POWER SUPPLY UNIT FOR 2 KW MAGNETRON TECHNICAL NOTE

Transcription

1 POWER SUPPLY UNIT FOR 2 KW MAGNETRON TECHNICAL NOTE (Issue October 2004)

2 CE Declaration of Conformity Dichiarazione di Conformità CE Manufacturer s Name: Nome del Costruttore: Manufacturer s Address: Indirizzo del Costruttore: ALTER s.r.l Via Curie, Reggio Emilia - Italy Declare that the microwave generator: Dichiara che il Prodotto: product name: nome del prodotto model: modello Complies with the following norms: Soddisfa le seguenti norme: FX740 FX740 FX740T FX740T EN : A2: 1996 (EN 61010: A2: 1995) EN55011: 1991 The products listed above comply with the requirements of the Low Voltage Directive 73/23/EEC. I Prodotti sopraindicati sono conformi con la Direttiva di Bassa Tensione 73/23/EEC Reggio Emilia, Ottobre Marco Garuti Presidente C.d.A. Rev. Note di revisione Data File 0 Prima emissione Ottobre 2004 FX740T_r0eng File: FX740T_r0eng - Ottobre Manuale per: FX 740 T page 1 di 7

3 General Description FX740T is a stabilised ferro-resonant power supply unit, with a fixed output, for a 2kW powered magnetron. The power supply unit must be connected to the 2 x 400V/ 50Hz electric network without neutral, and is provided in open frame version to be assembled in the electrical panel. General Information The FX 740 T power supply unit is in compliance with the EN (=CEI 66-5) European Standard approved by Cenelec on 9/3/1993. As provided by this standard, the equipment must be installed and used exclusively by qualified personnel instructed on the precautions and operating mode. The generator, if correctly installed, is in compliance with the expected radio noise limits for Group 2, Class A equipment provided by the EN regulation. CAUTION! FX 740 T is powered through the mains: read this manual carefully before installing the equipment. Make sure that the electric connection and the utilisation are correct. Failure to comply with the instructions implies serious risks for the personnel in charge of the equipment utilisation, as well as the possibility to cause equipment breakdowns. Equipment rating Power supply (rated): 400Vac, 50Hz Minimum input voltage: 360V Maximum input voltage: 440V Input current (average value): 7 400V Rating: 2900 VA Efficiency: 95% Magnetron power: 2 kw Outgoing stability: +/-3% Outgoing anodic current: 750 ma Magnetron: 2M130 - NL10250 Environmental conditions Operating mode: only inside the panel Altitude: tested up to 2,000 m above sea level Temperature: from 5 C to 40 C Relative humidity: 80% up to 31 C, linear decrease by 50% at 40 C Level of pollution: 2, in compliance with IEC664 Fuse specifications FX 740 T has two (F1 and F2) fuses assembled on the control card and one (F3) fuse assembled on the autotransformer. F1, F2 fuse data: - Size, type: 10 x 38 mm, ceramic - Operating speed: normal - Rated current: 16 A - Rated voltage: 500 V F3 fuse data: - Size, type: 5 x 20 mm - Operating speed: delayed (T) - Rated current: 1 A - Rated voltage: 250 V Fuse replacement Replace the fuses as follows: - turn the voltage of the power supply unit off; - remove the cover (if any); - remove the cap of the fuses; - replace the fuse with a new one with the same electric characteristics; - check the fuse holder and in case of oxidation or burns, replace it; - reassemble the cap of the fuses; - reassemble the power supply unit and turn the voltage on. Refer to Fuse specifications for the value of the fuses. page 2 di 7 File: FX740T_r0eng - Ottobre Manuale per: FX 740 T

4 Component Layout Connection of the H.V. cable to the magnetron Input 400 V Hearth screw Component List Pos. Q.tà Descrizione Codice Note 1 2 H.V. Capacitor CR132A2K5 2 1 H.V. Transformer 42AN3000/ Solid state Relay RERM1C60D Fuseholder for fuse 10x38 mm FUWBBCH2/38 2 Fuse 10x38 mm 16A 500V FU10X38/16A F1 - F2 5 1 H.V. Diode 80D Measuring resistor RSZ25005R 7 1 Autotransformer 400V - 230V 42ATC230/001 1 Fuse 5x20 mm 1 A 250V FU5X20T/1A F3 8 1 Board Holder MOPHOEN/ Control board File: FX740T_r0eng - Ottobre Manuale per: FX 740 T page 3 di 7

