Wye-Delta Open Transition Start


Series MP430 - 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 (480 volts max. when supplied with transfer switch), 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.

With the M430 open transistion types, there is a very short period of time where no voltage is applied to the motor during transition from Wye to Delta connections. This condition can cause current surges or disturbances fed back into the main power source. The magnitude of the surges is proportional to the phase difference between the voltage generated by the running motor and the power source. These transients can in some instances affect other equipment which are sensitive to current surges.

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 is provided to close the starting contactors 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

 

Outline and Hookup Drawings:


 

Without Transfer Switch

With Transfer Switch

Voltage

HP Range

Outline

Hookup

Outline

Hookup

200

15-60

CD33985D

CH33695D

CD33992F

CH34013F

75

CD33775C

CH34276C

CD33809D

CH33711F

100-150

CD33781C

CH34276C

CD33815D

CH33711F

200-250

CD33791C

CH33760D

CD35003

CH33728

300

CD35008

CH33760D CD35013 CH33728 

208

15-75

CD33985D

CH33695D

CD33992F

CH34013F

100

CD33775C

CH34276C

CD33809D

CH33711F

125-150

CD33781C

CH34276C

CD33815D

CH33711F

200-250

CD33791C

CH33760D

CD35003 

CH33728 

300

CD35008 

CH33760D CD35013 CH33728

220-240

15-75

CD33985D

CH33695D

CD33992F

CH34013F

100

CD33775C

CH34276C

CD33809D

CH33711F

125-200

CD33781C

CH34276C

CD33815D

CH33711F

250

CD33791C

CH33760D

CD35003

CH33728 

300

CD35008 

 CH33760D CD35013 CH33728 

380-415

15-125

CD33985D

CH33695D

CD33992F

CH34013F

150

CD33775C

CH34276C

CD33809D

CH33711F

200-300

CD33781C

CH34276C

CD33815D

CH33711F

350-400

CD33791C

CH33760D

CD35003 

CH33728

500-600

CD35008

CH33760D CD35013 CH33728

440-480

15-150

CD33985D

CH33695D

CD33992F

CH34013F

200

CD33775C

CH34276C

CD33809D

CH33711F

250-400

CD33781C

CH34276C

CD33815D

CH33711F

500

CD33791C

CH33760D

CD35003

CH33728 

600-700

CD35008 

CH33760D CD35013 CH33728 

 

 
 
 

MP430 Submittal Packages
Voltage
HP Range
200
15-60
75
100-150
200-250
300
208
15-75
100
125-150
200-250
300
220-240
15-75
100
125-200
250
300
380-415
15-125
150
200-300
350-400
500-600
440-480
15-150
200
250-400
500
600-700

MP430 w/MTS Submittal Packages
Voltage
HP Range
200
15-60
75
100-150
200-250
300
208
15-75
100
125-150
200-250
300
220-240
15-75
100
125-200
250
300
380-415
15-125
150
200-300
350-400
500-600
440-480
15-150
200
250-400
500
600-700


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