28 | INSTALLATION / OPERATION MANUAL
7.0 SYSTEM OPERATION
7.1 Startup Mode
When the LM/LMOPT Series is first turned on using the System ON/OFF switch, it goes
through a sequence of self-tests which ensures proper connections are made and also checks
for faults that may be present. The inverter must qualify several things before advancing to
the Battery Charging mode. There will be two distinct clicks of relays as it goes through the
self-check sequence. After all the Start-Up diagnostics are performed, the LM/LMOPT Series is
OK to proceed to the Battery Charging mode.
7.2 Battery Charging Mode
The Battery Charging mode is where the system will remain for most of the products life.
In this mode, AC power is being passed from the INPUT AC through to the OUTPUT AC and
subsequently its loads are being powered and the internal battery charger is maintaining a
float charge. The charger is regulating or floating the batteries at 2.26
Volts per Cell (VPC) and is temperature compensated to 4mV per deg. C (per cell), centered at
25 °C. For higher temperatures, float voltages go down. For lower temperatures, float voltages
go up.
7.3 Inverter Mode
Inverter Mode can have several other names such as Emergency Power and Battery Power
Mode. This terminology may be used throughout this document.
During Inverter Mode, the inverter is producing a pure sine wave for the output loads and the
batteries are being discharged. The output current is limited by an active pulse by pulse
current limit technique and prevents the inverter from failure.
In the event of an overload there are several ways that the inverter will protect itself. First is
the pulse-by-pulse limit and second is by average sensing. The pulse-by-pulse is a transient
protection and occurs in the micro-second time scale, the average sensing looks at a heavily
filtered signal and occurs in the seconds time scale.
Due to the high crest factor on the LM/LMOPT Series, loads that have high inrush currents
are quickly up and running. This is very beneficial with Switched or Normally-Off loads. The
Normally-On and multipurpose Normally-Off/Switched outputs all produce voltage during
Inverter Mode.
7.4 Normally-On Output
There is one Normally-On Output located on the terminal block and is labeled N-ON. The
Normally-On Output is energized 24/7 as long as the system is powered on.
7.5 Normally-Off/ Switched Output
Normally-Off outputs are energized only during an Emergency condition or when the system
test button is pressed.
Switched outputs are controlled by applying an AC voltage to the Switched Command. These
output types function as an interface to energy saving controls such as time clocks, daylight
harvesting, photo-sensors, occupation sensing or lighting control systems.
NOTE - When the LM/LMOPT Series changes mode of operation from Charge Mode to the
Inverter Mode, ALL output types will automatically energize regardless of the state of the
Switched Command Input.
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