DATA SHEET ALLUMINIUM HOUSED POWER WIREWOUND RESISTORS STYLE SRF 100 & FEATURES N STYLE A STYLE B

Transcription

1 N foglio 1 di 2 Revision Emission DT ALLUMINIUM HOUSED POWER WIREWOUND RESISTORS STYLE SRF 100 & 150 1,5mm 2 M 22 29,5 15,5 250 L 4,2 16 STYLE A 29,5 15,5 STYLE M L Power rating W SRF SRF STYLE B 1.FEATURES The SRF style resistors are a range of good quality products, designed to achieve a high level of protection (IP55) and an elevated dielectric strength. The special construction technology makes use only of inorganic materials so as to permit confidence of use beyond 400 C. These resistors, in spite of the reduced dimensions, ensure a good endurance to adiabatic impulses added to an excellent possibility of thermal dissipation. These characteristics and the mounting facility make the SRF style essential where high reliability is required even in heavy duty as: - brake resistors - inverter - snubber - capacity discharge Moreover the power rating of the resistors may be increased rather a lot of times using a suitable heat sink.

2 N foglio 1 di 2 Revision Emission DT ELECTRICAL SPECIFICATIONS Characteristics SRF100 SRF150 Power rating (Pr) 100 W 150 W Temperature Pr 370 C 370 C Max. power on 1 /W heat sink 150 W 200 W Max. power on water cooled heat sink 200 W 300 W Absorbed 250 C T J J Absorbed energy in 5 overload J J Resistance range 0, , Resistance tolerance ±5% ±5% Parasitic capacity (from 1 to 100 khz) 100 pf 150 pf Max. working voltage V V Insulation 1000 VDC M M Dielectric 50 Hz for Vrms Vrms Thermal time constant Max. adiabatic impulse in relation to the resistance value Energy J SRF SRF , Resistance value

3 N foglio 1 di 1 Revision Emission DT Resistori di frenatura in custodia di Brake resistors Style alluminio Mod. SRF 120 & SRF 180 SRF 120 & SRF L 20 = = 25 7,2x9 = 160 = Modello Style Dimensions L peso weight SRF g SRF g 2. ELECTRICAL SPECIFICATIONS Caratteristiche SRF 120 SRF 180 Characteristics Potenza nom.con dissipatore ( Pr) 200 W 280 W Power rating with heat sink(pr) Aumento di Pr 330 C 330 C Temperature Pr Resistenza termica del dissipatore 0,5 /W 0,5 /W Thermal resistance of heat sink Temperatura del dissipatore 80 C 100 C Temperature of heat sink Potenza max.senza dissipatore 120 W 180 W Max. power without heat sink Energia assorbita a 250 C T J J Absorbed 250 C T Energia assorbita in 5 di sovraccarico J J Absorbed energy in 5 overload Gamma valori Resistance range Tolleranza ±5% ±5% Resistance tolerance Capacità parassita 100 pf 140 pf Parasitic 1000 Hz Massima tensione di impiego 1000 V 1000 V Max. working voltage Rsistenza di 1000Vcc 1000 M Isolation 1000 VDC Rigidità 50 Hz per V Dielectric 50 Hz for 1 3.Massimo impulso adiabatico in funzione del valore resistivo (t 0,1 sec) Max. adiabatic impulse related to resistance value (t 0,1 sec) 4500 J J - SRF180 SRF Resistance value

4 N page 1 of 2 Revision 1 15/10/01 Emission DT ALLUMINIUM HOUSED POWER WIREWOUND RESISTORS STYLE SRF 250 & L 30 SIR SRF ± 5% 35 1.FEATURES STYLE L Power rating W SRF SRF The SRF style resistors are products of good quality designed to achieve a high level of protection (IP55) and an elevated dielectric strength. The special construction technology makes use only of inorganic materials so as to permit confidence of use beyond 400 C and to ensure a good endurance to adiabatic impulses. These characteristics and the mounting facility make the SRF style essential where high reliability is required even in heavy duties as: - brake resistors - inverter - snubber - capacity discharge Moreover the power rating of resistors may be increased using a suitable heat sink. 2. MOUNTING SYSTEMS On the resistor s body (as per drawing) three special grooves are placed to contain, without the possibility to turn, M4 nuts suitable to fasten the resistor in several ways. However the resistor can be supplied with the following brackets Mounting Brackets 50

