Uninterruptible Motor Drives - UMD

Unique Selling Points

Full availability 

UMD^TM provides continuous operation of 3-phase AC motors, with no interruption during utility power disturbances. In normal operation the Variable Frequency Drive (VFD) is supplied from mains. During a brown out or mains outage the VFD is powered from a battery connected directly to the DC-bus of the VFD. The transition between the power sources is completely seamless, meaning no speed drop during any disturbances of the mains supply.

Eliminates Single Point of Failure 

The UMD^TM system is designed to remove all Single Points of Failure. Traditional UPS systems must be doubled or excessively oversized to achieve the same safety level.

In-line Integrated VFD’s allow precise motor control

UMD^TM utilizes field-proven, high-quality VFD’s. All the advantages of VFD operation also applies to the UMD^TM. That includes: limiting start currents, starting at maximum torque, precise speed control, energy savings etc. At Direct On Line start of an induction motor, the inrush current can be up to 9 times of the nominal current. The UMD^TM with its internal VFD solves the problem and realize the motor’s full potential.

UMD^TM adds black-start capabilities

When a motor operation is backed up by traditional UPS systems, starting up often relies on the availability of utility power. When secured by UMD^TM, the motors can start up without utility power. This can be done with full torque and full speed as normal start-up. There is no need for a bypass or alternative mains to handle the starting current. Absence of utility power poses no limitations for black-start.

Complete factory tested UMD^TM system

UMDTM is delivered as one complete MCC-unit. Type tested according to IEC, UL, CSA and other applicable standards. The system has single or redundant mains input breakers, battery charger, AC and DC busbars, and the required motor drive outputs. In addition, it can be extended to backup all AC and DC auxiliary loads.