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Monday, July 14, 2008

GLD- INDUCTION FURNACE

GROUND LEAK DETECTOR

1) GLD is directing the first earth for the system .G stands for electrical component grounding & LD stands for Leak detector
2) It is the voltage sensing circuit it senses voltage across the DC supply. In case of voltage exceeding 200V,GLD will turnoff the power unit automatically.

GLD due to panel problem
After GLD arrives press reset button and release, when the GLD immediately glows GLD shows After GLD arrives press both reset and probe disconnect button then remove the finger from reset button immediately GLD shows the problem in panel.

GLD due to furnace side
· After GLD arrives press probe disconnect button ma value goes to 0 means GLD due to crucible
· Every GLD failure, we need to check GLD & GFL function.

Test button
This button puts an artificial ground on the ground detector to ensure the functioning properly

GLD Voltage
GLD is a 45v DC unit with continuously changing polarity. It is supplied to the power circuit through choke.
GLD OPTO
It converts AC to DC with every 20seconds polarity change
GLD input power detail
Input -415 / 110V Pin no.100 common & Pin no. 111 = 26V DC
Wire no. 144 for GLD connection in control board +15v Healthy & 0v Faulty
GLD Volt trip
This problem is related to converter section or incoming normal 60-volt supply

GLD Current trip
This indication shows there is a problem in crucible side (metal penetration or scrap touching into coil or water leakage from coil and hose)

Probe disconnect
When pressing this button, it disconnects the crucible side GLD.It is helpful to find whether the GLD is due to Furnace or panel

GLD Indication other than furnace
ü Higher water conductivity increases the electrolysis process of Cu tubes and components, etching away gradually. This may also result in false tripping of GLD
ü Good working furnace GLD should be 5 to 6ma only.
ü Increasing of leakage current cause damaging GLD circuit resulting frequent fault GLD trip. (Leakage current increased due to high water conductivity)

GLD Wire & connection
· Wire should be Stainless steel (304 or 316)
· Thickness of the wire should be 3 to 5mm
· Antena wire (3wire &6 terminal) properly welded and in contact with former
· Antena rod and panel GLD wire connection should be tightened with bolt.
· During normal operation GLD sensitivity should be 100% (to give safety to operator and coil) So as to trip at 60ma.leakage current.
· Due to moisture in new lining, GLD value shows high at that time we need to switch off the CT temparely till the GLD value reduces. (Close monitoring required when CT is not running)

19 comments:

Milliscent Morgan said...

I found it so nice so it could be better if you'll keep on posting about Induction furnace SCR Canada./

Manthan said...

What is scr voltage fault in indctothem how can solve it

Unknown said...

Is GLD shows the Leakage Earth current in furnace coil?What input supply to GLD AC R DC?

Unknown said...

We are install furnace since last 5 years. Good working. Power factor is good. With normal CAPACITOR. But now same furnace generat harmonic. & CAPACITOR is not working. Not a any change in furnace or electric system. What is problem in furnace Pl mention.

Unknown said...

Thank you for sharing such a great info on furnace.
furnace manufacturer

Victoria Martinez said...

These are so helping tips given to keep a furnace maintain over the time. As the furnace is offering you heat you should have checked it timely for any faults. Heating and Cooling Markham

Vijayakumar said...

Thanks a lot given such a valuable tips

Gowthaman sonai said...

It is very useful to me
Very thanking you

Gowthaman sonai said...

Dear sir,
what is the meaning for CT ( GLD )
kindly replay

Unknown said...

Gld is very high how to control gld for infection furnace

Unknown said...

Sir infection furnace gld 196 after gld wire disconnected. How to control gld and how to cheack gld circuit

Unknown said...

why High DC voltage trip appeared in induction furnace?
what i's the solution of this fault of induction furnace

Unknown said...

Sir what we do when gld current trip occurs. Kindly give reply on this situation

Unknown said...

Sir .jee
We r check all given all ebove reason but solution not found .may any another reason???

Trutech Products said...

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Unknown said...

Sir
In dual track furnace newly coil serviced after fixed then after 17 melts gld current trip observed and furnace fully induction observed sir.what is the reason for these problems and how to i solve the problems sir

Trutech Products said...

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Unknown said...

Induction furnace me invc kya hai
Ye kaise theek kiya jata hai

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