PROTECTION SYSTEMS
The WF-5318 and WF-5320 inverters include protection features that ensure safe operation and
recovery from a wide range of fault conditions.
When a protection feature is activated, the inverter will sound an audible alarm to indicate that
output power has stopped. In the case of the battery voltage approaching its limit, the alarm will
provide a warning sound before the power actually stops. Fault alarms may continue for up to
one minute.
Overload
If too much current or too much power is drawn by the load on the inverter, it will stop. The
design includes considerable margin for providing momentary inrush current to start motors
or other dicult loads. But if the overload continues for a longer time (which depends on the
amount of overload), then the unit will stop to prevent equipment damage. The remedy is to
reduce the load on the inverter, so that it can operate. After 40 seconds, the inverter will
automatically attempt to restart. You can also turn the inverter o and on to restart it sooner.
Under or Over Voltage at Input
If the battery input voltage drops below 11 volts, the alarm will sound to warn of a low battery
voltage. If the voltage drops below 10 volts, then the inverter will stop.
If the battery input voltage is above 15 volts, the alarm will sound to warn of a high battery
voltage. The inverter will stop if the input is above 16 volts.
Over Temperature
An excessively high temperature inside the inverter will cause the inverter to stop. When the unit
cools down, it will restart once. If overheating persists after that, it will remain o. If it is cool
enough, manually cycling the power switch can restart operation.
Short Circuit
A short circuit on the ac output – that is, if the line and neutral output are accidentally
connected together – will cause the inverter to stop. After the problem is corrected, the inverter
can be restarted.
Dc Reverse Polarity
Be very careful when connecting a battery to the dc system. It is usually very critical that the
polarity is correct because some equipment may be permanently damaged if the polarity is
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