5 N page 1 of 2 Revision 1 15/10/01 Emission DT ELECTRICAL SPECIFICATIONS Characteristics SRF250 SRF350 Power rating (Pr) 250 W 350 W Temperature Pr 380 C 380 C Max. power on 0,7 /W heat sink 300 W 400 W Max. power on water cooled heat sink 400 W 500 W Absorbed 250 C T J J Absorbed energy in 5 overload J J Resistance range 0, , Resistance tolerance ±5% ±5% Parasitic capacity from 1 to 100 khz) Max. working voltage V V Insulation 1000 VDC M M Dielectric 50 Hz for Vrms Vrms Thermal time constant Max. adiabatic impulse in relation to the resistance value Energy J SRF SRF , Resistance value

6 N foglio 1 di 2 FOGLIO DATI Revision 0 10/05/99 Emission DT RESISTORE DI POTENZA IN CUSTODIA DI ALLUMINIO MODELLO SRF 17x 300 L ALLUMINIUM HOUSED POWER WIREWOUND RESISTORS STYLE SRF 17x 30 M 35 I Dimension SRF 170 SRF 171 SRF 172 SRF 173 SRF 174 SRF175 M L I Peso 160 g 190 g 290 g 380 g 500 g 620 g 1.CARATTERISTICHE GENERALI Il resistore modello SRF 17x è un prodotto di buona qualità studiato per ottenere un buon livello di protezione (IP55) unitamente a una rigidità dielettrica elevata. La particolare tecnologia di costruzione impiega esclusivamente materiali inorganici, cosa questa che permette l impiego di questo prodotto sino a 400 C e nel contempo assicura un buon comportamento agli impulsi adiabatici. Malgrado le dimensioni ridotte la dissipazione termica è eccellente. Con un dissipatore adatto la potenza dissipabile può essere aumentata notevolmente 1.FEATURES The SRF 17x style resistors is a good quality product designed to achieve a high level of protection (IP55) and an elevated dielectric strength. The special construction technology makes use only of inorganic materials so as to permit confidence of use beyond 400 C and to ensure a good endurance to adiabatic impulses added to an excellent capacity of thermal dissipation, in spite of the reduced dimensions of these resistors. Moreover the power rating of resistors may be increased rather a lot of times using a suitable heat sink.

7 N foglio 2 di 2 FOGLIO DATI Revision 0 10/05/99 Emission DT CARATTERISTICHE ELETTRICHE 2. ELECTRICAL SPECIFICATIONS Characteristics SRF 170 SRF 171 SRF 172 SRF 173 SRF 174 SRF175 Potenza max su dissipatore da 0,2 /W 165 W 210 W 305 W 400 W 500 W 600 W Max. power on 0,5 /W heat sink Pot. max su dissipatore raff.ad acqua Max. power on water cooled heat sink 180 W 230 W 340 W 440 W 540 W 650 W Capacità C T Thermal 250 C T 115 J/ K 136 J/ K 216 J/ K 295 J/ K 385 J/ K 480 J/ K Energia assorbibile in 5 di sovraccarico Absorbed energy in 5 overload 7500 J J J J J J Gamma dei valori di resistenza 1, , , , , Resistance range Tolleranza ±5% Resistance tolerance Capacità prassita pf 60 pf 65 pf 100 pf 140 pf 180 pf 230 pf Parasitic capacity Massima tensione di impiego Max. working voltage V 1500 V 1800 V 2500 V 2800 V 3000 V Resistenza di 1000 Vcc Insulation 1000 VDC 1000 M Rigidità 50 Hz per Veff Dielectric 50 Hz for 1 Vrms Costante di tempo termica Thermal time constant Massima temperatura superficiale Max. surface temperature 420 C 3. ESECUZIONI SPECIALI SPECIAL FEATURES Su richiesta sono disponibili le seguenti The following special features are esecuzioni speciali: available : Esecuzione con termostato Resistor with thermostat (Clixon (SRF 17x T) type) with the denomination Esecuzione con cavi di lunghezza differente dallo standar (lunghezza massima m 1) ( SRF 17x T) Length of cables different than in the standard model (max. length m 1)

