Hubbell Industrial Controls, Inc. 

4301 Cheyenne Drive, Archdale, NC  27263 

Phone (336) 434-2800  •  Fax (336) 434-2803 

LXi-2900 Wye Delta Open Transition

LX-28/2900 Wye Delta Hubbell Fire Pump Motor Controllers with Automatic Transfer Switches (ATS) are designed to comply with the latest standard of the National Fire Protection Association for the installation and operation of centrifugal Fire Pumps (NFPA-20).

Model LXi-2900 is a combined automatic and manual wye-delta reduced current fire pump controllers applied where the capacity of the power source does not permit across-the-line starting of the motor. The controllers are used with special six (6) or twelve (12) lead squirrel cage motors designed for wye-delta starting.

The motor is started connected in wye, drawing approximately 33% of the locked rotor current and producing approx. 33% of its locked rotor torque. After a short time delay, the controller transitions the motor to the delta connection. The motor current & torque jump to the across-the-line current & torque at the speed at which the transition takes place. The current quickly falls to its normal running current as the motor accelerates to full speed.

The difference in the LXi-2800 and LXi-2900 is the transition between the wye and delta connections. The LXi-2900 has open transition between the wye and delta connections. This condition can cause current surges or disturbances back into the power source and can affect the operation of other equipment.

The LXi-2800 has closed transition between the wye and delta connections through the use of an additional contactor and resistor. The LXi-2800 provides a smoother transition by keeping power on the motor during the transition.

Drawings and Publications

Volts HP Range Dimensions Schematic Field
200-208 15-30 29DE0011 29DS0011 29DF0011 Pub. 193D
200-240 15-40
380-415 15-60
440-480 15-75
200-208 40-75 29DE0021 29DS0011 29DF0011 Pub 193D
220-240 50-75
380-415 75-125
440-480 100-150
200-208 100-150 29DE0031
Consult Factory
29DS0011 29DF0011 Pub 193D
220-240 100-200
380-415 150-300
440-480 200-400
For all controllers   45DS0011
45DF0011 Pub 201 ATS

Catalog Literature

LXi-2900 Specifications
July 2002
Brochure 6100M
May 2004
Price List 6100M
October 2002
Emergency Ratings

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