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Fire Pump Controller Selection Table

Controller Type

Motor Type

Volts @ Motor

Line Current

Torque

Solid State Soft Start/Stop

Standard

0-100%

35-100%

0-100%

Across The Line

Standard

100%

100%

100%

Autotransformer

Standard

Taps at

50-65-80%

At those taps

25-42-64%

At those taps

25-42-64%

Primary Resistance

Standard

50%

50%

25%

Limited Service

Standard

100%

100%

100%

Part Winding

Special 2- windings

100%

65%

48%

Wye-Delta Closed Transition

6 or 12 Leads

100%

33%

33%

Wye-Delta Open Transition

6 or 12 Leads

100%

33%

33%

 

 

Solid State Soft Start/Stop

Controller is a combined automatic and manual soild 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 starting inrush is reduced to 25-50% of normal starting current through the use of silicon controller rectifiers (SCR's). 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 reachs 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 after all conditions that initiated the start return to normal, the by-pass contactor is opened and the controller 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 up to 60 seconds. When "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 "minmum speed" period a new starting condition occurs, the controller will immediately begin to re-accelerate the motor to full speed.

Number of wires required from Controller to Motor = Three (3)

Cost Index 210%

 

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Across the Line (Full Voltage)

Controller is a combined automatic and manual Across-The-Line Fire Pump controller, applied where the capacity of the power source permits full voltage starting of squirrel cage motors. These controllers do not limit inrush current or starting torque of the motor. To use this type of controller, the power source must be capable of suppling 600% of full load motor current, without dropping the voltage at the imput terminals of the controller by more than 15% of the rated voltage.

Number of wires required from Controller to Motor = Three (3)

Cost Index 100%

 

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Autotransformer

Motor is started with 3 phase autotransformer in primary to limit inrush. Multiple taps ( manually set) provide variable starting characteristics. Closed transition to full speed.

Number of wires required from Controller to Motor = Three (3)

Cost Index 200%

 

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Primary Resistance

Motor is started with resistance in each phase to limit inrush. Closed transition to full speed.

Number of wires required from Controller to Motor = Three (3)

Cost Index 150%

 

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Limited Service

Motor is started Across the Line with no additional impedance nor special connections to reduce inrush or starting torque.

Number of wires required from Controller to Motor = Three (3)

 

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Part- Winding

Motor is started on one of its 2 windings to limit inrush. Closed circuit transition to other winding at full speed

Number of wires required from Controller to Motor = Six (6)

Cost Index 140%

 

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Wye - Delta Closed Transition

Motor is started connected Wye to reduce voltage across the windings and reduce inrush. Closed transition to Delta winding at full speed.

Number of wires required from Controller to Motor = Six (6)

Cost Index 200%

 

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Wye - Delta Open Transition

Motor is started connected Wye to reduce voltage across the windings and reduce inrush. Open transition to Delta winding at full speed.

Number of wires required from Controller to Motor = Six (6)

Cost Index 146%

 

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Cost index is based off the list price differences ... based off a 100HP Motor @ 460 Volts

 

 

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Intended for information purposes only

 

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