Pressure limiting fire pump controllers

Model VPU

Pressure limiting fire pump controllers

• Automatic transfer switch for VPx Series
• Full service pressure limiting fire pump
• Controller connected to second utility
• Emergency power
• Micro-processor based

Controller protection level:

• Standard NEMA - UL - type 2

Operational temperature limits:

• 41ºF to 122ºF (5ºC to 50ºC)

Annunciator and LCD display

• Accessible without opening main door
• Normal and alternate power indication
• Transfer switch status indication
• Transfer switch bypass time delay, alarm reset and silence pushbutton

Micro-processor based logic control

• Mechanically protected and shielded

The transfer switch assembly includes:

• One Test push button to simulate a normal power failure. Pressing the Test push button for more than 3 seconds will initiate the transfer to 2nd utility power source.
  The retransfer to the normal power source is initiated automatically after 5 minutes.
• Time delays:
  To override momentary normal power outages before transfer to 2nd utility. 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 (if applicable). 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 2nd utility.
  2nd utility voltage and frequency sensing set at 90%. A voltage or frequency above this value initiates transfer to 2nd utility power.
  Voltage sensing on all phases of normal power, set at 90%. A voltage above this value initiates retransfer to normal power.