• Designed to maintain a constant pressure output from the fire pump
• A variable frequency drive (VFD) is used to vary the speed of the fire pump’s electric motor, taking into consideration the constant pressure output required.
• The variable speed drive will ramp up the electric motor speed to obtain the desired constant pressure output in maximum 10 seconds.

• Single operator for both isolating switch and circuit breaker
• Surge arrestor
• Locked rotor protector
• Line reactor 5%
• Mode Selector Switch
  • VFD
  • Bypass
• VFD Fault and VFD Bypass visual indication
• Start and stop pushbuttons
• Run test push button
• Emergency start handle
• Phase reversal indication
• Remote start / deluge valve start provision
• Pressure transducers and run test solenoid valve externally mounted
• Audible alarm
• Alarm contacts for remote indication
• Available with automatic transfer switch

• Built to NFPA 20 (latest edition)
• Underwriters Laboratory (UL)
  • UL218 – Fire pump controllers
• FM Global – Class 1321/1323

• ViZiTouch V2.1 operator interface
  • Voltage and amperage display
  • Constant pressure output set-point display
  • System pressure, cut-in and cut-out display
  • VFD Hertz display
  • Pressure and event recorder

• NEMA 12 ventilated assembly
• Conductor entry gland plates
• Lifting lugs
• Doors with keylock handle and quarter-turn latches
• Red RAL3002
• Powder coated / glossy textured finish

• Surge suppression
• Disconnecting means
  • Single operator for both isolating switch and circuit breaker
  • Door interlocked in the ON position
• Locked rotor protector
• Visual indications
  • Alternate (emergency) isolating switch in the OFF position
  • Alternate (emergency) voltage phase to phase
  • Transfer switch in normal position
  • Transfer switch in Alternate (emergency) position
• Transfer switch test pushbutton
• Bypass for re-transfer and generator shutdown
• Electrically operated and mechanically held in the normal or alternate position
• Provision for manual operation

Time delays:

•  To override momentary normal power outages before transfer to the alternate (emergency) power source. Factory set at 3 seconds.
• To retransfer to normal power. Instantaneous retransfer in case of alternate (emergency) power failure. (Factory set at 5 minutes.)
• To allow engine generator cool-down after retransfer to normal source. Factory set at 5 minutes.

Voltage, frequency and phase reversal sensing:

•  Voltage sensing on all phases of normal power, set at 85%. A voltage below this value or phase reversal initiates transfer to the alternate (emergency) power source.
•  Alternate (emergency) power source voltage and frequency sensing set at 90%. A voltage or frequency above this value initiates transfer to the alternate (emergency) power source.
•  Voltage sensing on all phases of normal power, set at 90%. A voltage above this value initiates retransfer to normal power.

Remote alarm contacts

• Emergency power isolating switch in the OFF position
• Transfer switch in normal position
• Transfer switch in emergency position

Generator start connection