MiniJet Pump doesn't shut off on DC-8

Kengar · 07/19/2007, 08:23 PM

Add MiniJet (606) to the list of low draw items that don't shut off on a DC-8.

gman19 · 07/20/2007, 05:02 PM

Does anyone know what minimum wattage one needs to make the DC8's SSR's switch reliably? I'm inclined to beleive that 7W is close to the threshold. I have a Tunze nanostream 6025 that would not switch on one outlet but will work every time on the adjacent outlet. The nanostream 6045's are supposed to pull 8W, but I have not installed them in the tank yet, so I don't know how they'll work. Should know in a day or two...

clp · 07/20/2007, 05:21 PM

It is not wattage that is the critical parameter. A 1 watt resistive load like an incandescent bulb will turn on/off correctly with the DC8 triacs. The problem is going to be isolated to inductive loads with poor power factors. These are usually very small pumps with no power factor correction.

Curt

kff · 07/20/2007, 08:37 PM

In that case, would it make sense to wire 1W resistors in future versions of DC-8, perhaps only on a couple of outlets? The power consumption / heat output of these resistors would be negligible.

RWillieK · 07/21/2007, 04:58 AM

I have two little tiny pumps (actually came out of those tabletop fountains). I have been considering using them for kalk top off and mixing.

Here are the specs:

Jebo 0.082 Amps, (no watts)
Eiko Electric 4 watts (no amps)

Think they will have a problem?

Robbie

gman19 · 07/21/2007, 12:07 PM

The installation of 1W resistors sounds like a good fix for this issue...any caveats Curt??

clp · 07/23/2007, 02:45 PM

It will likely solve the problem for these very small inductive loads. FYI, for a 1 W resistor the resistor value must be greater than about 15K ohms (Power = V^2/R).

Curt

07/19/2007, 08:23 PM	#1
Kengar Registered Member Join Date: Sep 2000 Location: Gaithersburg, MD (D.C. Metro Area) Posts: 1,970	MiniJet Pump doesn't shut off on DC-8 Add MiniJet (606) to the list of low draw items that don't shut off on a DC-8.

07/20/2007, 05:02 PM	#2
gman19 Registered Member Join Date: Jan 2006 Location: Greensboro, NC Posts: 425	Does anyone know what minimum wattage one needs to make the DC8's SSR's switch reliably? I'm inclined to beleive that 7W is close to the threshold. I have a Tunze nanostream 6025 that would not switch on one outlet but will work every time on the adjacent outlet. The nanostream 6045's are supposed to pull 8W, but I have not installed them in the tank yet, so I don't know how they'll work. Should know in a day or two... __________________ 100G AllGlass reef/Lifereef Filter Systems custom sump/skimmer/filter cylinders. 1/5 HP Aqualogic chiller, ACIII controller, Lifereef LCR1 Calcium Reactor. Current Tank Info: 100g reef/Berlin method

07/21/2007, 04:58 AM	#5
RWillieK Registered Member Join Date: Feb 2003 Location: Louisville, Kentucky Posts: 594	I have two little tiny pumps (actually came out of those tabletop fountains). I have been considering using them for kalk top off and mixing. Here are the specs: Jebo 0.082 Amps, (no watts) Eiko Electric 4 watts (no amps) Think they will have a problem? Robbie __________________ Five out of Four People have Trouble with Fractions. Current Tank Info: 90 gallon display, 40 gallon sump, 20 Gallon Fuge, AquaController Jr w/ Serial upgrade, Velocity T2 Return, Modified ASM G2 Skimmer, 2 x 150w 14K MH, Coralife Ca Reactor, DIY Kalk Reactor

07/21/2007, 12:07 PM	#6
gman19 Registered Member Join Date: Jan 2006 Location: Greensboro, NC Posts: 425	The installation of 1W resistors sounds like a good fix for this issue...any caveats Curt?? __________________ 100G AllGlass reef/Lifereef Filter Systems custom sump/skimmer/filter cylinders. 1/5 HP Aqualogic chiller, ACIII controller, Lifereef LCR1 Calcium Reactor. Current Tank Info: 100g reef/Berlin method

07/20/2007, 05:21 PM	#3
clp RC Sponsor Join Date: Aug 2001 Location: San Jose, CA Posts: 4,311	It is not wattage that is the critical parameter. A 1 watt resistive load like an incandescent bulb will turn on/off correctly with the DC8 triacs. The problem is going to be isolated to inductive loads with poor power factors. These are usually very small pumps with no power factor correction. Curt

07/20/2007, 08:37 PM	#4
kff Registered Member Join Date: Apr 2006 Posts: 57	In that case, would it make sense to wire 1W resistors in future versions of DC-8, perhaps only on a couple of outlets? The power consumption / heat output of these resistors would be negligible.

07/23/2007, 02:45 PM	#7
clp RC Sponsor Join Date: Aug 2001 Location: San Jose, CA Posts: 4,311	It will likely solve the problem for these very small inductive loads. FYI, for a 1 W resistor the resistor value must be greater than about 15K ohms (Power = V^2/R). Curt