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Whilst running a 3 phase motor control panel from a generator set I have intermittent tripping of the RCD unit on the generator, can you explain why this happens

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The RCD protection is sensing an inballance in the supply and return lines and tripping out.
This is usually due to leaks of current to ground, but in your case inductance of the motor may have an effect.

You could first try to eliminate hazards by doing an earth leakage test on the unit you are powering, as PAT test kits are available for hire.
If this tests out ok, then you may have to replace a leaky capacitor or two that should be reducing the back EMF.

Posted on Feb 08, 2010

Testimonial: "Thanks for your thoughts, I will check the leakage current and try to eliminate."

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What is causing RCD to trip repeatedly?


RCD is a safety device and is meant to trip if it sees a ground fault or phase to phase fault and protecting you from a shock sounds like you have a heater problem or a fan,if unit runs for hours with no trip then heater, if trip a few minuets then fan ,the only way to find it is to mega ohm each part with in the unit.

Jan 22, 2016 | Refrigerators

2 Answers

I have Hobart D300 mixer which operates at 220V, 3phase supply and whereas the facility has 208V, single phase supply. Is there any recommended phase converters available for this product. Thanks


Hi Bill
I may be wrong here......
But I've been around Electricity for a long time.
Have Never seen a device that does phase conversion.
A Building site or home will either have Three Phase or Single Phase Power Available
BUT...A portable (Hired) generator could be "three phase" and you could use any one of those phases individually or all three phases.

I have 3 Phase supply to my house!
But I use 230 volt Single Phase for appliances.
My Bore Pump uses a 3 Phase Motor,
(so with a voltmeter it would read about 440 vAC to the pump motor).
Some Further Info:
A GENERATOR is basically a motor used the opposite way. Rotate a motor and it Generates.
The Phases refer to the THREE Windings in the supplying generator in your suburb.
A Large Magnet passes each winding in sequence giving you the three ripples in the supply.
Our houses can choose to have 1 Phase or Three Phases from the street when you set up your electric supply.
So... to confirm, look at the wires on the supply poles to the premises. Usually three in our area (Oz)
Most people are not aware that a car Alternator is actually three phase. The Rotor is the magnet that rotates.
The only difference with an Alternator is that each "Phase" is connected to 2 Diodes (6 total) to convert the three phase to DC to charge the vehicle.
The Regulator controls the voltage to the Rotor, thereby controlling the output.
So.... An Alternator could in theory supply 3 Phase in a mobile generator. Custom Made. Constant speed would determine the frequency of 50Hz or 60Hz.
Not sure what country you are in

Hope this Helps or gives you food for thought!


Three phase electric power

Jul 08, 2015 | Hobart Food Mixers

2 Answers

Machine displaying general alarm the infuser slide was very tight freed up and reassembled now turning the machine on results in an arc at the motor brushes which blows the RCD breaker.


Hi Chris
Good Job freeing it all up etc. Your 90% there
Can you remove brushes & clean and stretch a millimetre more out of brush leads to stop arcing. Or perhaps the load is to great.
I did notice you said RCD.
RCD's usually only trip when an in-balance occurs between the hot phase wire & neutral wires.
Eg... what goes in via phase wire must come out on neutral wire. Even a small millivolt trickle to ground will trip an RCD. (20-30ma)
The Residual Current Device is for electric shock Safety.
It is not the main fuse or circuit breaker.
RCD's can be a real pain when there is a slight moisture leak.
For Example.
My fridge in my Winnebago would trip the RCD after it hadn't been used for awhile. The insulation around the 10A heating element was damp & tripping the RCD continually.
So how do I bypass the RCD to heat the element up and get rid of moisture. My method was to use a stand alone generator with no RCD to power the RV.
Worked great. Once the element surroundings were dry it ran fine on the home 240vAC.
So... If you really are tripping the RCD then the problem is AC "LEAKING" to Earth. Usually Moisture.....Try a hair dryer
If it is really blowing a Fuse or Circuit Breaker then the problem is too much current being drawn in circuit.
Hope this Helps
Trevor

Apr 07, 2015 | DeLonghi Prima Donna Avante ESAM6700...

1 Answer

Zanussi washing machine trips rcd on spin


Hi Ian.
I am assuming your RCD is fitted in your consumer unit (fuse-box)?
If so, then the chances of this being the cause is minimal. The RCD trips wen electricity is not balanced between live and neutral wires - which means some is leaking out to elsewhere - which it shouldn't because it is dangerous.
It would have helped if you had indicated how old your machine is, and how much use it has had but I am currently leaning towards the motor have several winding options that kick in (or not) depending on the spin speed. It would therefore be a motor fault, or something as simple as the brushes are disintegrating (which is often accompanied by hesitant and intermittent behaviour from the motor). These types of faults mean that some of the electricity may be leaking to the motor casing and then to earth.
I would recommend you call an engineer or if you have decent DIY skills, locate a replacement motor (ebay or the likes) and swap it out.
Good luck
David

Dec 15, 2013 | Zanussi Washing Machines

1 Answer

Essential 1600 spin


Hi Ian.
I am assuming your RCD is fitted in your consumer unit (fuse-box)?
If so, then the chances of this being the cause is minimal. The RCD trips wen electricity is not balanced between live and neutral wires - which means some is leaking out to elsewhere - which it shouldn't because it is dangerous.
It would have helped if you had indicated how old your machine is, and how much use it has had but I am currently leaning towards the motor have several winding options that kick in (or not) depending on the spin speed. It would therefore be a motor fault, or something as simple as the brushes are disintegrating (which is often accompanies by hesitant and intermittent behaviour from the motor). These types of faults mean that some of the electricity may be leaking to the motor casing and then to earth.
I would recommend you call an engineer or if you have decent DIY skills, locate a replacement motor (ebay or the likes) and swap it out.
Good luck
david

Dec 15, 2013 | Zanussi Washing Machines

1 Answer

I have i a kipor 11 kw genset. My home voltage is a 220v phase and neutral. When i start the genset, it trips the RCD, Solution ?


first start gen with no connections. when it trips then already fault is in gen wires when its ok, try with dril, hairdryer or whatever. when ok try to connect to your home installation, make sure power of electricity company is complete off.

Feb 04, 2010 | Briggs & Stratton Power Products 5,550...

1 Answer

Matching a generator to a motor


You need a e 3 phase generator to run a 3 phase pump first of all. Check to see that the generator is three phase. Most are not.

Jan 18, 2009 | Electrical Supplies

2 Answers

Suk92mfx5 main oven problem?


the fan element would have blown. it is not uncommon for an element to trip an rcd when it blows. you are on the right track, if you replace the element all your problems should go away

Feb 17, 2008 | Smeg SUK92MFX5 Dual Fuel (Electric and...

1 Answer

Hot point washing machine WMA 32


It's unusual for a household RCD to go out on excess current from an appliance - the fuse in the plug top and circuit fuse/MCB in the consumer unit should provide closer protection. This leaves you with an earth fault. Earth faults aren't usually related to motor load. Watch carefully what phase of the cycle the trip happens. Does it correlate with the start of water heating? A very frequent cause of low current earth faults is water ingress into the heating element. If you can trip the RCD reliably on every cycle, running the same cycle with the element disconnected would confirm whether or not this is the cause. A.

Feb 28, 2007 | Hotpoint WMA32 Front Load Washer

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