20PU20-00 E1 User Manual
Contents
1. do not disassemble or attempt to the MEN PSU family MEN Mikro Elektronik GmbH 15 20PU20 00 E1 2014 06 30 Connecting the PSU 2 Connecting the PSU The PU20 must be connected via the H15 connector at the rear of the unit Connector type 15 pin H15 receptacle according to IEC 60603 2 Mating connector 15 pin H15 plug according to IEC 60603 2 Table 1 Pin assignment of rear H15 PSU connector 6 Vo1 4 Vol 10 Vo2 8 Vo1 Bii 14 5 V Standby 12 S 18 Vo2 16 T1 22 FAL 20 Vo3 M 26 PUL i 24 DEG 2 30 Vis 28 PE 32 Vi Note Pin 32 is longer than the other pins Table 2 Signal mnemonics of PSU interfaces Pin Signal Function 4 Vol Output 1 pos 5VDC 6 Vol Output 1 pos 5VDC 8 Vo1 Output 1 neg GND 10 Vo2 Output 2 neg GND 12 S Sense sense 5VDC 14 5 V Standby 5V Standby 16 T1 5V current share 18 Vo2 Output 2 pos 12VDC 20 Vo3 Output 3 pos 3 3VDC 22 FAL Input_Voltage_Good 24 DEG OverTemp 26 PUL i PS_ON 28 PE Prot Earth PE 30 Vi Input pos 32 Vi Input neg MEN Mikro Elektronik GmbH 16 20PU20 00 E1 2014 06 30 Connecting the PSU 2 1 Parallel Mode The PU20 can be used in parallel with up to six additional units from the MEN PSU family which are easily scalable so that the required output power can be achieved This not only increases the output power but also allows bala2. SAS 18 rue Ren Cassin ZA de la Ch telaine 74240 Gaillard Phone 33 0 450 955 312 Fax 33 0 450 955 211 E mail info men france fr www men france fr USA MEN Micro Inc 860 Penllyn Blue Bell Pike Blue Bell PA 19422 Phone 215 542 9575 Fax 215 542 9577 E mail sales menmicro com www menmicro com Contents Contents 1 Getting Started osos hb soy E PR EGRE REIR OR RR UR RR lero 15 LJ MapOrihe Board soda nd tanon eng aout od ou pado 15 1 2 Integrating the Board into a System 0 0 000 008 15 2 Connecting the PSU 4 5552 od E ERR tor e RR CY sees assem 16 2 1 Parallel 2292 anter pr tae bea Shs dead QE Prud 17 2 4 Redundant Modes dresse th e eer ee eee anak Peer POP 17 2 3 Using an Integrated Shelf Controller llle esee 17 3 Functional Description ses eer rrr rr rrr rr hr rrr 18 3 Voltage Range Compliance 5oedopeer c bb uer ePIT PITE PES 18 3 1 1 Automatic Voltage Range Detection 18 3 1 2 Manual Voltage Range Configuration 18 3 1 3 X Voltage Variations or Interruptions 18 3 1 4 Inrush Current and Reverse Polarity Protection 19 3 2 Voltage and Current Management sees eee re e e 19 3 2 1 Output Voltages i c arbem t tetas es eee 19 2 2 2 Standby Voltage dass e bw arbre gece 19 22 9 oad Sharngzr ssnsd assessed 1446454 1b466au tana 20 3 3 Status Signals and LED 125 2p hey rem rem d Pound 21 24 sold
3. coated conformally and all components are secured against vibration When more power supplies run in parallel the performance loss is shared evenly and in case of a fault in one of the power supplies the output power is removed completely so as to avoid any negative effects The double power monitoring ensures that the output voltage is within the valid range In case of error the voltage is powered down as prepared by the SIL applications The thermal stress is extremely low due to integrated heat sinks and diversion of dissipated heat over the mounting surface The PU20 is fully compliant with EN 50155 meeting all shock vibration EMC and isolation requirements Operating under temperatures ranging from 40 to 70 C with increments to 85 C for 10 minutes class TX with a hold up time of 10 ms as is in accordance with EN 50155 Class 2 MEN Mikro Elektronik GmbH 2 20PU20 00 E1 2014 06 30 Diagram Diagram Q Rear I O connector EMC Surge Protection Failure Switch Off Input Voltage Range BE Definition 5 VDC OUT Voltage Monitoring unit 3 3 VDC OUT Standby power 5 VDC H15 Automatic Current sharing control Voltage Range 5 VDC SENSE Detection OverTemp Output voltage fail PS ON amp Input power good MEN Mikro Elektronik GmbH 3 20PU20 00 E1 2014 06 30 Technical Data Technical Data Input Characteristics Nominal voltage input 24 V 36 V 48 V 72 V 96 V 110 V according to EN5
4. short circuit will not cause any damage to the PSU 3 2 2 Standby Voltage The standby voltage of 5 VDC is also available when all other voltages are switched off After removal of the power the 5 VSB standby voltage output remains steady for a minimum hold up time of 16 ms until the output begins to decrease in voltage There are no other voltage disturbances at or following the removal of DC power If the standby voltage is not used when the output voltages are switched off the PU20 will have a power consumption of less than 0 5 W Standby voltage supports the following functions Wake on LAN Wake on WLAN System Management Controller RTC application e Suspend to RAM application MEN Mikro Elektronik GmbH 19 20PU20 00 E1 2014 06 30 Functional Description 3 2 3 Load Sharing The PU20 includes an active power sharing feature This ensures that each of the paralleled PSUs contribute an equal share of the current to the load which avoids any supply output from drifting higher than the others and prevents premature failure of the power supply The maximum power output over all voltages for the entire temperature range with convection airflow is 120 W The load sharing is between 12 VDC and 5 VDC output including 3 3 VDC which has a minimum of 35 W output power The switch on behavior of the output voltages is independent of the load so the dynamic load sharing has no effect on it All output voltages have a maxim
