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Old 11/13/2017, 02:47 PM   #1
Vinny Kreyling
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Join Date: Nov 2002
Location: Miller Place, NY
Posts: 4,810
What did I do wrong?

I read the manual a few times but ???
I wanted to slow down the RD 80W Speedy for a water change.
Well the speed dropped really fast & then the pump shut down,
dn showed on the controller.
No problem, seemed better than just pulling the plug.
I have been able to restart & control the flow without incident, BUT--
I can no longer use a GFCI outlet.
The outlet is no longer usable after playing around with different ways to run the pump. A new plug does not work either so I now use a regular grounded 3 prong outlet.
Any thoughts?


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250 gallon mixed reef, Vertex Illumina LED, RD 3 Speedy 80 Watt, DAS EX-3 Skimmer, MTC mini cal, 2-3/4" Sea Swirls, Aquacontroller & 4 Tunze pumps.
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Old 11/13/2017, 03:59 PM   #2
slief
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Join Date: Sep 2009
Location: Simi Valley, Ca
Posts: 12,349
Quote:
Originally Posted by Vinny Kreyling View Post
I read the manual a few times but ???
I wanted to slow down the RD 80W Speedy for a water change.
Well the speed dropped really fast & then the pump shut down,
dn showed on the controller.
No problem, seemed better than just pulling the plug.
I have been able to restart & control the flow without incident, BUT--
I can no longer use a GFCI outlet.
The outlet is no longer usable after playing around with different ways to run the pump. A new plug does not work either so I now use a regular grounded 3 prong outlet.
Any thoughts?
I dont think you did anything wrong. Some GFCIs and variable speed pumps often dont play nice. Even though it might have worked for a bit, variable speed pumps create differential voltage which can trip many GFCIs. If you do a google search on variable speed pump trips GFCI, you will find lots of stories about this scenario. Also, GFCIs become more sensitive over time. I personally will not run GFCIs on my system for this reason. I have 2 GFCIs in my kitchen. One will trip from different pumps and the other will not. There are commercial grade GFCIs that have a 20ma trip sensitivity which usually are fine as are AFCIs and or ELCB breakers which are better suited for this. GFCI breakers are often a bit better as well but most run GFCI recepticals which are really sensivive. Siemens also makes good GFCI breakers that are less sensitive to variable speed pumps and are much better suited for our use than GFCI recepticals IMO and experience.


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Current Tank Info: 480G display mixed reef, 90G sump, 90G refugium, 60G display refugium. Check out my build thread: http://www.reefcentral.com/forums/showthread.php?t=1783476

Last edited by slief; 11/13/2017 at 04:10 PM.
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