Inverter User Manual
Version 1.14, June 2020
5
3.- INVERTER OPERATION
After switching ON the inverter, the unit carries out system checking sequences;
if an error is detected the failure cause will be shown on the LCD display and the Load
Disconnection LED Indicator will start to flash along with other LED indicators
(depending on the failure). This type of failure does not allow the inverter to function
properly therefore it will cut power supply to the load. As part of this self-test process
the internal inverter fan will run for 1 second.
After the self-test process, the AC output voltage will gradually increase from
zero to its nominal value (soft start). If the load detection circuit is active and does not
find loads greater than those predetermined, then the inverter will go into load detection
(stand-by) mode reducing its power consumption and checking again once per second.
When the battery voltage is lower than the “low battery voltage” setting, the
acoustic alarm is activated and the “low battery” LED alarm begins flashing once per
second. After 10 seconds this LED alarm will remain lit and the “Load Disconnection”
LED will turn ON too, indicating that the inverter has been shut-off. If the battery
voltage rises reaching a voltage above the predetermined restart voltage, the inverter
will automatically start and both LED will turn OFF.
If the battery voltage reaches 4/3 of the inverter rated battery input voltage (e.g.
16 volts in a 12 volt inverter) the “Battery Over Voltage” LED turns ON in conjunction
with the “Load Disconnection” LED causing the AC
output to shut-down. When the
inverter DC voltage input drops to a value lower than the re-start voltage setting, the
inverter will re-start automatically.
Inverters produce heat when operating. The amount of heat produced is
(almost) proportional to the amount of power supplied by the inverter. When the
MOSFET reaches a certain programmed temperature (50 ºC by default), the internal
fan is activated, stopping when the temperature drops below the preset temperature
limit (factory default is 40 ºC). However, if the temperature keeps on rising (because
the connected load is too high) and reaches 60 ºC, the output voltage will decrease by
10 % in order to reduce the power; if despite this the temperature keeps rising, the unit
will shut off when the temperature reaches 80 ºC, restarting again at 60 ºC. System
shutdown due to over temperature will be indicated by the corresponding yellow LED
alarm simultaneously with the “load disconnection” red LED (the screen also indicates
the cause of the load disconnection). While the system is disconnected due to over
temperature the fan will continue functioning.
In models with input control, if this is not activated, the inverter will shut down
and the “Load Disconnection” LED indicator will turn on. When it is activated, the
inverter restarts shutting off the correspondent LED alarm. Input control activation is
made by closing a circuit.
If a short-circuit is produced at the inverter output, the unit automatically limits
the output power to protect the installation, and the short-circuit LED lights up. If the
short-circuit lasts more than 10 seconds then the “Load Disconnection” LED will light
up and the inverter will stop. Once the cause of the short-circuit has been eliminated it
is necessary to reset the unit (using the ON/OFF switch) in order to recover the AC
output.
