Soundcraft cps250-275-user-guide 电路图.pdf

SOUNDCRAFT CPS250 CPS275 Console Power Supply User and Technical Manual IMPORTANT: please read this manual carefully before connecting your Soundcraft console power supply to the mains for the first time. For your own safety and to avoid invalidation of the warranty all text marked with these Warning Symbols should be read carefully. RadioFans.CN 收音机爱 好者资料库 Harman International Industries Ltd. 1997 All rights reserved Parts of the design of this product may be protected by worldwide patents. Part No. ZM0195 Issue 3 Soundcraft is a trading division of Harman International Industries Ltd. Information in this manual is subject to change without notice and does not represent a commitment on the part of the vendor. Soundcraft shall not be liable for any loss or damage whatsoever arising from the use of information or any error contained in this manual, or through any mis-operation or fault in hardware contained in the product. No part of this manual may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, electrical, mechanical, optical, chemical, including photocopying and recording, for any purpose without the express written permission of Soundcraft. It is recommended that all maintenance and service on the product should be carried out by Soundcraft or its authorised agents. Soundcraft cannot accept any liability whatsoever for any loss or damage caused by service, maintenance or repair by unauthorised personnel. Harman International Industries Ltd. Cranborne House Cranborne Industrial Estate Cranborne Road Potters Bar Herts. EN6 3JN England Tel: 01707 665000 Fax:01707 660482 RadioFans.CN 收音机爱 好者资料库 Table of Contents Introduction1 Introduction2 Short-circuit Protection2 Mains Voltage Selection3 Replacing Mains Fuse3 Warranty4 Recommendations For Installation5 Recommendations For Installation6 General7 Dimensions8 PSU Linking (CPS275 Only)8 Technical Specification9 Technical Description11 Circuit Diagram (1)12 Circuit Diagram (2)13 Circuit Description14 Servicing17 PCB Layout20 Output Pinouts21 Parts List23 i RadioFans.CN 收音机爱 好者资料库 ii Introduction Introduction1 Introduction WARNING: THIS APPARATUS MUST BE EARTHED The CPS250/CPS275 are linear power supplies which, like other linear supplies, produce DC voltages by rectifying, smoothing and regulating AC voltages from the secondary windings of a mains transformer. Soundcraft mixing consoles employ a number of dc voltage supply levels in their operation and these are all provided at the output of each supply unit. The CPS275 provides higher currents than the CPS250. The CPS275 also has the capability of being linked to a second CPS275 to provide automatic power backup in the event of one of the units failing. In regulating these voltages there is considerable heat generated, the dissipation of which is achieved through a substantial internal heat sink. A fan is incorporated which draws air over the heatsinks to provide adequate heat dissipation for the regulators and reduce the outer case temperature. The CPS250/CPS275 is designed for installation in a 19 rack unit, occupying 2U of rack height. Refer to the section RECOMMENDATIONS FOR INSTALLATION on Page 5. LED indication is provided on the front panel to show operation of the regulating circuits. SHORT-CIRCUIT PROTECTION The +/-17V rails can withstand a short to ground or each other for up to one second; if the short circuit remains for longer than one second then both of the 17V rails will be shut down. To reset them the supply must be switched off for 6 seconds and then switched on again. The +5V and +48V are current limited and will self recover when any short circuit is removed. 2Introduction MAINS VOLTAGE SELECTION Special attention should be paid to the following information: Do not change the voltage setting without first turning the unit off and unplugging the mains lead. This unit is capable of operating over a range of mains voltages by means of a 4-position mains input fuse carrier. It is important to ensure that the correct voltage setting is selected for the level of local mains voltage supply, for safe, uninterrupted operation of the unit. Voltage selection is achieved by positioning the fuse carrier so that the required voltage appears next to the arrow which is moulded in the connector. In this way the unit is set up for operation at one of the following ranges of mains supply: NOMINAL VOLTAGE OPERATING VOLTAGE RANGE (+10/-15%) Vrms AC Vrms AC 230196 - 253 11598 - 126 10085 - 110 8573 - 93 To remove the fuse use a small screwdriver to prise the fuse carrier from its location in the connector. To avoid risk of fire use the correct value fuse, as indicated on the unit. REPLACING MAINS FUSE Switch the ON/OFF switch to the OFF position. Remove the mains lead from the connector. Use a small screwdriver to prise the fuse carrier from its location in the connector. Check the fuse and replace if necessary; also check that the voltage