Hubbell Industrial Controls, Inc. 

4301 Cheyenne Drive, Archdale, NC  27263 

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

LXi-2100 Soft Start/Stop with ATS

Reduced Voltage Starting Fire Pump Controller


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-2100 is a combined automatic and manual solid state reduced voltage soft start/stop fire pump controller, used when the capacity of the power source does not permit full voltage starting of the motor. The controller is used with standard three (3) lead squirrel cage motors.

The starting inrush current is reduced to as low as 40% of normal starting current through the use of silicon controlled rectifiers (SCR's) - see curves on back page. The SCR's control the applied voltage to the motor in a smooth, stepless manner, reducing the hydro-mechanical stress within the system piping. The acceleration rate is field adjustable between 0.5 — 10 seconds. When the motor reaches full speed, or after 10 seconds, a by-pass contactor closes, removing the solid state starter from operation.

After a "minimum run"; time of 10 minutes at full speed, and all conditions that initiated the start return to normal, the by-pass contactor is opened and the LXi-2100 reduces the applied voltage decelerating the fire pump motor to the "minimum speed" level (approximately 25% of full speed). The controller holds the motor at this "minimum speed" level for a period of up to 60 seconds. When the "minimum speed" period expires and no new starting conditions have occurred, the controller will decelerate the fire pump motor to a stop.

If during the "deceleration" period or the "minimum speed" period a new starting condition occurs, the LXi-2100 will immediately begin to re-accelerate the motor to full speed.

A manual "emergency run" operator is supplied for emergency starting. When the operator is pushed "On", the motor starts and runs at full voltage until the operator is pushed "Off".

Drawings and Publications

Volts HP Range Dimensions Schematic Field
200-208 15-50 21CE0011 21CS0011 21CF0011 Pub 193C
Pub 201 ATS
220-240 15-50
380-415 15-100
440-460 15-125
200-208 60-150 21CE0021 21CS0011 21CF0011 Pub 193C
Pub 201 ATS
220-240 75-200
380-415 125-300
440-480 150-400

Catalog Literature

LXi-2100 Specifications
July 2002
Brochure 6100M
May 2004
Price List 6100M
October 2002
Emergency Ratings
LX-450 Schematic
LX-450 Field Connection

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