Samlex America SA-1500 - Manual (Page 17)

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3-7-5. Set the power switch to the ON position. Check the meters and
indicators on the front panel of the inverter. The voltage bar graph
should indicate 11 to 14 volts (22 to 28V when 24V version is used)
depending on the voltage of the power source. If does not, check
your power source and the connections to inverter.
The other indicators should be off.
3-7-6. Set power inverter switch to the OFF position, the indicator lights may
blink and the internal alarm may sound momentarily.
This is normal. Plug the test load into the AC receptacle on the front
panel of the inverter. Leave the test load switch off.
3-7-7. Set power inverter switch to the ON position and turn the test load On.
The inverter should supply power to the load.
If you plan to accurately measure the true output r.m.s. voltage of
inverter, a meter such as FLUKE 45 BECKMAN 4410 or TRIPLETT
200 must be used.
WARNING!
You may observe a spark when you make this
connection since current may flow to charge
capacitors in the power inverter.
Do not make this connection in the presence of
flammable fumes Explosion or fire may result.