Hubbell Industrial Controls, Inc.
Electric Fire Pump Controllers
Specifications for LXi 1100 Controllers * Solid State Soft-Start/Stop * July 2002
The fire pump controller shall be factory assembled, wired, and tested as a unit assembly, shall conform to the
requirements of the latest editions of NFPA-20 and NFPA-70, and shall be Listed/Approved by and bear the label of
UL/FM. The controller shall be Hubbell-Lexington LXi 1100 equipped with LXi logic.
The controller shall be of the combined manual/automatic type and be furnished in a floor mounted drip-proof steel Type
2 enclosure with lifting eyes. The enclosure shall be red with a non-glare surface. The controller shall be for solid-state
soft-start starting and designed, tested, and marked for the rated horsepower and 3-phase voltage and frequency in a 40
degree C. ambient.
The soft-start controller shall include a full-wave three-phase controlled, open loop starting assembly consisting of control
logic and a separate three-phase full-wave (anti-parallel) SCR thermistor assembly. The control logic shall be conformal
coated and carry a 5 year warranty. Circuit adjustments and LED indicators shall be in the front of the control logic for
accessibility and indicating.
The SCR controller shall be designed and rated to carry locked rotor current (600% of FLA) for 20 seconds as required by
NFPA 20. SCR’s rated for 500% for 10 seconds shall not be acceptable. The SCR’s utilized in the thermistor assembly
shall have a minimum 1200 volt PIV rating and Dv/Dt protection including 100 joule minimum MOV’s per phase.
The solid-state starter shall supply a reduced voltage which will increase to full voltage along an acceleration ramp,
adjustable between 0.5 and 10 seconds. The controller shall include a motor contactor bypass for the SCR unit when full-
voltage has been reached, or in the event of overheating of the SCR unit.
For normal stopping situations the controller shall initiate a stop sequence through the solid-state unit. The starter shall
decrease the voltage applied to the motor via an adjustable deceleration ramp (between 0.5 and 10 seconds) to a preset
adjustable voltage level. The starter shall hold at this voltage level for an adjustable time period between 3 and 60
seconds to monitor for another starting cause. The deceleration/minimum speed hold feature of the controller provides
reduced hydro-mechanical stress in the system piping. If no new starting cause occurs during the decerlation/minimum
speed period the controller will decelerate the fire pump to a full stop. The “Soft Stop” pushbutton shall cause the
controller to initiate the same stop sequence through the solid-state starter. The “Emergency Stop” push button shall
cause the controller to bypass the solid-state starter deceleration and stop immediately.
The soft-start module shall be provided with the following indicating diagnostics:
Power Available Green LED Controller Initiate Blue LED
Acceleration Yellow LED Run Yellow LED
Deceleration Yellow LED Minimum Speed Yellow LED
Emergency Stop Blue LED Shorted SCR Red LED
All electrical components shall be accessible from the front for maintenance and service. No components or component
wiring shall be permitted on the door of the enclosure. The controller shall have a common operating handle for both the
line isolating switch and the controller circuit breaker mounted in the enclosure flange. The minimum withstand rating for
the fire pump controller shall be 150,000 amps RMS symmetrical at 200-600volts. The unit shall be Listed/Approved
with UL/FM as “Suitable For Use As Service Equipment”.
The controller shall have separate and independent pressure settings with minimum run timing capable of a setting of up
to 10 minutes. Settings of the pressures shall be established at the time of the field acceptance test. Provisions shall be
included to allow manual or automatic shutdown in the field.
(4 pages)
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