5. 0155 Max input power range of 14 6 to 156 VDC Automatic input voltage range detection for 24 72 110 VDC Configurable voltage range for 36 48 74 96 VDC Power on off threshold nput voltage range Nominal input voltage of 74 VDC provided according to S 9401 Voltage range for 74 VDC is 20 to 130 VDC Power Variations No functional disturbance with input voltage variations of 0 6 x Un lt 1 4 x Un for 0 1 s No functional disturbance with input voltage variations of 1 25 x Un lt 1 4 Un for 1 s nrush current limiting Output Characteristics Output voltages 12 VDC 5 VDC and 3 3 VDC Standby output voltage 5 VDC with a 5 W load Accuracy Max 1 of the nominal value Holdup time 10 ms according to Class S2 Dynamic load distribution 120 W for complete temperature range without forced airflow Load sharing between 12 VDC output and 5 VDC output including 3 3 VDC Connection Type H15 DIN 41612 plug connector Control and Status Indicator Three ports on secondary side Switches output voltages Indicates input power failure output voltage failure or fail over temperature Parallel connection Up to six power supply units can be used in parallel Extends availability backup protection against faults Extends power Increases performance Ensures redundancy MEN Mikro Elektronik GmbH 4 20PU20 00 E1 2014 06 30 Technical Data Miscellaneous Overload and short cir
6. 20PU20 00 E1 2014 06 30 PU20 Wide Range PSU for 19 Railway Systems 24 to 110 VDC 120 W Anean PU20 Wide Range PSU for 19 Railway Systems 24 to 110 VDC 120 W PU20 Wide Range PSU for 19 Railway Systems 24 to 110 VDC 120 W The PU20 is a plug in power supply unit for 19 systems like VMEbus and CompactPCIG Serial It is especially designed for computer systems in public transport vehicles and for harsh environments like railway applications making it suitable for both onboard and wayside use The PU20 has a nominal input power range of 24 V to 110 V with a max input voltage range of 14 6 to 156 VDC according to EN 50155 and S 9401 It also has an automatic input voltage range detection for 24 72 110 VDC to define the under voltage level Additionally the PU20 has a configurable voltage range for 36 48 74 96 VDC which is controlled by a rotary switch The standard output voltage is 5 V with a dynamic load sharing of between 12 and 5 V with 120 W The output power at 3 3 V is 35 W which is shared with the 5 V load Switch on behavior is independent of the load The PU20 also has a standby voltage of 5 V with 5W to supply the independent shelf controller and to support wake on LAN functionality The PSU provides three ports on the secondary side for switching the output voltages They also indicate the event of an input power failure output voltage failure or a fail over temperature The PSU is
7. REOR on deer QUe es B be din eem ido 22 Isolation vollages erretenaren on Lian aud dues x d RU US cad 22 14 Getting Started 1 Getting Started This chapter contains a general overview of the board and some information regarding the initial installation in a system 1 1 Map of the Board Figure 1 Map of the board front panel and top view Coe Mounting screw PSU DC DC 120W H15 Connector Rear NS output ok vibe output FAIL P2 1 N INPUTFAIL l C9 status LEDs 3 w e e Mounting screw Handle Rotary Switch 12 Integrating the Board into a System This chapter contains important information regarding initial installation of the PU2O M The PU20 is hot pluggable it is therefore not necessary to shut down the host system during installation there will also be no significant interruptions to the system while installing or replacing this unit M Only operate the PU20 in a suitable housing i e in such a way that no parts of the PU20 except the front panel can be touched MI Make sure that enough convection airflow is provided K Do not remove any covers or other mechanical parts MI The guiderails should be made of synthetic material and not touch any compo nents repair the power supply unit Replace it only with the specified units from h To reduce the risk of electrical shock
