samlex America PSE-12275A - Manual (Page 29)

OPERATION
Powering on the loads
After the inverter is switched on, it takes a finite time for it to become ready to deliver full
power. Hence, always switch on the load(s) after a few seconds of switching on the
inverter. Avoid switching on the inverter with the load already switched on. This may
prematurely trigger the overload protection.
When a load is switched on, it may require initial higher power surge to start. Hence, if
multiple loads are being powered, they should be switched on one by one so that the
inverter is not overloaded by the higher starting surge if all the loads are switched on at
once.
Switching the inverter on / off
Before switching on the inverter, check that all the AC loads have been switched off.
The on / off switch (a) on the front panel of the inverter is used to switch on and switch off
the AC power output of the inverter. This switch operates a low power control circuitry
which in turn controls all the high power circuitry.
CAUTION!
Please note that this switch is not switching the high power battery input
circuit. Parts of the DC side circuit will still be alive even when the switch is
in the off position. Hence, disconnect the DC and AC sides before working on
any circuits connected to the inverter
When the inverter is switched on, the green LED bar graph voltage indicator (d) will be
lighted and the voltage at the input terminals will be indicated. It should read between 12
to 13 volts if the batteries are fully charged.
Switch on the AC load(s). The green LED bar graph current indicator (d) will show the
current drawn by the inverter from the batteries. The value of the current drawn will be
proportional to the AC power drawn by the load. The voltage shown will decrease slightly
and this decrease will be proportional to the power drawn by the load
DC side input voltage and current display
Two LED bar graph indicators (d) indicate the voltage at the DC input terminals of the
inverter and the current drawn from the batteries. The voltage at the DC input terminals
will always be less than the voltage at the battery terminals due to the drop in voltage in
the battery side cables and connectors. When no load is connected to the inverter, the
voltage at the inverter terminals will be almost same as the voltage at the battery terminals.
If the batteries are fully charged, the voltage display should read between 12 to 13 Volts.
As the AC power delivered by the inverter increases, the value of the DC side current
display will increase. At the same time, the value of the voltage display will decrease due
to drop in the battery voltage on load and also due to the voltage drop in the DC side
cables.
Indications for normal operation.
When the inverter is operating normally and supplying AC load(s), only the voltage and
current displays will be on. In case of abnormal operation, other displays and alarms will
be activated. Please see under “Protections Against Abnormal Conditions” on page 29.
Page 28