General Precautions Personal Precautions Features; Protection Circuitry; Automatic Low Battery Cut Out; Automatic High Battery Cut Out - Trace Engineering LEGEND II Manual

All Legend Series II inverters include extensive protection circuitry, Search Sense Mode, Impulse
Phase Correction, true RMS voltage regulation, crystal-controlled timing, three-stage battery
charging, and an internal AC transfer relay.
The inverter is protected from high-battery voltage, low-battery voltage, over-heating, and over-
current conditions. When the inverter senses one of these situations, it will protect itself by
disconnecting from the loads, and will signal an error condition by a red flashing of the LED indicator.
The low-battery cutout, high-battery shut down, and over-temperature protection circuitry resets
automatically. If an over-current condition continues for more than 20 seconds, the inverter will
shutdown and must be reset with the power button. If the error condition is remedied before the 20-
second period has elapsed, the inverter will automatically reset.

Automatic Low Battery Cut Out

The Legend inverter/charger protects your batteries from damage caused by over-discharging by
automatically shutting itself off when battery voltage falls to a preset level. This feature is called the
Low Battery Cut Out ( Auto LBCO) . Your Legend inverter/charger comes from the factory with the
Auto LBCO enabled; LBCO voltage is set at 11.1 volts. You can adjust the cutoff voltage to 8.5 volts
( Auto LBCO disabled) using the optional RC7 remote control. See The RC7 Remote Control section
on Page 62 for more information about the configuring LBCO.

Automatic High Battery Cut Out

When battery voltage rises above 15.6 volts, the inverter shuts down to protect electronics that may
be operating off of it (high battery voltage results in high AC peak voltage). The inverter automatically
resumes operating when battery voltage drops below 15.6 volts. High battery voltage can occur only
through using an unregulated charging source, such as an unregulated solar or other DC generator
or alternator. To remedy this problem, disconnect any external charging sources.

High Temperature Cut Out

The inverter is protected from overheating due to excessive loading or charging. When the internal
temperature of the inverter exceeds its design limits, the inverter will disconnect itself and shut down.
After a sufficient cooling period, the inverter will automatically reset and resume operation. Some
causes of high internal temperatures include excessive loading, high ambient temperatures,
inadequate ventilation, and an inoperative cooling fan. To remedy, reduce loads or reduce ambient
temperatures by relocating, insulating, and/or ventilating the inverter enclosure (See the Installation
section on Page 23 for more information).
WK