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LTR Series (700VA - 2.1kVA)

The LTR Series is a rack-mounted, single phase, seamless transfer, uninterruptible power supply. This product provides premium power to various types of loads, including industrial and information technology. The overall function of the LTR is to take polluted, fluctuating, and erratic electrical power and purify it or replace it (as in a blackout), with well-regulated, clean, computer-grade power.

Single Phase Sizes: 700VA, 850VA, 1.0kVA, 1.2kVA, 1.4kVA, 1.6kVA, 1.8kVA, 2.1kVA

Features & Benefits
Technical Specs

General Specifications

Guide Specifications

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Features & Benefits

  • Steady, regulated voltage to +/- 3% provides proven performance and extends the life of your equipment.
  • Highest level performance sinewave output matches your system's requirements.
  • 100% power conditioning.
  • No-break, continous power provides seamless transfer to back-up power, and prevents data loss.
  • Field-expandable power ratings, and optional extended battery runtimes.
  • Built-in, computer-grade, power purifying isolation transformer protects the load from even the most-damaging power disturbances.
  • User-friendly status and diagnostic indicators.
  • Optional NetMinder Ethernet/MODBUS adapter for network monitoring

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Technical Specs

  • Voltage Regulation: +/- 3%
  • Load Regulation: Typically better than +/- 3%
  • Overload Capability: 125% for 10 min
  • Surge Capability: 150% of rated output
  • Input Operating Range: +10 to -40% of nominal voltage (typical)
  • Input Current THD: < 10%
  • K-Factor: 30 or better
  • Operating Temperature: 0°C to 40°C
  • Common Mode Noise Attenuation: 120dB
  • Transverse Mode (Line) Noise Attenuation: 70dB
  • Spike Attenuation: 3000:1
  • Crest Factor: 3.5:1

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  • Networking
  • High-Performance Workstations
  • Voice Mail / Information Technology
  • Communication Closets
  • Transmission Repeaters
  • Supervisory Control and Data Acquisition (SCADA) Systems
  • Distributed Control Systems (DCS)
  • Critical Instrumentation
  • Point-of-Sale Computers

  • Is the LTR a standby UPS?

  • No. The LTR uses seamless transfer, ferro-resonant technology to secure optimum performance. Unlike standby systems that do nothing until power fails; the LTR conditions, regulates, and filters the power 100% of the time. The load receives a steady, spike-free, sinewave voltage, regardless of whether the incoming power is in or out of acceptable range.

  • How does the LTR regulate voltage?

  • The LTR incorporates a highly-efficient ferro-resonant transformer that produces a steady output voltage over a wide range of input voltages. Even in severe brownout conditions, the LTR delivers regulated voltage to within +/-3% without using battery power.

  • How does the LTR correct for bad power?

  • The ferro-resonant transformer remains in the power circuit 100% of the time. Since the transformer is designed to pass only 60 cycles (50 cycles also available, if required), the power distortion of other frequencies will not be present in the output. The LTR corrects for bad input voltage waveforms with distortion levels as high as 40%. Most standby UPS units will not tolerate over 7% distortion, and they switch to battery backup. The LTR preserves the battery power for outages only.

  • What level of TVSS protection is offered by the LTR?

  • The limited protection that a standby UPS offers is from its TVSS circuit. The typical TVSS protection is no more than a couple of "dime" to "nickel-sized" metal oxide varistors (MOV), with ratings of typically 6000 amps; leading one to believe that these devices will handle 6000 amps. In contrast, the LTR protects the load with 15+ pounds of pure transformer steel. The transformer absorbs the high-energy transients, leaving the load solidly protected; and also replenishes the energy where notching and reverse spiking occur.

  • Does the LTR improve the operation of equipment connected to it?

  • Yes. The output filter circuit removes unwanted frequencies generated by non-linear loads. This phenomena lowers the high load current demand and improves the power factor. The load draws less current and produces much less heat; increasing its efficiency and extending its life.

  • How does the LTR correct for ground noise, when other UPS's of similar VA sizes do not?

  • The LTR uses a high-level isolation, ferro-resonant transformer for power conditioning. Only an isolation transformer removes common mode noise (the noise generated on the ground lead). Most other UPS's use an auto transformer for some voltage correction functions, and ignore the need for common mode noise attenuation.

  • How does the LTR correct for improper site wiring?

  • Site wiring is always an unknown. There may be voltage variations, ground current that causes disruptive operation (unsolvable with TVSS), mixed grounds, etc. The LTR's ferro-resonant power purification transformer generates the equivalent of a new power source dedicated to the load. It creates a new clean ground reference, and establishes a central ground point for all loads. The new ground assures the data spike attenuation networks are at the most optimal location (the shortest lead length to ground).

  • How does the LTR provide superior isolation, compared to typical units of the same size?

  • Most standby UPS systems just pass the incoming power directly to the load without any regulation, power conditioning, and/or isolation. The LTR uses a special ferro-resonant isolation transformer for power purification and isolation. The LTR isolates power, even when operating on battery.

  • Does the LTR correct for load-generated harmonics?

  • Yes. The LTR's ferro-resonant transformer acts as a band pass filter, allowing only 60 cycles to pass (50 cycles also available, if required). Load-generated noise and harmonics are trapped in the output of the LTR, preventing the unwanted harmonics from reaching the input power source. Standby UPS's simply don't correct for harmonics.

  • Does the LTR fit in a standard 19" rack?

  • Yes.