MULTI DIALOG 10-80kVA MDM, MDM-AF and MDT, MDT-AF Series

An Uninterruptible Power Supply (UPS) for the power protection of corporate wide and large network applications. The Riello UPS Multi Dialog Uninterruptible Power Supply range is the ideal solution for computer and telecoms users wanting a flexible multiple operating format power system with advanced communications features.

There is a 19" rackmount format product 10-30kVA and version with a built in isolation transformer for critical applications requiring Galvanic isolation - 10-20kVA.

10-20kVA single/single or three/single-phase
10-80kVA three/three-phase

Uninterruptible Power Supply with multiple operating modes

The Multi Dialog Uninterruptible Power Supply series UPS uses double conversion on-line technology (VFI) and has several other operating mode options. Multi Dialog AF systems incorporate an harmonic filter to achieve less than 4% harmonic distortion and a near perfect sinewave absorption from the mains.

In on-line mode the load is powered continuously by the inverter to remove sags, surges and brownouts, through EMI filters to suppress transients, spikes and electrical noise. Even on bypass the load is routed through the filters so that the load is not connected to raw mains.

When the mains fails, the inverter which is constantly powering the load simply draws power from the internal battery to provide complete protection.

UPS Operating Modes

As well as the its on-line operating mode, Multi Dialog can operate in:

Economy Mode: uses Line Interactive (VI) technology to power less critical loads from the mains supply for certain periods. The function can be set from the front panel keypad or remotely using software
Smart Active: if the mains supply is out of range, the UPS will power the load from the inverter as an On-line UPS. When the mains supply returns to within range again, the UPS will monitor this for a certain period before selecting Line Interactive operation
Standby/Off: for security applications like emergency lighting where the UPS is switched on but the loads are powered through the bypass supply. When the mains fails or falls outside a preset range the inverter automatically powers the load. This operation is similar to that of a standby uninterruptible power supply.
Frequency conversion: 50 or 60Hz
Automatic Voltage Stabiliser: voltage stabilisation with the inverter and battery completely disabled.

Extended Runtimes

As the inverter is rated for continuous operation this type of uninterruptible power supply can be used to support large loads for long runtimes up to and over 7 hours or more in duration. This can be achieved using battery extension packs that connect in series to the rear panel connector on the UPS and/or a generator. When battery extension packs are used these may have their own mains powered chargers to maintain a reasonable recharge time of the complete battery set. For larger loads consider the Master Dialog.

Whatever the runtime installed there should be sufficient time for the protected computer systems to be shutdown in an orderly manner using the PowerShield software, supplied as standard, for Windows 95, 98, 2000, 2003, Me, XP, Mac OSx, 9.x, Linux NT 4.0 operating systems. Additional remote monitoring can be achieved using PowerNetGuard on Wide Area Networks or the Telenetguard remote service monitoring system with text alerts for site problems, and the wide range of NetMan SNMP interfaces and MultiCom adapters available.

Advanced Communication

advanced, multi-platform communication, for all operating systems and network environments: PowerShield supervision and shut-down software included, with SNMP agent, for Windows 95, 98, 2000, 2003, Me, XP, Mac OSx, 9.x, Linux, NT 4.0, Novell operating systems. The UPS is equipped with a cable for direct connection to the PC (Plug and Play)
double RS232 serial port
network adapter slot for SNMP agent
EPO (Emergency Power Off) shut down input contact
remote control panel

Features

reliable, filtered, stabilised and regulated sinewave output (double on-line conversion technology VFI according to EN50091-3 specifications) with filters for atmospheric disturbance suppression
high reliability: IGBT technology, full microprocessor control with no-break static and manual bypasses
0.8 power factor makes Multi Dialog suitable for powering ICT and industrial loads
high level diagnostics: event log with 128 messages, states, measurements and alarms - available from the built-in LCD in several languages
the UPS may be configured with the RS232 serial port (flash up gradable)
power factor correction with sinusoidal input to ensure a low impact on the mains supply for the single-phase/single-phase series
reduced noise levels: high frequency inverter bridge used (>16 kHz: above audible range)
low power consumption up to 92% in On-line mode due to the use of IGBT technology and up to 98% in the other operating modes: “Economy Mode”, Smart Active Mode, and Standby/Off Mode.
low harmonic pollution in the Multi Dialog CLEAN (AF series) the electronic digital (DSP control) active filter achieve a very low total harmonic distortion (THDi<4%)
compact cabinet (internal option)
high reliability (failure of the active filter does not affect UPS operation)
high efficiency: the active filter does not reduce operational efficiency
simple to install:
- capability to connect the UPS both to single-phase and three-phase mains supplies
- panel to offset voltage drop down long cable runs
- castors for ease of movement (models 10-30kVA)
maximum reliability and power availability - connect up to 8 units in parallel or N+1 redundancy, even of different power ratings
power factor correction (input power factor, close to 1)
high level battery reliability:
- automatic battery test
- recharge compensated for temperature
emergency operation: the UPS can be set to operate only when the mains fails (for emergency lighting)
back feed protection: to avoid energy feeding back into the mains supply
by pass may be deactivated to allow operation as a frequency converter (at 50 or 60 Hz)
easy to maintain (front access)

Summary

For UPS maintenance plan and warranty details see our service pages or download a copy of the latest powerUPS and SystemCare UPS service and repair brochure.