Wye-Delta Closed Transition Start


Series MP435 - Combined Manual and Automatic
 

Metron Fire Pump Controllers conform to the latest requirements of National Fire Protection Association's Standard for Centrifugal Fire Pumps as adopted by Underwriters Laboratories and Factory Mutual. They are withstand rated and listed by Underwriters' Laboratories and approved by Factory Mutual Research Corporation.

Sizes range from 15 to 700 horsepower, 200 to 600 volts, 60 Hz. These controllers are for use on Reduced Voltage type installations.

Only the highest quality components, all UL listed or UL recognized, are used throughout to assure the best possible reliability. The cabinet is fabricated of heavy gauge reinforced steel with drip-proof hood. All field wiring and service connections may be made from the front, allowing the controller to be mounted flush against a wall.

The controller is completely wired, assembled, and tested at the factory before shipment, and ready for immediate installation.

Wye-Delta motors have all six leads brought out to the motor terminal box. These leads are connected by the contoller first in the Wye configuration which draws only 33% of normal starting current and develops 33% of normal starting torque. After a short time delay, the controller then connects the motor winding in a Delta configuration, applying full voltage and drawing full load running current and developing full running torque.

The MP435 closed transition types provide a smooth transition from Wye to Delta by keeping the motor continuously energized during the transition period. This is accomplished by means of resistors which are connected in the circuit during the momentary period of transition from Wye to Delta.

Metron Wye-Delta Controllers incorporate a mechanical as well as electrical interlock to prevent the Wye connecting contactor from being energized at the same time as the Delta contactor.

An emergency start lever to close starting contactor independent of automatic control circuits. When used, this lever will bypass the reduced current start feature and start the motor with full inrush current drawn from the power source

After a minimum run period and all starting causes have returned to normal, the solid state controller will initiate a stop sequence. This furncion will reduce surges in the pumping system during stopping a centrifugal pump by smoothly decelerating the motor at a selectable rate.

 

Outline and Hookup Drawings:


 

Without Transfer Switch

With Transfer Switch

Voltage

HP Range

Outline

Hookup

Outline

Hookup

200

15-60

CD33986D

CH33696D

CD33993F

CH34014F

75

CD33776C

CH34277C

CD33810D

CH33712F

100-150

CD33782C

CH34277C

CD33816D

CH33712F

200-250

CD33792C

CH33761D

CD35004 

 CH33729

300

CD35009

CH33761D  CD35014  CH33729

208

15-75

CD33986D

CH33696D

CD33993F

CH34014F

100

CD33776C

CH34277C

CD33810D

CH33712F

125-150

CD33782C

CH34277C

CD33816D

CH33712F

200-250

CD33792C

CH33761D

CD35004

 CH33729

300

CD35009

CH33761D  CD35014  CH33729

220-240

15-75

CD33986D

CH33696D

CD33993F

CH34014F

100

CD33776C

CH34277C

CD33810D

CH33712F

125-200

CD33782C

CH34277C

CD33816D

CH33712F

250

CD33792C

CH33761D

CD35004 

 CH33729

300

CD35009

CH33761D  CD35014  CH33729

380-415

15-125

CD33986D

CH33696D

CD33993F

CH34014F

150

CD33776C

CH34277C

CD33810D

CH33712F

200-300

CD33782C

CH34277C

CD33816D

CH33712F

350-400

CD33792C

CH33761D

CD35004

 CH33729

500-600

CD35009 

CH33761D  CD35014  CH33729

440-480

15-150

CD33986D

CH33696D

CD33993F

CH34014F

200

CD33776C

CH34277C

CD33810D

CH33712F

250-400

CD33782C

CH34277C

CD33816D

CH33712F

500

CD33792C

CH33761D

CD35004

 CH33729

600-700

CD35009 

CH33761D  CD35014  CH33729

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

  

 

 
 
 

 
Drawings are provided in ADOBE pdf Format and are provided for reference only. Drawings and Specifications subject to change without notice. Drawings should not be used for construction. Contact our sales department for specific as-built drawings for your special project.