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
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