8. Voltage Output Voltages reference reference Repeated switching on and off of the DC input voltage with a maximum load will not cause any damage to the power supply nor will it cause the input fuse to blow The PU20 is compliant to the CPCI 3U standard and has a width of not more than 6HP A CCA version of the PU20 is also available and is 3U and 5HP compliant to the CPCI S 0 specifications It is also possible to integrate CPCI S 3U boards on both sides of the power supply unit without any additional space necessary between boards The PU2O is available in two models Voltage range from 14 4 VDC to 156 VDC Voltage range from 9 VDC to 36 VDC MEN Mikro Elektronik GmbH 23 20PU20 00 E1 2014 06 30 Appendix 5 Appendix p 5 1 Literature and Web Resources a PU20 data sheet with up to date information and documentation bz www men de products 17pu20 html 5 2 Finding out the Board s Article Number Revision and Serial Number MEN user documentation may describe several different models and or hardware revisions of the PU20 You can find information on the article number the board revision and the serial number on two labels attached to the board Article number Gives the board s family and model This is also MEN s order ing number To be complete it must have 9 characters Revision number Gives the hardware revision of the board Serial number Unique identification assigned during
9. ain the original packaging in case you need to return the board to MEN for repair Computer boards and components contain electrostatic sensitive MEN Mikro Elektronik GmbH 7 20PU20 00 E1 2014 06 30 About this Document About this Document This user manual is intended only for system developers and integrators it is not intended for end users It describes the hardware functions of the board connection of peripheral devices and integration into a system It also provides additional information for special applications and configurations of the board The manual does not include detailed information on individual components data sheets etc A list of literature is given in the appendix History Issue Comments Date E1 First issue 2014 06 05 E2 Updated photos and front panel cosmetics only 2014 06 30 MEN Mikro Elektronik GmbH 8 20PU20 00 E1 2014 06 30 About this Document Conventions personal injury or damage or destruction of the component Indicates important information or warnings concerning proper Indicates important information or warnings concerning the use of voltages that could lead to a hazardous situation which could result in A functionality of the product described in this document The globe icon indicates a hyperlink that links directly to the Internet b 2 where the latest updated information is available When no globe icon is present th
10. ariations of 0 6 x Un up to 1 4 Un for less than 0 1s and 1 25 x Un up to 1 4 x Un for less than 1s will not cause any functional disturbance The PU20 is compliant with class S2 of EN50155 power interruption and input short circuit regulations Interruptions of up to 10 ms will not lead to any disturbances The PU20 is unconditionally stable under all load conditions including capacitive load see Table 4 Capacitive Load on page 20 MEN Mikro Elektronik GmbH 18 20PU20 00 E1 2014 06 30 Functional Description 3 1 4 Inrush Current and Reverse Polarity Protection The PU20 is equipped with an inrush current limiter to protect the components from damaging levels of inrush current at start up which could lead to a reduction of equipment life The PSU provides a reverse polarity protection using active switchable transistors to provide minimum power dissipation 3 2 Voltage and Current Management 3 2 1 Output Voltages The output voltages of the PU20 are 12 VDC 5 VDC and 3 3 VDC The unit also supplies a standby voltage of 5 VDC with 5 W In the event of an internal fault all output voltages are protected against an under or over voltage of approximately 5 All output voltages are also protected against overload and short circuits In the event of an overload the output switches itself off An output overload occurs with a load of 20 more than the maximum load which lasts longer than 1 second An overload and
11. ce The PU20 is fully compliant with the voltage requirements for input voltages as specified by the EN50155 railway standards and provides the nominal input voltages 24 26 48 72 96 and 110 VDC In addition the PU20 also provides the possibility to extend the power input with an assembly option which allows an input range from 9 up to 36 VDC The PU20 is also compliant with the S 9401 Standard for Railroad Electronics Environmental Requirements and provides a nominal input voltage of 74 VDC with a voltage range of 20 to 130 VDC 3 1 1 Automatic Voltage Range Detection The PU20 has an automatic voltage range detection for voltages 24 72 and 110 VDC The automatic voltage detection feature helps ensure automatic switch off when necessary to avoid overloads and to protect the batteries if used against discharging when there is a drop in voltage in an electrical power supply 3 1 2 Manual Voltage Range Configuration The automatic voltage range detection only detects voltages 24 72 and 110 VDC In order to compensate for the other voltages and cover the entire range the PU20 also features a rotary switch which allows the voltages to also be manually configured to 36 48 74 or 96 VDC Table 3 Automatic and configurable voltage range overview Rotary Switch Configurable Automatic Detection 36 VDC 24 VDC 48 VDC 72 VDC 74 VDC 110 VDC 96 VDC 3 1 3 Voltage Variations or Interruptions Input voltage v