8 N page 1 of 2 Revision 0 14/04/97 Emission DT 14/04/97 Resistori di frenatura in custodia di alluminio Mod. SRF 650, SRF 950 SRF 1350 Brake resistors aluminium housed Style SRF 650, SRF 950, SRF ,5mm 2 I 5, ELECTRICAL SPECIFICATIONS Caratteristiche SRF 650 L Modello Style Dimensioni Dimensions I L peso weight SRF g SRF g SRF g SRF 950 SRF 1350 Characteristics Potenza nom.con dissipatore ( Pr) 650 W 950 W 1350 W Power rating with heat sink(pr) Aumento di Pr 390 C Temperature Pr Resistenza termica del dissipatore 0,3 /W 0,2 /W 0,1 /W Thermal resistence of heat sink Potenza max.senza dissipatore 390 W 560 W 800 W Max. power without heat sink Energia assorbita a 250 C T J J J Absorbed 250 C T Energia assorbita in 5 di sovraccarico J J J Absorbed energy in 5 overload Gamma valori Resistance range Tolleranza ±5% ±5% ±5% Resistance tolerance Capacità parassita 120 pf 190 pf 250 pf Parasitic 1000 Hz Induttanza µh µh µh Inductance Massima tensione di impiego 1000 V 1000 V 1000 V Max. working voltage Rsistenza di 1000Vcc 1000 M Isolation 1000 VDC Rigidità 50 Hz per V Dielectric 50 Hz for 1 3.Massimo impulso adiabatico in funzione del valore resistivo (t 0,1 sec) Max. adiabatic impulse in relation of resistance value (t 0,1 sec) 9000 J J - SRF1350 SRF950 SRF Resistance value

9 N Page 1 of 1 NICKEL PLATED STEEL HOUSED POWER WIREWOUND RESISTORS STYLE SRF ,5mm ,8 Revision 2 23/10/00 Emission DT Thermal protection (on request) 1.FEATURES These types of resistors are made with two resistance element of the model SRF 1300 and are an implementation of the series SRF They are a range of good quality products with a case in nickel plated steel, designed to achieve a good level of protection (IP33) and a good dielectric strength. 2. ELECTRICAL SPECIFICATIONS Characteristics Power rating (Pr) (with 0,5 C /W heat sink) Characteristics 2000 W Temperature Pr 450 C Max. power without heat sink 800 W Absorbed energy in 5 overload J Resistance tolerance ±5% Max. working voltage 1200 V Isolation 1000 VDC 500 M Dielectric strength for 1 min Vrms 3. Max. adiabatic impulse related to the resistance value (Time< 0,1 sec.) (for each resistance element) Energie J J J J J J J J J 1000 J Resistance value 13

10 N foglio 2 di 5 Revision Emission DT ELECTRICAL SPECIFICATIONS CHARACTERISTICS RFH 350 RFH 500 RFH 750 RFH 1100 Power rating (Pn) W Max.Power without heat sink W Surface temperature Pn 375 C 385 C 385 C 395 C Max.Power rating heat sink mounted W Power rat.water heat sink mounted W Absorbed 250 C T J Absorbed energy in 5 J Resistance range 0,5 10 k 0,5 18 k 0,5 27 k 0,5 27 k Tolerance for Resistance values ±5% Hz µh Parasitic capacity (from 1 to 100 khz) pf Limiting element voltage V Insulation 1000 Vcc M Dielectric 50 Hz per Vrms Thermal time constant 18 (see graph) 3. APPLICATION NOTES. 10 cm 3.1. Power rating. The dissipation power of a resistor depends also from the mounting position. If the resistor is mounted onto a surface, the latter takes part positively (if it is large and conductive) or negatively (if it is small and insulating) to the thermal dissipation. Data of power rating are referred to a resistor mounted vertically, with terminals in the lower side and away from the nearest surface at least 10 cm, in order to avoid thermal influence from the wall Surface temperature Pn. During the load application, the surface temperature is not homogeneous, and it is higher on the flat surface of the resistor (surface that in the practical application shall be fixed to a heat sink or to a metallic surface to help the thermal dissipation) Max.power rating of a resistor mounted onto a heat sink. Standard heat sink is a common heat sink (as shown) used for the cooling of semiconductors, with two grooves for components mounting. The distance between the axes of these two grooves is 80 mm. In this case both heat sink and resistor will be mounted upright. The length of the heat sink shall be at least 40 mm longer than the resistor s body (20 mm for each side). 3.4 Power rating of a resistor mounted on a water-cooled heat sink. If the heat sink is water-cooled, power dissipation increases considerably, and the limiting power rating is due to temperature of the resistor body.