selection is correct for the mains supply level before switching the unit ON again. In the event of repeated failure of the mains fuse consult the Soundcraft dealer from where the unit was purchased. This unit contains no user serviceable parts. Refer all servicing to a qualified service engineer, through the appropriate Soundcraft dealer. Introduction3 1Soundcraft is a trading division of Harman International Industries Ltd. End User means the person who first puts the equipment into regular operation. Dealer means the person other than Soundcraft (if any) from whom the End User purchased the Equipment, provided such a person is authorised for this purpose by Soundcraft or its accredited Distributor. Equipment means the equipment supplied with this manual. 2If within the period of twelve months from the date of delivery of the Equipment to the End User it shall prove defective by reason only of faulty materials and/or workmanship to such an extent that the effectiveness and/or usability thereof is materially affected the Equipment or the defective component should be returned to the Dealer or to Soundcraft and subject to the following conditions the Dealer or Soundcraft will repair or replace the defective components. Any components replaced will become the property of Soundcraft. 3Any Equipment or component returned will be at the risk of the End User whilst in transit (both to and from the Dealer or Soundcraft) and postage must be prepaid. 4This warranty shall only be available if: a) the Equipment has been properly installed in accordance with instructions contained in Soundcrafts manual; and b) the End User has notified Soundcraft or the Dealer within 14 days of the defect appearing; and c) no persons other than authorised representatives of Soundcraft or the Dealer have effected any replacement of parts maintenance adjustments or repairs to the Equipment; and d) the End User has used the Equipment only for such purposes as Soundcraft recommends, with only such operating supplies as meet Soundcrafts specifications and otherwise in all respects in accordance Soundcrafts recommendations. 5Defects arising as a result of the following are not covered by this Warranty: faulty or negligent handling, chemical or electro-chemical or electrical influences, accidental damage, Acts of God, neglect, deficiency in electrical power, air-conditioning or humidity control. 6.The benefit of this Warranty may not be assigned by the End User. 7.End Users who are consumers should note their rights under this Warranty are in addition to and do not affect any other rights to which they may be entitled against the seller of the Equipment. Warranty 4Introduction Recommendations For Installation FOR UK USERS ONLY The wires in the mains lead are coloured in accordance with the following code: Green and Yellow: Blue: Brown: Earth Neutral Live As the colours of the wires in the mains lead may not correspond with the coloured markings identifying the terminals in your plug, proceed as follows: The wire which is coloured Green and Yellow must be connected to the terminal in the plug which is marked with the letter E or by the earth symbol. The wire which is coloured Blue must be connected to the terminal in the plug which is marked with the letter N or coloured Black. The wire which is coloured Brown must be connected to the terminal in the plug which is marked with the letter L or coloured Red. IMPORTANT WARNING THIS APPLIANCE MUST BE EARTHED Installation5 Recommendations for Installation The CPS250/CPS275 power supply is provided with front panel fixing holes for 19 rack-mounting and will occupy 2U of rack space. As with any power supply that contains a large mains-voltage transformer, it is preferable to provide a degree of physical isolation of the unit from other electronic equipment, particularly that which carries low level audio signals, to avoid any possible hum pick-up. For this reason the unit is used with a long (7 metres) output cable to enable it to be positioned away from the mixing console. For the same reason, when rack-mounting it is preferable to avoid locating the unit adjacent to signal processing equipment. It should be noted that if a complete rack containing a CPS250/CPS275 unit is to be operated from a different mains supply level, then the unit should be withdrawn from the rack in order to reselect the mains voltage setting, at the same time as resetting any other equipment. The other important consideration when rack-mounting the unit is the need for natural convection of air over the case and an unrestricted air flow through the unit. Note that air is drawn in at the rear of the unit and expelled through the front panel. Good ventilation BELOW the unit, in the floor or back of the rack, and similarly ABOVE the unit, at the top of the rack, will ensure a path for continuous air flow. Other equipment in the rack which is known NOT to produce a significant amount of heat should be