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Author Topic: Using SR227 receptacle to control a pump motor  (Read 6324 times)


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Using SR227 receptacle to control a pump motor
« on: June 29, 2006, 01:34:02 PM »

Since my pump motor is only 8 amps, I assume I can use a 15 amp rated receptacle.   I'm confused since it also says up to 1/3 horsepower and my pump is more than that.


Dan Lawrence

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Re: Using SR227 receptacle to control a pump motor
« Reply #1 on: June 29, 2006, 03:20:35 PM »

Here's what I have on the SR227:  The SR227 Wall Receptacle Module is the way to go if aesthetics and high wattage loads are of primary importance. This module replaces any existing wall receptacle outlet and responds to commands from any X10 controller. The top outlet is switched on and off by X10 signals. The bottom outlet is always on.

The XPR Wall Receptacle Module is a similar device to this except that BOTH outlets are X10 controlled. The XPR2 Wall Receptacle Module is a 240 VAC version of this device.

Features: rated at 15 amps and 1800 watts unrestricted load.

Hope this helps.
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Re: Using SR227 receptacle to control a pump motor
« Reply #2 on: June 30, 2006, 09:33:07 PM »

Well I will jump in here and also do some searching to be sure I get my facts right. You have basically 3 types of loads. Resistive, capacitive and inductive. A light bulb would be resistive, Some types of power supply's would be capacitive and motors inductive.

In a resistive circuit, voltage and current are in phase (most efficient)
In a capacitive circuit, voltage leads current (and varies as capacitance changes)
In an Inductive circuit, voltage lags current. (sucks up power and changes with drag on motors and speed and stuff like that)

these out of phase conditions can be monitored and that is why you see some shops with lots of equipment using motors also having banks of capacitors. The value of the caps combined with the inductive load brings the current - voltage phase separation back together making things more efficient. (helps keep the power meter from spinning out of its socket)

Sometimes you will see high voltage lines that run for miles, just suddenly criss cross each other. Power companies use the capacitance of the air space between the lines to help keep current and voltage close to each other. The ideal end result if I remember right is at the end of the transmission line they want voltage leading current a little bit. It helps reduce voltage line loss at the other end from the source.

Typically electric motor startups slingshot voltage - current phase shifts way far out of wack creating large current spikes. Thats one of the reasons they rate electrical devices in amps and HP. Also why they have capacitor start motors.

The formula for the above information is... ((Learned this when young + 35 years) / beer) - brain cells = I think I got this right.
« Last Edit: June 30, 2006, 09:39:29 PM by KDR »
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Brian H

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Re: Using SR227 receptacle to control a pump motor
« Reply #3 on: July 01, 2006, 06:58:36 AM »

KDR; That is also why many modules {X10 and Others}. May have a rating tag with three ratings. Resistive Inductive and Incadescent lights. OK on the lights it is the large surge current before the filaments warm up and the current goes back to normal.
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