11 N foglio 3 di 5 Revision Emission DT In the case illustrated in the specifications board, the temperature of the heat sink is 40 C and the resistor s surface reaches 300 C. In this case too, the length of the heat sink shall be at least 20 mm longer than the resistor s body. 3.5 Absorbed 250 C T. It represents the quantity of energy stored into the resistor when it has reached 250 C of temperature rise. The above indication is an index of the thermal capacity of the resistor. 3.6 Absorbed energy in 5. It gives an index of behaviour of the resistor to short overloads. 3.7 Absorbed energy in time 0,2. During a short impulse (from 0 to 2 sec.), the resistor may stand only the energy that the thermal capacity of the resistance wire is able to absorb. In fact the phenomenon is too short to let significant heat conduction from wire to filling material. The energy absorbed from the resistor in this case results from this simple equation. Q J = Cs P T where: - Q J is the quantity of energy expressed in Joule, - Cs is the specific heat of the employed resistance alloy expressed in J g -1 K -1, - P is the weight of the wire in grams and - T is the rise of temperature, expressed in K, reached by the wire during the impulse. As type and quantity of wire are characteristics of every resistance value and resistor model, the acceptable temperature limit of wire is relevant. This limit (@ 25 C) is: C for the standard operations (steady state load); C for not repeatable overload. The following graphs show these two conditions for each resistance value and resistor type Graph 1: Absorbed energy for wire temperature of 500 C.(Impulse time 0,2 ) 15 kj 14 kj 13 kj RFH kj 11 kj 10 kj 9kJ 8 kj 7 kj 6 kj 5 kj RFH 750 RFH kj 3 kj 2 kj 2 kj RFH 350 0,

12 N foglio 4 di 5 Revision Emission DT Graph 1: Absorbed energy for wire temperature of 800 C.(Impulse time 0,2 ) 24 kj 22,5 kj 21 kj RFH ,5 kj 18 kj 16,5 kj 15kJ 13,5 kj RFH 12 kj 10,5 kj 9 kj RFH 7,5 kj 6 kj 4 kj 2 kj RFH ** 0, **RFH1100**RFH 750**RFH 750**RFH 350** Both the graphs are irregular owing to the necessity to adapt the commercial dimension of wire to the resistance range, however they are enough to show the trend of this characteristic. Should the energy value of an impulse be too close to the limits given from these graphs, it is suitable to consult the factory for further information concerning the precise value of absorbed energy for the used resistor. 3.8 Resistance range. The resistance range fulfils almost all the use of power resistors, but in cases of special requirements, lower or higher resistance values are available on request as well as closer tolerances. 3.9 Inductance. The inductance changes with the resistance value and is not very influenced from frequency. On request the RFH resistors are available with non inductive windings (Airton-Perry s system) and are identified by adding the letter N after the RFH identification (e.g.rfhn500). he inductance of the RFHN resistors is less then 1 µh Parasitic capacity. Parasitic capacity does not depend on the resistance value, but it changes with frequency. The supplied value are just referred to 1 khz (the higher) and 100 khz.. During normal load conditions the effects of parasitic capacity are negligible. However in the presence of transients of high voltage (time < 10 µsec), the housing may be source of interference for the most sensible electronic circuits. For a correct grounding of the housing, RFH resistors are available, on request, with a threaded hole M Limiting element voltage. This is the maximum voltage, which should not be exceeded during the application conditions. The rated values are rather elevated, but special designs with higher limiting element voltage are available for particular requirements.

