Created Date: May 14,2016

Created by: Mario

Guys, I have a cabinet with limited space and am trying to figure the small footprint device to energize a pool pump type motor.

I'm confused about labeling on this motor. There are two stickers. Name plate and HP sticker above it.

Based on part number on nameplate, this should be a 3/4Hp motor, however, the sticker above it lists it as 1/2HP.

I'm going to go worst case scenario and use 3/4HP numbers for my calcs.

I ran the calcs, and it looks like my max inrush current is 19.5Amp , and according to nameplate the running current of 6Amp

Here is calc: solve ((343.5*1000)=220*x*1.73),x

This is type L motor: http://powertips-elec.blogspot.com/2010/11/motor-starting-and-running-currents-and.html

In this application, the motor will only start once a day and run for 8-10 hours. There is scenario where on windy days it might start multiple times (nanometer in place).

Cost between the 2 choices is not a factor (and it should never be one in properly designed solution).

I'm looking at 24.3mm width for the 782 relay base, vs 45mm for the CWC016-10-30L03 mini contactor. That's almost twice the width.

Looks like the 782 is rated for 1/2hp at 120VAC & 1hp at 277VAC. Since I'm using 220VAC, I should be comfortably somewhere around 3/4hp range.

Amperage is rated at 15A for 120VAC and 12A for 277VAC, so again 11.2Amp rated amperage is met.

http://www.automationdirect.com/static/specs/78relays.pdf

http://www.automationdirect.com/adc/Shopping/Catalog/Motor_Controls/WEG_Electric_Miniature_Contactors_(3-Pole)/16_Amp_(AC3)/CWC016-10-30L03

What would you guys do?

Created Date: May 15,2016

Created by: Mario

Don't worry about figuring your amps when buying a starter. Use the HP rating on the starter. Personally I wouldn't use a 782 relay for a motor. I normally use the Fuji manual motor starter with a Fuji contactor for my motors, no matter how small the motor.

Throw some part numbers my way if you can so I know where to start looking.