Is this pump motor running hot?

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A

archjeb

0
May 22, 2017
68
Portland/OR
New pump install, Hayward Power-Flo Matrix which is a Century 1.5HP motor.

Outside ambient temp is 78degrees F. The IR Temp scan of the body of the motor is hot to the touch... @134degrees F.

Doesn't that seem a little hot?
The old 1HP motor definitely was cooler...


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Assuming you are measuring surface temperature, in the shade, at air temperatures less than
90 F, I would give this as a rough guide:

Below 135 F, good
135 to 150 F, warm
Over 150 F, too hot.

Check the amps and volts.
 
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Yep, surface temp of motor. It was after sun down...so yes on shade..or no sun for that matter. 78degree ambient outside temp after sundown.

121VAC. Will have to check on the amperage/current draw...need to make a break out cable so I can clamp around a single conductor for that.

Thanks.
-J
 
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Pool-pump motors, especially single-speeds, run too hot for most people to keep their hand on for any length of time, generally in the 140-150 f range.
From a motor site:
Motor temperatures limits are mainly based on bearing, lubricant, and winding thermal capability. The winding limit is given by the temperature class of the insulation system. For example, 266 degrees F, for class B, and the bearing and lubricant upper limit is usually around 212 degrees F. To determine if a motor is running hot, we need to measure the winding temperature. If the temperature is under the insulation class system rating, the temperature is acceptable.

That motor is a class B and design is that the case is usually 100+/- degrees cooler than the actual windings.
 
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The interior will be hotter than the exterior, so it's hard to tell from an exterior reading.

The amps on the label say 15 amps, but the actual should not be more than about 13 amps.

Also, the surface will vary at different points and you need to try to identify the hottest spot.


www.fluke.com

How to inspect a motor with a thermal imager

Seeing a motor’s heat signature under normal operating conditions—with at least 40 % of design load—can tell you a lot about its condition.
www.fluke.com www.fluke.com
 
This shows 147 degrees for a big industrial motor.

If you find localized hot spots, that can be an issue.

Usually, overheating will be accompanied by excessive amperage due to the heat produced.

If the amperage exceeds the motor label, then there is a problem.

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