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Controlling March Pumps and Heaters


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#1 alberto

alberto
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Posted 05 September 2012 - 10:49 AM

Hello, Im building a homebrew system and I want to control with a Labjack U3-HV, 3 Heaters, 5 Temperature Sensors, 3 water pumps and 3 level sensors. Heaters: Camco 02963 5000 W 240V Pumps: March 815 PL (0.04 HP, 115V/60 Hz) Temp. Sensor: EI1034 Temperature Probe Level Sensor: SRF02 Ultrasonic Sensor Im not sure wich Solid State Relays I need and how to connect them. Thank you

#2 LabJack Support

LabJack Support
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Posted 05 September 2012 - 02:11 PM

Here is a $20 SSR we often use that is rated for 280VAC/40A:

Jameco 176719

Note #1: This SSR is rated for 40 amps, but likely needs a heat sink to achieve that.

Note #2: Turning on/off inductive loads (e.g. motor) tends to create radiated and conducted EMI transients. This Kyoto SSR appears to do zero-cross switching, which will reduce EMI. Not sure if this SSR has a snubber to further reduce EMI. If you notice problems (e.g. USB communication errors that coincide with turning the motor on/off), you might need to find an SSR specifically rated for inductive loads.


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