Compressor fuse blowing

[Kevin Walker]

Morning,

I have a sealey 1153b compressor which keeps blowing its fuse. Originally i thought it was the start capacitor so i replaced it first

I then removed the belt and the motor runs perfect, as soon as the belt goes back on it trys to turn but then trips again. I checked the belt tension and pulleys and it doesnt appear to be too tight.

Im stumped and any suggestions would be greatly appreciated


Thanks

 

[The_Yellow_Ardvark]

If the motor runs of load, eg no compressor attached, the motor seams ok.

The load will be from the compressor, have you checked that out?

 

[The_Yellow_Ardvark]

Oh yes, welcome to the forum.

 

[premmington]

Possible causes!

1. Pump not unloading pressure - no soft start - this will be a hole out of the pressure switch.

2. Pump siezed - try rotating by hand.

3. Motor pooped - unlikely if it runs OK - albeit with no load.

 

[Kevin Walker]

Thanks for the replies and the welcome.

When i spin the pulley on the compressor itself it appears to turn no problem. Obviously not loose but feels just right with enough compression.

Apologies for what may be a dumb question but when i turn the compressor pulley i hear a hiss from the pressure switch, is that normal? I did open the drain valve and output tap from the tank before starting when the belt was on and it still tripped.

Thanks

 

[Kevin Walker]

Thanks premmington.

How would i know if it wasnt unloading pressure? I get a hiss when i turn the compressor pulley by hand however did try to run the compressor with the drain valve and tap open.

Thanks

 

[Ashley Burton]

So does the motor run with the belt off?

 

[Kevin Walker]

So does the motor run with the belt off?

Motor runs perfect with the belt off. Compressor turns by hand quite easily too

 

[8ob]

Could be a dodgy trip, try it on a different power circuit,

Bob

 

[Kevin Walker]

Hi Bob,

I tried it in a different circuit just now and same tried to start again and then tripped

Thanks

 

[The_Yellow_Ardvark]

Hi Bob,

I tried it in a different circuit just now and same tried to start again and then tripped

Thanks

So you can say the supply is good. I guess that it ran great before, or is it new to you?
What breaker size are you running it from?
Can you throw up a picture of the motor plate, we have some good sparkies on here.

If the supply to the motor is good and the motor is good. Then it must be down stream of it.

Does the motor start and then blow?
Or is it a switch on, bang and no power?

Either way you have to start looking past the motor, switches on the compressor, the compressor.
A Multi meter will be your friend.

 

[julianf]

If you unload all the air from the tank before starting, does it start up fine?

Then, once started, does it turn on and off on its own fine, when still warm?

If "yes" to the above, it's fairly standard. Make sure it's not on an extension lead, and consider running off a 16a plug.

 

[8ob]

Here is the garb/ spec, does say minimum 13amp supply. Ordinary plug top may be marginal.

Model No. SAC1153B
Compressor 150L Belt Drive 3hp with Cast Cylinders
Promotion Price
£649.95
exc VAT

£779.94
inc VAT

List Price
£874.95 exc VAT
£1049.94 inc VAT
1x FREE Item included
1x

Compressor Oil 1L - Pack of 12

Model No. CPO/1

This product is on Agricultural 2019/20


Safety Data

Instructions

Parts Diagram
We only provide documents for our current models on our website.
If you require a parts diagram for a previous version please contact us on 01284 757505 or e-mail technical@sealey.co.uk.

• Description
• Specification
• Spare Parts

Air Displacement cfm(L/min):

13.4(380)

Maximum Free Air Delivery cfm(L/min):

8.8(249)

Maximum Pressure:

145psi(10bar)

Minimum Rated Supply:

13A

Motor Output:

3hp

Nett Weight:

78kg

Outlet:

1/2"BSP Female Tap

Phase:

1ph

Receiver Capacity:

150L

Size (W x D x H):

1320 x 400 x 820mm

Speed:

1630rpm

Supply:

230V

 

[slimjim]

My compressor did this a few years ago, I replaced the start capacitor and it still did it, so I bought a slightly higher rated one and it’s worked fine ever since,

Don’t know if that’s your problem, but it worked for me

 

[GrahamGKD]

Is it the fuse in the 13A plug which is blowing or the MCB at the consumer unit? Is the problem a cold weather thing? I used to have trouble starting my compressor in the winter (when the oil is cold and more viscous). I now have a 16A circuit with a dedicated C curve MCB and that works fine.

 

[bletchmonster]

As suggested above, faulty capacitor is quite likely. Also check all the connections (Inc capacitor) in motor Junction box. Constant vibration and thermal loading tends to loosen the joints.

 

[brightspark]

has it ever run ok on a 13 amp fuse or is it on a mcb

 

[R-D-R]

Have you tried disconnecting the thin air pipe from the unloader valve? if the unloader valve or the pressure switch is faulty there could be high pressure stuck between the pump and the tank making it difficult to get upto speed.

 

[brightspark]

Have you tried disconnecting the thin air pipe from the unloader valve? if the unloader valve or the pressure switch is faulty there could be high pressure stuck between the pump and the tank making it difficult to get upto speed.

that wont matter if its blowing fuses starting with an empty tank only under load it will

 

[R-D-R]

Was thinking if the unloader valve is faulty it may be jammed shut causing the motor to trip even if the tank pressure is low.

guess easy way to check is disconnect compressor from valve and see if it fires up.