On-line Technology
- Why the Need for Uninterruptible Power?
- Ten compelling reasons for buying a UPS
- Why every network needs a UPS
- Off-line (or Passive Standby)
- Line Interactive (or Active Stand By)
- On-line Technology
- Voltage Regulation
- Output Waveform
- Connecting a UPS to a network
- Remote Monitoring
- UPS management using SNMP
- The MGE Office Protection Systems MIB
- Com Port Settings
- Security vulnerabilities
Top-of-the-range technology for the centralized protection of servers
Operating diagram
On-line technology has changed a great deal in the last few years, resulting in a dramatic cut in the size of these products. Contrary to what many people believe, an On-line UPS does not supply output current from its battery at all times. The current is completely regenerated by its transformation from AC to DC and then back to AC, thus guaranteeing a constant level of quality, regardless of disturbance on the mains power source.
Oms Transfer time makes the On-line technology mandatory for critcal applications: medical and industrial processes for example.
The On-line technology is the MGE Office Protection Systems trademark for 40 years, with products like Pulsar, Pulsar M and Pulsar MX.
Filtering capacities
By carrying out continuous double conversion, an On-line UPS significantly attenuates electrical disturbances, which might otherwise damage a computer, forming a natural barrier. This possibility is not available on Standby UPSs, which explains why an On-line device will always deliver better filtering capacity than Line Interactive or Off-line UPSs.
Automatic bypass
Theoretically, this system guarantees the supply of electricity to the load in the event of a fault on the UPS. In fact, although this function is implemented on the largest high power UPSs, it is not fully implemented on small devices on account of the cost of the technology involved.
The principal use of the bypass is to absorb startup inrush currents and to deal with output overloads. When a UPS uses its bypass, the load is no longer protected, which may result in other problems, particularly if there is no galvanic isolation.
Manual bypass
The other bypass function is intended for maintenance work: it is used to power down the UPS without interrupting the power to the load. It is thus possible to work on a faulty UPS in complete safety. This function is of no use on a UPS which is replaced by a standard exchange unit when it requires repairs as it is necessary to stop the load in order to replace the UPS.
Eaton Comet EX RT, for which servicing is carried out on-site, on the various sub-assemblies, is fitted with a manual bypass. Problems related to long battery-backup timesTelecommunications applications, for instance, require very long battery-backup times, from 6 to 8 hours. Only On-line UPSs can guarantee proper operation under these conditions. This operating mode places continuous demands on all UPS components, as is always the case on an On-line UPS. On the other hand, a Line Interactive is not designed to operate for so long in battery mode, which may result in overheating problems and premature wear of the UPS.