"World's recognized authority in power treatment"

MD Series (3.1kVA - 7.5kVA)

The MD Series is a single phase, seamless transfer, uninterruptible power system providing premium power to various types of loads ranging from industrial to information technology. The overall function of the MD is to take polluted, fluctuating, and erratic electrical power that exists in all areas, and purify it or replace it (in the event of an outage), with well-regulated, clean, computer grade power.

Single Phase Sizes: 3.1kVA, 3.5kVA, 4.5kVA, 5.0kVA, 6.0kVA, 7.0kVA, 7.5kVA

Features & Benefits
Technical Specs

General Specifications

Guide Specifications

Back to top Top
Features & Benefits

  • Steady Regulated Voltage to +/- 3%
  • 100% Power Conditioning
  • No-Break Continous Power Providing Seamless Switching to Battery
  • Run Times Available up to 72 hours
  • Field Expandable Power Rating and Battery Run Time
  • 94% Efficiency
  • Computer Grade Electrical Isolation
  • Switch Mode Rated
  • Optional NetMinder Ethernet/MODBUS Adapter for Network Monitoring

Back to top Top
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% (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

Back to top Top

  • Networking LAN / WAN
  • Hosts / Hubs
  • Clusters
  • PACS-RIS For Medical Imaging
  • Information Technology
  • Telecommunications
  • CAD / CAM
  • Industrial Controls
  • Medical Labs
  • Doppler Radar Systems
  • Communication Closets
  • Voice Mail Systems

  • Is the MD a standby UPS?

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

  • How does the MD regulate voltage?

  • The MD 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 MD delivers regulated voltage to within +/-3% without using battery power.

  • How does the MD 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 60Hz, the power distortion of other frequencies will not be present in the output. The MD corrects for bad input voltage waveforms with distortion levels as high as 40%. Most standby UPS units will not tolerate over 7% distortion, they switch to battery backup. The MD preserves the battery power for only outages.

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

  • This question is asked very frequently and doesn't have a direct answer for the MD. The limited protection that a standby UPS offers is from its TVSS circuit. So the contest begins of who offers the most. The typical TVSS protection is no more than a couple of dime to nickel size metal oxide varistors (MOV) with ratings of typically 6,000 amp; leading even the experts to believe that these devices will handle 6000 amps. In contrast, the MD protects the load with 100 pounds or better of pure transformer steel. The transformer absorbs the high energy transients leaving the load solidly protected. In addition, it also replenishes the energy where notching and reverse spiking occur.

  • Is it true that the MD improves 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 feels gentler currents and produces much less heat; increasing its' efficiency and extending it's life.

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

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

  • How does the MD 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 and the list goes on. The MD'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 MD provide superior isolation compared to typical units of the same size?

  • Most stand-by UPS systems just pass the incoming power directly to load without any regulation, power conditioning and/or isolation. The MD uses a special ferro-resonant isolation transformer for power purification and isolation. Everyone knows when there is a power problem, get it isolated! The MD starts with isolation and stays with isolation; yes even on the battery.

  • Does the MD do anything to correct for load generated harmonics?

  • Yes. The MD's ferro-resonant transformer acts as a band pass filter, allowing only 60 cycles to pass. Load generated noise and harmonics are trapped in the output of the MD, preventing the unwanted harmonics from reaching the input power source. Standby UPSs simply don't do anything for harmonics; you live with the results.