mounted BELOW the unit. Equipment that also relies on good air flow within the rack (ie. most power amplifiers and other power supplies) should be given due consideration and some space should be provided between such units and between these and the CPS250/CPS275 unit. Forced convection, by means of a fan-tray, may be desirable in this situation. The CPS250/CPS275 will operate as a free-standing unit without requiring any special cooling arrangement, but should not be allowed to be accidentally or deliberately covered over in any way. Do not operate the unit with the top cover removed. The air intake and outflow holes must be inspected regularly and cleaned if necessary to maintain good airflow through the unit. This will be particularly important if the unit is used in a dusty environment. Finally, some consideration should be given to the earthing arrangement of the system at the centre of which are the console and the CPS250/CPS275 (and any other Soundcraft power supply units). The console chassis is earthed, through the mains earth, via the power supply. When rack-mounting the CPS250/CPS275(and any other Soundcraft power supply units) care should be taken to avoid any possible ground loops in the system which would introduce audible hum to otherwise clean audio signals. Ground loops may occur where signal processing equipment, patched to the console, has its signal earth commoned to the equipment chassis. The ground loop is 6Installation formed if this chassis and the power supply chassis are in electrical contact through the fixing rails they share in the rack. To avoid this situation, standard isolating washers may be employed when fixing the power supply (or supplies) or any other unit into the rack. W A R N I N G : THIS APPARATUS MUST BE EARTHED. Under no circumstances should the mains earth be disconnected from the CPS250/CPS275 power supply unit. GENERAL As with all electrical/electronic equipment care should be taken when handling this unit. Avoid general mishandling and do not drop. Avoid storage and operation in dusty locations and do not expose to corrosive atmospheres. To avoid risk of fire do not expose this unit to rain or moisture. Retain all packaging for transportation in the event of the unit requiring servicing. Retain this manual safely, along with all other relevant documents. For touring/mobile transportation it is advisable to install the CPS250/CPS275 in a flight case to provide mechanical protection. Refer to your Soundcraft dealer for a suitable case. Where the CPS250/CPS275 is enclosed in a touring case, provision must be made for adequate ventilation to the rear of the unit to ensure unrestricted supply of air for the cooling fan. Use only the high-current mains lead supplied, not the more common 5A type supplied with other equipment. Installation7 88.10mm 9.52mm 5.95mm 5.95mm 350.50mm 427.56mm 482.60mm Dimensions PSU Linking (CPS275 Only) Console (Only one rail shown.) Link Console (Only one rail shown.) Link To Console Standby CPS275 Main CPS275 The output voltages from the CPS275 are fed via diodes as shown in the adjacent diagram. This allows a standby CPS275 to automatically takeover in the event of a power rail failing. When a spare CPS275 is ordered it comes with a 1metre linking cable. This should be connected between the link connectors as shown in the diagram. 8Installation Technical Specification Technical Specification9 Technical Specification MAINS INPUT VOLTAGE RANGE: 85/100/115/230 V AC +10%/-15% 50/60Hz RATED INPUT POWER (Max): CPS250 - 350 WATTS CPS275 - 450 WATTS MAINS FUSE RATING: Use T3.15A/250V (slow-blow) for 230V Use T6.3A/250V (slow-blow) for 85/100/115V OUTPUTS DC. VOLTAGE RAIL MAX. OUTPUT CURRENT CPS250CPS275 +17.5V4.00 AMPS 5.25 AMPS -17.5V 4.00 AMPS 5.25 AMPS +5V 1.00 AMPS1.00 AMPS +48V0.30 AMPS0.30 AMPS All voltage and current measurements are to be taken at the console-end of the power supply cable. OPERATING TEMPERATURE RANGE (Ambient): -10 TO +40C. HUMIDITY: Similar unit tested at 0-90% RH non-condensing +/-5% Relative Humidity at 40 C for 16 hours. Load switched between 20% and 100% at regular 30 minute intervals. OVERALL DIMENSIONS: HEIGHT: (exc. feet)88.10mm. (2U) WIDTH: Chassis 427.56mm. Front panel 482.60mm. DEPTH: (excl. connectors)350.50mm. WEIGHT: (Excl. packing): 11Kg 10Technical Specification Technical Description Servicing should only be carried out by a competent service engineer. SEE THE WARNINGS STARTING ON PAGE 17. Technical Description11 Circuit Diagram (1) 12Technical Description Circuit Diagram (2) Technical Description13 Circuit Description The CPS250 and CPS275 power supplies provide +/-17V at 4 Amps and 5.25 Amps respectively. Both give +5V at 1 Amp, and +48V at 0.3 Amp. The PCB is SC3803. THE +/- 17V RAILS. This consists of two identical +17V supplies connected together to give +/-17V. Each 17V supply is a linear regulator with conventional fullwave rectification and 20,000uF reservoir capacitors. This