Mashmate Relay Capacity?help

[pokolbinguy]

Guys,

I am getting my leco mate to check the wiring of my mashmate and he noticed that the diagram on the controller mentions the relay current capacity is rated differently in seperate areas of the paper work.

Unit states 17(5A)/250VAC as does the "Mashmaster" paper work....HOWEVER the paper that was supplied by the manufacture of the unit states the heater output relay is 10A/250VAC

So.......what is correct??? Will this uni safely switch my heating element (kitchen kettle element) without burning down my house???

Cheers, Pok

 

[LethalCorpse]

Odd...got a photo or scan you can show me?

 

[rclemmett]

Does it say 10A (resistive)?

 

[pokolbinguy]

Odd...got a photo or scan you can show me?

This is the paperwork that came with unit in addition to MashMasters instructions


This is the bit I am referring to:

Does it say 10A (resistive)?

Unit says on the small diagram 17(5A)/250VAC.


So confusion reigns at the moment.

 

[rclemmett]

Whats your element? ie 1000watts 1200watts 2400watts, etc.

 

[pokolbinguy]

Whats your element? ie 1000watts 1200watts 2400watts, etc.

1850-2200 W kettle element. Taken from a coles kitchen kettle.

I have seen others on here use them with a MashMate controller without an additional relay...but just want to check.

 

[rclemmett]

Watts = Volts * Current.

So (1850 to 2200) / 240 = 7.7 to 9.2 Amps.

If your relay is rated to 10A and you element draws less than that I would hazard a guess that it will be fine. Your sparky mate should be able to confirm that for you.

 

[pokolbinguy]

It was just that the diagram on the unit shows 17(5A)/250v which made him a little skeptic.

 

[rclemmett]

It was just that the diagram on the unit shows 17(5A)/250v which made him a little skeptic.

Was he big before he read it :blink:

That is odd. Google time.

 

[mesa]

Hmm, I didn't notice the diagram on the unit and just went of the paper, however I can tell you that I have used my Mashmaster to drive a kettle element of the 1800-2200 W variety for a number of brews and it hasn't blown up (yet ;-)). Having said that I would expect the unit to have a significantly higher capacity than whats its rated to, so maybe thats just good luck.

 

[LethalCorpse]

I'm pretty sure those are surge and continuous current ratings, though they can give different numbers for resistive versus inductive loads, or for make/break/continuous currents. I'd be inclined to assume the worst, that it's only rated to 5A.

 

[brettprevans]

Pok - why not flick Frank from mashmster en email rather rely on us armchair electricians

 

[pokolbinguy]

Pok - why not flick Frank from mashmster en email rather rely on us armchair electricians

Done

 

[mika]

Franks in China at the moment, so might take a while to respond. I asked him about it at one stage and apparently the relay is good for 15A, he claimed he was getting the specs revised, perhaps he hasn't gotten around to it.
I've run a 2400W element on my HLT for ~25 brews and the unit hasn't caused any issues. Since then I've run it as control on a relay only as I re-read the instructions and got worried...hence the question to Frank.

 

[rclemmett]

Looks like you've moved on but looking at the wiring diagram http://mashmaster.com.au/UserFiles/2321-Fi...nstructions.pdf (assuming same unit) the 5A is on the switch not the heating element. ie it can only switch on a 5A load without damaging its contact.

But I would ask the guy who sells them, as he should know how the things work.

 

[pokolbinguy]

Reply from MashMaster was:


10 amps will give you 2400W with no problems, as far as the difference between the instructions and the display sticker, I will quote directly from the manufacturer.
The correct relay capacity for DEI-106H is 17amps, however, we consider the product safety, therefore, we recommend using for up to 10amps. In order to confusing users, we will revise the relay capacity in the wiring diagram and make both documents are in 10amps.

So looks like all is well

Cheers, Pok

 

[Screwtop]

Reply from MashMaster was:


10 amps will give you 2400W with no problems, as far as the difference between the instructions and the display sticker, I will quote directly from the manufacturer.
The correct relay capacity for DEI-106H is 17amps, however, we consider the product safety, therefore, we recommend using for up to 10amps. In order to confusing users, we will revise the relay capacity in the wiring diagram and make both documents are in 10amps.

So looks like all is well

Cheers, Pok

Have used one with an 1800W resistive load (hot water element) in my HLT for over 100 brews and another with a 2200W resistive load (kettle element) via a 30A/240V relay for 47 brews without failure. If you want to be sure use a relay they're not costly, available from Jaycar.

Screwy

 

[pokolbinguy]

Have used one with an 1800W resistive load (hot water element) in my HLT for over 100 brews and another with a 2200W resistive load (kettle element) via a 30A/240V relay for 47 brews without failure. If you want to be sure use a relay they're not costly, available from Jaycar.

Screwy

Screwy,

If I am to put a relay in. What type should i get (as in model etc, so i can buy it and get my leco mate to install)?? and where in the circuit should it be installed.

Cheers, Pok

 

[schooey]

yeah that's good advice. You can always use the unit to switch a high load contactor up to 40A+, as long as you have the supply to handle it

 

[schooey]

Pok,

A contactor is esentially an electro-mechanical relay as Screwy said, and on one side of the contactor there is a coil that your mash mate would energise to make it switch. On the other side you would have an active in from your power source, and an active out to your element. Your lecco mate should be very familiar with these.