Hi Everyone,

I am a complete amateur, have been working as a Electrician on ships for a few years. Slowly but surely learning electronics. Anyhow I'm writing to ask for advice on a broken slushy machine. I found the resistor on the control board is burned up, I can no longer read the value to replace and don't have a diagram. There's a capacitor next to the resistor, the output of this part of the circuit drives the refrigerant compressor. Is this what they call a bleed off circuit?

 

Take pictures of it then we can assist you further..make model and the resistor..

 

Take pictures of it then we can assist you further..make model and the resistor..

 

Take pictures of it then we can assist you further..make model and the resistor..

It's Vevor slushy machine I don't have a manual haven't seen the name plate data.

 

Welcome to AAC!

It's Vevor slushy machine I don't have a manual haven't seen the name plate data.

If it's R1D, what makes you think it's bad? It looks like a 0 ohm resistor which shouldn't be able to dissipate enough power to cause it to open circuit. Have you measured it's resistance?

 

It is a zero ohm resistor and they are commonly used as fusible links. I have a processer card from a washing machine where a wire carrying 240v came loose and touched another connector - the result is an exploded resistor. However that doesn't look so burnt to me - is it open circuit or not?

 

Welcome to AAC!
If it's R1D, what makes you think it's bad? It looks like a 0 ohm resistor which shouldn't be able to dissipate enough power to cause it to open circuit. Have you measured it's resistance?

I did measure, it was in Mohms. Now that you're mentioning it, maybe it's not. It just kind of looked bad and the back of the board had some dis-coloration. Also the Compressor is not coming on..?

 

I did measure, it was in Mohms.

If you were measuring from the contacts on the resistor, it has opened.

 

If its burnt out and its the feed to the compressor then there's a reason its failed.... before replacing it you need to do some checking...

 

If its burnt out and its the feed to the compressor then there's a reason its failed.... before replacing it you need to do some checking...

Totally agree, so a little more background: The machine was meant to be ran on 50hz(the ship makes 460v 220 per leg 60hz) so my co-workers hooked it up to a VFD. The VFD kept tripping because the it wasn't powerful enough to run everything. So they have it wired where the output pins of control board close a contactor which powers the compressor directly from the wall outlet. It seems a little questionable to me....hence this forum. Any help would be appreciated

 

That looks like a series resistor and capacitor they probably are a suppression pair, is there any voltage on the compressor terminals?

 

Totally agree, so a little more background: The machine was meant to be ran on 50hz(the ship makes 460v 220 per leg 60hz) so my co-workers hooked it up to a VFD. The VFD kept tripping because the it wasn't powerful enough to run everything. So they have it wired where the output pins of control board close a contactor which powers the compressor directly from the wall outlet. It seems a little questionable to me....hence this forum. Any help would be appreciated

Logically that should work - a contactor should be less of a load than the compressor. Surely such a machine would run well enough on 60Hz?

 

Logically that should work - a contactor should be less of a load than the compressor. Surely such a machine would run well enough on 60Hz?

I think the worry was if the entire machine was ran on 60hz the augers/turbines etc... would spin too fast. They might have tried that originally, I wasn't around when it was installed. Just trying to make it work again per order of the Chief Engineer.