5 Connection Instructions I) The power supply unit must necessarily be earthed by means of the input earth terminal (the first one on your left looking from the terminal side) with a 2.5mm ² cable; II) The head must be connected to the power supply unit by means of the earth wire on the earth screws of the head and of the power supply unit; for safety reasons, another earth wire must be placed on the earth terminal on the head. III) The connections between the head and the power supply unit are carried out by means of terminals: do not turn the power supply on if all the cables are not correctly connected in their positions. IV) Apart from the connection cables to the head, the connections to the START (temporary contact, normally open), STOP (contact normally closed) button and to the INTERLOCK chain are required (closed contact to supply power). If INTERLOCK is not to be used, terminals 17 and 18 can be connected together on terminal board. NOTE: While it is absolutely compulsory for the START button to be in temporary contact, the STOP and INTERLOCK, may be done by a permanent command (i.e. stopping the power supply when the contact is open). V) Install an external switch in order to disconnect the main power supply, to be used each time maintenance operations must be carried out on the power supply unit. VI) The characteristics of the external switch must comply with the EN standard, it must be installed near the power supply unit and easily reachable by the user. VII) In order to carry out the connection to the numbered terminal board, remove the M320 card from the special guides; use the yellow extractors present on the card widening at the same time the hooks blocking the card present on the guides. Carry out this operation as well as the reinsertion of the card only when the mains is not connected. Failure to comply with these instructions is dangerous for those who use the equipment, apart from the possibility to cause equipment breakdowns. Power-up procedure Complete the connection correctly before setting at work. Caution: if the power supply unit is powered without the provided high-voltage connection between the power supply unit and the magnetron, it is impossible to start the continuous power output, but on the outgoing Faston pin there is a dangerous voltage; DO NOT restore the highvoltage connection before discharging the capacitor to earth. Caution: connect with a direct cable the earth screw of the head with the earth screw of the power supply unit. Failure to make this connection may cause danger of death! Activate the external switch to power the equipment: the presence of the mains is indicated by the POWON pilot light on the M320 card. Wait at least 15 seconds for the pre-heating of the magnetron filament. Activate the microwave output power by pressing the START button. The output of the unit is interrupted when: 1) the STOP key is pressed (opening of the NC circuit of the stop) 2) the INTERLOCK chain (temporary or permanent opening of the NC interlock circuit) is opened 3) the safety thermostat (T=132 C) placed in the highvoltage transformer TR2 is opened. 4) the safety thermostat (T=100 C) placed on the Magnetron is opened. There are also two other safety mechanisms: a) the first one stops the output if the anodic current drops below the minimum current threshold (approx. 40% of the rated current). For example, this may depend on the opening of the high-voltage circuit. b) The second one stops the output if the anodic current exceeds the over-current threshold. (approx. 20% more than the rated current). For example, this may occur in case of short-circuit to earth of the high-voltage connection, or in case of current leakage due to moisture or dust along the high-voltage path. page 4 di 7 File: FX740T_r0eng - Ottobre Manuale per: FX 740 T

6 After activating START, if no interlocked conditions are present, the ENABLE led is lit on M320. Within 10 seconds from the start, the filament voltage limitation relay is switched: the MWON led is fully lit and the filament voltage drops to an appropriate value. NOTES: When START is activated, no energy is supplied if any of the breakdowns mentioned above occurs. Do not continue pressing the START key if you do not obtain any result. Search the cause of the breakdown. Never use a permanent-contact switch instead of the START button, otherwise the interventions of the safety mechanisms are cancelled. Before removing the M320 card, turn off the power by opening the external switch. Never remove the M320 card from the guides during the operation, even if it is set to STOP. Always open the external switch before replacing the fuse or making connections to the power supply unit. File: FX740T_r0eng - Ottobre Manuale per: FX 740 T page 5 di 7

7 Wiring diagram FX740T with Generator TXA20 TXA20 MAGNETRON 2M130 AIR cooling GROUND SCREW Attention: you must connect the ground screw of the MW generator to the ground screw of the Power supply; failure to comply with this may involve risks for the staff. TSW1 100 C F FA FA HIGH VOLTAGE CABLE FAN TR3 FILAMENT TRANSFORMER INTERLOCK CHAIN INTLK1 NC GND HEAD CONN. INTLK2 NC START STOP SKBD20 + M320 BOARD M F3 1AT 5x SSRL1 RM1C 60D50 TR1 AUTOTRAFO + - TSW 132 C D1 D815 FASTON M1 PHASE1 M2 PHASE2 F1 16A 10x38 F2 MOV1 480V C1 1.3µF C2 1.3µF 16A 10x38 GND 3 GROUND M3 TR2 HIGH VOLTAGE R1 5ohm 25W FX740T page 6 di 7 File: FX740T_r0eng - Ottobre Manuale per: FX 740 T

8 Physical characteristics Total width: Cabinet height: Cabinet depth: Total weight: 250 mm 260 mm 420 mm 32 kg (70 lbs) Power supplies: Optional: How to order FX740T (no cover) Cover with handles Alter reserves the right to improve or modify this products, at any time, without any obligation to notify any person or entity of such changes. No part of this publication may be reproduced without the express written consent of Alter. Technical Assistance: Alter s.r.l Reggio Emilia - ITALY Tel: ; fax Web: All rights reserved. File: FX740T_r0eng - Ottobre Manuale per: FX 740 T page 7 di 7