13 N foglio 5 di 5 Revision Emission DT The limiting element voltage of non inductive resistors is lower than the standard resistors (Please contact us for advice) Insulation resistance and dielectric strength. After a long load time, the insulation resistance of RFH resistors keeps elevated as the employed insulating material does not get damaged despite the high thermal conditions Thermal time constant. The dimension of the resistor models is proportional to power rating and weight, therefore their behaviour during the rise of temperature, when the rated power is applied, is analogous. Of course the application of a heat sinks or the mounting of the resistor on a surface, will modify the thermal time constant which is peculiar for each application. Graph 3: Thermal time constant Kt. T C Rated Power Kt / 3 Rated Pover ½ Rated Power min 4 FURTHER INFORMATION In case, if it is necessary to deal a more exhaustive analysis of thermal behaviour of resistor for a design development, it is suitable to require Thermal model of RFH resistors

14 N page 1 of 2 Revision 1 05/07/99 Emission DT 03/06/99 ALUMINIUM HOUSED POWER WIREWOUND RESISTOR STYLE RFH 1500 & RFH 1800 & ,5x11 2,5mm 2 I A P L STYLE A B L I P POWER RFH W RFH W RFH W Standard cables length mm 300 B 1.FEATURES These types of resistors are an implementation of the serie RFH They are a range of good quality products with a case in aluminium, designed to achieve a good level of protection (IP54) and a good dielectric strength. The special construction technology makes use only of inorganic materials so as to permit confidence of use beyond 350 C and to ensure a good endurance to adiabatic impulses and to thermal dissipation. These characteristics and the mounting facility make this SRF style an appropriate choice where high reliability is required even in heavy duties as: - brake resistors - inverter - snubber -very large capacity discharge This type of resistor doesn t need the use of a heat sink.

15 N page 2 of 2 Revision 1 05/07/99 Emission DT 03/06/99 2. ELECTRICAL SPECIFICATIONS Characteristics RFH 1500 RFH 1800 RFH 2200 Power rating (Pr) 1500 W 1800 W 2200 W Temperature Pr 410 C 410 C 410 C Suggested continuous power max W 1300 W 2000 W Absorbed 250 C T J J 1M J Absorbed energy in 5 overload J J J Resistance range 6, , Resistance tolerance ±5% ±5% ±5% Parasitic capacity from 10Hz to 100 khz 250 pf 250 pf 250 pf Max. working voltage 1200 V 1200 V 1500 V Isolation 1000 VDC 250 M 250 M 250 M Dielectric 50 Hz for Vrms Vrms Vrms Thermal time constant Weight 2750 g 3000 g 7000 g Vertical mounting suggested 3. Max. adiabatic impulse in relation to the resistance value (Time< 0,1 sec.) Energie RFH J- RFH1500 & J J J J J J J J 3000 J Resistance Value

16 N Page 1 of 2 Revision 4 29/05/00 Emission DT 03/06/99 ALUMINIUM HOUSED POWER WIREWOUND RESISTOR STYLE RFH 1000 & RFH 1400 & RFH 1900 B 6, A 73 L Resistor Style Dimension Dimension Dimension Weight L A B RFH Kg 2,5 RFH Kg 3,2 RFH Kg 4 Standard length of cables 300 mm - Cross-section 4 mm 2 1.FEATURES These types of resistors are an implementation of the series RFH They are a range of good quality products with a case in aluminium, designed to achieve a good level of protection (IP54) and a good dielectric strength. The special construction technology makes use only of inorganic materials so as to permit confidence of use beyond 400 C and to ensure a good endurance to adiabatic impulses and to thermal dissipation. These characteristics and the mounting facility make this SRF style an appropriate choice where high reliability is required even in heavy duties as: - Brake resistors - inverter - snubber -very large capacity discharge This type of resistor doesn t need the use of a heat sink.

17 N Page 2 of 2 Revision 4 29/05/00 Emission DT 03/06/99 2. ELECTRICAL SPECIFICATIONS Characteristics RFH 1000 RFH 1400 RFH 1900 Power rating (Pr) 1000W 1400W 1900 W Temperature Pr 380 C 380 C 410 C Suggested continuous power max. 750 W W 1300 W Absorbed 250 C T J J J Absorbed energy in 5 overload J Resistance range 6, , ,8 300 Resistance tolerance ±5% ±5% ±5% Parasitic capacity from 10Hz to 100 khz 200 pf 220 pf 250 pf Max. working voltage 1200 V 1200 V 1200 V Isolation 1000 VDC 250 M 250 M 250 M Dielectric 50 Hz for Vrms Vrms Vrms Thermal time constant Vertical mounting suggested 3. Max. adiabatic impulse in relation to the resistance value (Time< 0,1 sec.) Energie J J J J - RFH 1400 RFH 1000 RFH J J J J 3000 J resistance value