12. cuit protection e Standby voltage at power down always available Reverse polarity protection for input voltage and short circuit Output voltage and temperature supervision Overtemperature and overvoltage shutdown Status LED on front panel Electrical Specifications solation according to EN 50155 Input output 3100 VAC Input shield 3100 VAC Output shield 1000 VAC Mechanical Specifications Dimensions 3U 5HP ntegrated heat sink Weight tbd Environmental Specifications Temperature range operation 40 to 70 C 85 C 10 mins no derating Temperature range storage 50 to 85 C Temperature 70 C with up to 85 C for 10 minutes according to class Tx EN 50155 EMC Emission EN 55022 CISPR 22 Class B FCC 15 109 and S 9401 e EMC Immunity EN 55024 Class A Airflow convection cooling Cooling test according to EN 60068 2 1 Dry heat test according to EN 60068 2 2 Shock 50 m s 30 ms EN 61373 Vibration function 2 02 m s 5 Hz to 200 Hz EN 61373 Vibration lifetime 11 44 m s 5 Hz to 200 Hz EN 61373 MTBF min 600 000h 40 C according to IEC TR 62380 RDF 2000 Safety Flammability PCB manufactured with a flammability rating of 94V 0 by UL recognized manufacturers Hlectrical Safety EN 60950 1 Insulation measurement test according to EN 50155 12 2 9 1 Voltage withstand test according to EN 50155 12 2 9 2 MEN Mikro Elektronik GmbH
13. e hyperlink links to specific elements and information within this document italics Folder file and function names are printed in italics bold Bold type is used for emphasis mono A monospaced font type is used for hexadecimal numbers listings C function descriptions or wherever appropriate Hexadecimal numbers are preceded by 0x comment Comments embedded into coding examples are shown in green text IRQ Signal names followed by a hashtag or preceded by a forward RQ slash indicate that this signal is either active low or that it becomes active at a falling edge in out Signal directions in signal mnemonics tables generally refer to the corresponding board or component in meaning to the board or component out meaning from it the board or component Blue vertical lines in the outer margin indicate sections where changes have been made to this version of the document MEN Mikro Elektronik GmbH 9 20PU20 00 E1 2014 06 30 About this Document Legal Information Changes MEN Mikro Elektronik GmbH MEN reserves the right to make changes without further notice to any products herein Warranty Guarantee Liability MEN makes no warranty representation or guarantee of any kind regarding the suitability of its products for any particular purpose nor does MEN assume any liability arising out of the application or use of any product or circuit and specifically disclaims any and all liability i
14. ental conditions is limited to the individual requirement specification and subsequent validation documents for each product for the applicable use case and has to be agreed upon in writing by MEN and the customer Should the customer purchase or use MEN products for any unintended or unauthorized application the customer shall indemnify and hold MEN and its officers employees subsidiaries affiliates and distributors harmless against all claims costs damages and expenses and reasonable attorney fees arising out of directly or indirectly any claim or personal injury or death associated with such unintended or unauthorized use even if such claim alleges that MEN was negligent regarding the design or manufacture of the part In no case is MEN liable for the correct function of the technical installation where MEN products are a part of Trademarks All products or services mentioned in this publication are identified by the trademarks service marks or product names as designated by the companies which market those products The trademarks and registered trademarks are held by the companies producing them Inquiries concerning such trademarks should be made directly to those companies Conformity MEN products are no ready made products for end users They are tested according to the standards given in the Technical Data and thus enable you to achieve certification of the product according to the standards applicable in your field of applicati
