ABAC B312-100 compressor

[snotters64]

Much more basic than that. AC voltage is measured as the root mean square of voltage, as it alternates. It is the equivalent of a DC voltage wrt Ohm’s Law and resistive loads.

That means the peak voltage of a UK 230V supply will be ~360 volts - not allowing for any spikes above the normal range. Some capacitors supplied may only have an overload of a few %. 450V rating is a fair measure for longevity versus cost, but higher voltage rating is not unknown on high quality kit.

The above post, which quotes a lower voltage is flawed - because the UK AC voltage can be + 10%, of the nominal figure. Obviously there are a lot that don’t know the actual range we can be supplied with, from

Bypass the pressure switch you mean ?

Just tried this , looking like the motor is goosed

 

[hermetic]

does the motor make any noise at all, it is very unlikely to be totally goosed unless it is burnt out, does it have a centrifugal switch? is it open circuit when it should be closed for starting? have you checked the socket you are using with another appliance to make sure it is live? the motor has a start and a run winding, they will be marked A1 and A2 for the run, and Z1 and Z2 for the start winding, or maybe U1/2 and V1/2 whatever, you should be able to measure continuity between 1 and 2 on the same winding.

 

[snotters64]

does the motor make any noise at all, it is very unlikely to be totally goosed unless it is burnt out, does it have a centrifugal switch? is it open circuit when it should be closed for starting? have you checked the socket you are using with another appliance to make sure it is live? the motor has a start and a run winding, they will be marked A1 and A2 for the run, and Z1 and Z2 for the start winding, or maybe U1/2 and V1/2 whatever, you should be able to measure continuity between 1 and 2 on the same winding.

Motor doesn't make any sound when turned on ,have checked socket .

 

[snotters64]

Right , back at this test motor lark again . Where do I start . When I connect multimeter (ohms) black to cable 6 red to cable 5 meter reads .580 odd then goes to .003 , similar with the other cables .

 

[snotters64]

What I can gather from Google , any reading below .5 ohm means motor is ok

 

[snotters64]

This motor shows no signs of being burnt out , no smells just looks fine to me .

 

[carbon]

I haven’t checked a single phase motor recently but to me both windings should be of a similar colour if it’s ok. Checking with a pat tester will show if there is a fault compared to testing with a multimeter. I would also expect that .003 is to low as this is nearly a dead short

 

[Seadog]

I haven’t checked a single phase motor recently but to me both windings should be of a similar colour if it’s ok. Checking with a pat tester will show if there i

Not necessarily. If they've used wire from different sources the lacquer may be different. Smell is the big giveaway.

 

[snotters64]

Not necessarily. If they've used wire from different sources the lacquer may be different. Smell is the big giveaway.

Definitely no smell of a burnt motor .

 

[Seadog]

Which wires are connected to phase and neutral?

 

[snotters64]

Which wires are connected to phase and neutral?

This I don't know

 

[Seadog]

Has this ever run? From what I can see there is no centrifugal switch. So it's a capacitor start/capacitor run motor, which requires one capacitor. I'm assuming that the red wires are the start winding, the black/yellow the run (it may be the other way around).
It's possible that the two caps. Were parallel connected to make a 75μF capacitor.

 

[snotters64]

Has this ever run? From what I can see there is no centrifugal switch. So it's a capacitor start/capacitor run motor, which requires one capacitor. I'm assuming that the red wires are the start winding, the black/yellow the run (it may be the other way around).
It's possible that the two caps. Were parallel connected to make a 75μF capacitor.

It was used before and has definitely run before . The capacitors are start and run . And as far as I know ,the capacitors are in the same configuration from new .

 

[Seadog]

Is this something silly like a broken conductor in the mains lead?

The first two pictures show everything connected, but aren't clear enough to make out what's what. Do you have a better picture? Where do 1 and 6 connect to?

 

[snotters64]

Is this something silly like a broken conductor in the mains lead?

I've change the inlet cable double checked it ,checked continuity from the household plug to the pressure switch then from the pressure switch to the inlet of the motor where the capacitors are housed . From this pint in I don't really know what I'm doing or know which wire does what . Would it be worth trying to connect the motor bypassing the capacitors ,unfortunately I don't have a cap tester .

 

[Seadog]

What's the hp rating of the motor?

 

[snotters64]

What's the hp rating of the motor?

I'm not sure there's no tag on the motor ,think I read somewhere that it's a 3hp motor

 

[Seadog]

Is this something silly like a broken conductor in the mains lead?

The first two pictures show everything connected, but aren't clear enough to make out what's what. Do you have a better picture? Where do 1 and 6 connect to?

?

 

[snotters64]

This is how all the cables were connected

 

[Seadog]

Right , back at this test motor lark again . Where do I start . When I connect multimeter (ohms) black to cable 6 red to cable 5 meter reads .580 odd then goes to .003 , similar with the other cables .

Measure red to red, and black to yellow, nothing else connected.