1.0 INTRODUCTION
The LM/LMOPT Central Inverter System integrates the latest power
electronics and microprocessor technology and produces a pure sine wave
power output intended for use in Emergency Lighting. The system is very
efficient on-line and typically has a standby power loss of only 2 percent of
the systems total capacity. This high efficiency and the ability to turn lighting
loads on and off using the optional switched load outputs make it ideal for
energy saving and green initiatives. It is UL-924 compliant for Self-Testing and
Self Diagnostic which automatically performs internal tests and then records
them in a backup logs. The MMI (Man Machine Interface) consists of a 5
button keypad and backlit LCD display which is very powerful and feature
rich. Users can access all stored logs and diagnostic tools such as meter
functions, they can also change alarm functions and much more.
1.1 Mechanical Design Features
This product was designed having the electrical installer in mind. Batteries
are Front Access type which simply slide into the cabinet and connect with
Busbar jumpers. They are easy to install, safe and less prone to installation
errors. The AC connections are also easily made with the contractor landing
the inputs and outputs to either Circuit Breakers, terminals of busbars.
Contractor piping for conduit is easily accomplished with multi-sized
knockouts on both sides and tops of the cabinet so wires can easily run into
the cabinet and connected to ground bars, neutral bars and circuit breakers.
The machine has an attractive Powder Painted 14 gauge Cold Rolled Steel
construction with no visible outside bolts or rivets. Internally, it has all
galvanized or painted steel parts for all the modules and shelves that resist
corrosion and provide durability and high quality.
1.2 Electrical Design Features
Through the use of Pulse Width Modulation (PWM) and the latest IGBT and
MOSFET technology, the LM/LMOPT Series can produce a pure sine-wave
output which is compatible with all types of lighting loads. A high crest factor
of up to 4X is extremely beneficial for high-inrush loads and also ideal for
bringing Normally-Off lighting loads on from a cold start. Since the active
PWM regulation scheme produces a very low THD waveform, the LM/LMOPT
Series can power up even the most demanding loads driving its output with
power factor capabilities ranging from 0.5 leading to 0.5 lagging.
Adding to the versatility are the multiple output types of Normally-On,
Normally-Off and Switched. The batteries are charged by a temperature
compensated charger integrated into a bi-directional converter. A three-rate
charging scheme and bi-directional converter topology ensures maximum
float life and minimal ripple current on the batteries.
LM/LMOPT SERIES | 3
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