Induction Heating Devices - Linn High Therm - #12

The Linn high frequency generators are: HTG 1500/0.5, HTG 3000/0.4. HTG 6000/0.3, HTG 12000/0.2

I hey are free running pustvpuli generators utilizing Po­wer FET teclmojogy. Staples output control 10 lo too %. RFI suppression as per VDI and 1-1 /.

I he use of transistors rather than vacuum tubes for the oscillators oilers some essential advantages. Iransi-stcis do not require fi'amonl voltages. The dimensions of component parts are notably smaJinr lhan would be the case wtth vacuum tubes. I he operating tosses of (he transistors nre decidedly smaller, reducing cooling requirements, Tine overall efficiency of the facility is approx. 20 % tikjlior than comparable vacuum tube models.

Transistor drive voltages are lower, this reduces the equipment size, as well as the weight of the power

Supplies.

II even smaller dwfc;e dimensions nie needed, separati­on of power supply and RF/HF section are necessary.

Frequently the lelroiiitmy at inductive heating devices becomes impractical owing to cxlornal dimensions. Use of semiconductor type devices makes retrotitling .it :k- in most cases, even il space availability is limi­ted.

Vacuum tube type generators are high internal resistan co devices mandating high output voltages, in the kilo-volt range.

These high voltages make necessary extra guarding to prevent accidental contact with lethal vollaqes. Also an increased demand exists lor RFI si itekling.

Transistor lyjjh generators, having low internal resistan­ce eliminate the possibility of accidentally contacting danyoious voltugos. They can bo salely touched.

Iwo types are available:

' Compact unit with integrated I IF/I IF section

* Control unfl with separate RF/HT section max. sepa­ration distance 10 meters or 32.b feet. Explosion protection model in preparation

Salely features:

' Rapid overtoad disconnecting

■ Control voltage monitoring

■ .Drain" voltage nxx liioring

" Cooling waloi How fixjntloring ' Operating tentfieraturemonitonng

LED indicators (or:

* High frequency ' Oveiload

' Insufficient cooling water flow ' Over temperature

Options for the FUG series

' Heat exchanger lor better cooling ot the RF/HF part {at lugh surrounding temperatures or continuous operation}

' Potential free oullets of the conlrol functions ' Pedal switch

' Conlrol uml HTG-REG (also available with RS 232,

see pict. 27) ' Optical pyrometer

* Adaption transformer for small inductors For bw Ohm inductors an adapter piece {transtor-moi) must bo used between mduclix and the RF/H1 generator. Noto Hie characteristic curves of the trans former In pel. 28.

IIIG-RTG

ith) IF HMloP

<s>j IUj

Pht. 23, Characteristic curve of transformer.

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