LFTM Series Single Phase Inverter

GENERAL

Design
• Stand-by no break. PWM inverter type utilizing IGBT
technology with 2ms transfer time
Control
• Microprocessor controlled, 4 x 20-character display with
touch pad controls & functions
• Continuous scrolling display of system status and faults, with
alarm feature
Metering
• Input and output voltage, battery voltage, battery and output
current, output VA, temperature, inverter wattage
Communications Optional RS-232 port (DB9)

ELECTRICAL INPUT

Voltage
120 or 277VAC, 1-phase 2-wire, +10%/ -10%
Contact factory for all other voltage.
Input power walk-in
Limiting inrush current to less than 125%,
10 time for 1 line cycle for incandescent loads
Input frequency 60Hz, +/-3Hz
Protection Standard input circuit breaker
Harmonic distortion <10%
Power factor 0.5 lag/lead

ELECTRICAL OUTPUT

Voltage 120 or 277VAC, 1-phase 2-wire
Contact factory for all other voltage
Static voltage
• Load current change +/-2%, battery discharge +/-12.5%
Dynamic voltage
• +/-2% for +/-25% load step change, +/-3% for a 50% load
step change, recovery within 3 cycles
Harmonic distortion <3% THD for linear load
Output frequency 60Hz +/- 0.05Hz during emergency mode
Load power factor 0.5 lag to 0.5 lead
Inverter overload 115% for 10 minutes, 150% for 16 line cycles
Protection Standard output circuit breaker (normally on)
Crest factor <=4.5

ENVIRONMENTAL CONDITIONS

Storage/transport
• -4ºF to 158ºF (-20ºC to 70ºC) without batteries
• 0ºF to 104ºF (-18ºC to 40ºC) with batteries
(max. 3 months at 104° F (40° C)
Operating temperature
System operates safely from 32°F to 104°F (0°C to 40°C)
UL924 listed to provided 90 mins of battery back up between
68° F and 86°F (20°C to30°C). Battery performance can be
affected by temperature
Altitude <10,000 feet (above sea level) without de-rating
Relative humidity 0 to 95% non-condensing
Audible noise 45 dBA @ 1m from surface in emergency mode

Cabinets

Single freestanding or wall mount NEMA Type 1 steel cabinets powder
coated for corrosion and scratch resistance. Front access design. Top and
left side conduit entry with knockouts.

Inverter

Using IGBT/PWM technology the inverter converts the DC voltage supplied
by the batteries to AC voltage of a precise stabilized amplitude and
frequency, suitable for most sophisticated electrical equipment. True
sinusoidal output waveform with very low distortion (less than 3% for linear
loads). Overload capability of up to 150% for 16 line cycles.

Charger

Fully automatic, temperature compensated, microprocessor controlled
charger recharges fully discharged batteries in maximum 24 hours at
nominal AC input voltage. AC input current limiting and over-voltage
protection included.

Battery

System is provided with 10 year, maintenance free, sealed valve regulated
lead calcium batteries. 90 min. standard discharge time at full load under
normal operating temperature. Low voltage disconnect protection included.
No special ventilation required.

Self-diagnostic

Automatic self-test consists of a 5-minute monthly and 90-minute
annual function. The front-mounted control panel includes a 4-line
20-character display, a keypad to control and monitor the internal
operation of the system. This allows the operator to easily "watch”
system functions as they occur and check on virtually any aspect of
the system’s operation. Self-diagnostic function monitors, controls,
generates alarms and memorizes events.

Alarms

High/low battery charger voltage, high/low AC input voltage, near low
battery, low battery, load reduction fault, output overload, high ambient
temperature, inverter fault, output fault, optional output circuit breaker trip,
charger fault, output overload shutdown.

Optional features

Normally off output, output circuit breakers, output trip alarm, RS232
communication port, remote meter panel, remote summary alarm panel,
summary alarm dry form C contact, inverter on dry contacts, variable time
delay, bypass relays, wall mount bracket, circuit breaker lock, battery
temperature monitor, drip top (NEMA 2), internal/external maintenance
bypass switch, output transfer delay, serial to ethernet adapter, battery
strapping, zone monitoring, floor mount bracket, BACnet MSTP, BACnet IP,
Modbus TCP/IP, Modbus RTU.

Factory start-up

Includes one additional year of warranty. See warranty conditions

Warranty (full limited warranty conditions available upon request)

Limited manufacturer warranty is one-year, parts and labor, for system
electronics or two-year with factory start-up program. Battery warranty is
one year full plus 9 years pro-rata for a total of 10 years, under normal
operating conditions. System must be put in service within 180 days from
ship date in order to validate warranty.