15. ino terrere 245 pd etude due eh Oia domaine aos 22 3 41 Isolation Groups i is e Rr Rt hm ee 22 2042 Isolation Voltages ossos eed eR REESE TR SEES 22 3 General IMOPMAlON a 0645414 66E I PERPPRMOERDPE SEDED QE DIE PEE 23 5 ADD6OnDdI cuore PPCPPUUNP ER TUS Gab seio dine ciste siefelp sisse 24 5 1 Literature and Web RESOULCES cre deer seen dert ames 24 5 2 Finding out the Board s Article Number Revision and Serial Number uo vk Reps eda 24 MEN Mikro Elektronik GmbH 12 20PU20 00 E1 2014 06 30 Figures Figure 1 Figure 2 Figure 3 Figure 4 MEN Mikro Elektronik GmbH 20PU20 00 E1 2014 06 30 Map of the board front panel and top view 0 5 15 PUO Status BIS e on avec tutt aoa contigo ed etre etate os 21 Sately dppliCalloli v uuo cred bre sed eq Ue sie weiss 23 Labels with the article number revision and serial number of th Doard iuo vios iu mper es p SERE Ede 24 Tables Table 1 Table 2 Table 3 Table 4 Table 5 Table 6 Table 7 Table 8 MEN Mikro Elektronik GmbH 20PU20 00 E1 2014 06 30 Pin assignment of rear HIS PSU connector 0 16 Signal mnemonics of PSU interfaces eee 16 Automatic and configurable voltage range overview 18 Capacitive Load 424r ck eR RP ES eae EEEE Re 20 Status signals on the front panel coe errekto tois 21 Yellow status LED on the front panel 0005 21 Isolation STOUPS sie 3 920 9 HERE
16. n circuit the DC output voltages do not deliver current The PU20 also provides a yellow LED which displays the correct output voltage range The LED is located on the front panel of the unit The LED status assignments are as follows Table 6 Yellow status LED on the front panel Yellow LED Function LED on Output voltages are in valid range LED blinking Output voltages are not in valid range LED off Input voltage range is not valid MEN Mikro Elektronik GmbH 21 20PU20 00 E1 2014 06 30 Functional Description 3 4 Isolation 3 4 1 Isolation Groups The PU20 provides the following isolated groups Table 7 Isolation groups Group Name Primary power voltage input 2 Secondary power all outputs and status ports 3 Shield 3 4 2 Isolation Voltages The PU20 can withstand high voltages according to the following table Table 8 Isolation voltages Group 1 2 3 2 3100 VAC 3 3100 VAC 1000 VAC MEN Mikro Elektronik GmbH 22 20PU20 00 E1 2014 06 30 General Information 4 General Information The PU20 features a catastrophic failure protection function and voltage accuracy is consistently double checked In the event of one unit failing another unit will continue to check the accuracy and switch all voltages off if necessary before any thermal damage is caused Figure 3 Safety application DC DC converter Input
17. nced dissipation loss for all units which leads to a better MTBF 2 2 Redundant Mode The PU20 can also be used in a redundant configuration Redundancy maximizes the availability of a system in critical applications In addition reliability is enhanced as the modules are operating below the full output current rating thereby reducing power dissipation and temperature rise An output voltage fault or the complete failure of one power supply will not affect the remaining PSUs F The PU20 can be used in parallel with the PU21 which is also available gt from MEN 2 3 Using an Integrated Shelf Controller When using multiple PSUs an independent shelf controller can be installed between two units The shelf controller allows communication between units and controls and supervises the speed of up to three cooling fans The shelf controller also provides a front panel display which displays the PSU supply status and hosts the power button 3 For more information on the shelf controller please refer to the host b 2 system manual An overview of complete systems and documentation is available on the MEN website MEN Mikro Elektronik GmbH 17 20PU20 00 E1 2014 06 30 Functional Description 3 Functional Description The functions described in the following chapter depend on the firmware This user manual describes the functions realized in the current MEN standard firmware 3 1 Voltage Range Complian
18. ncluding without limitation consequential or incidental damages TO THE EXTENT APPLICABLE SPECIFICALLY EXCLUDED ARE ANY IMPLIED WARRANTIES ARISING BY OPERATION OF LAW CUSTOM OR USAGE INCLUDING WITHOUT LIMITATION THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE OR USE In no event shall MEN be liable for more than the contract price for the products in question If buyer does not notify MEN in writing within the foregoing warranty period MEN shall have no liability or obligation to buyer hereunder The publication is provided on the terms and understanding that 1 MEN is not responsible for the results of any actions taken on the basis of information in the publication nor for any error in or omission from the publication and 2 MEN is not engaged in rendering technical or other advice or services MEN expressly disclaims all and any liability and responsibility to any person whether a reader of the publication or not in respect of anything and of the consequences of anything done or omitted to be done by any such person in reliance whether wholly or partially on the whole or any part of the contents of the publication Conditions for Use Field of Application The correct function of MEN products in mission critical and life critical applications is limited to the environmental specification given for each product in the technical user manual The correct function of MEN products under extended environm
19. oJ 20PU20 00 E1 2014 06 30 Configuration Options EMC Conformity EN 55011 radio disturbance EC 61000 4 2 ESD EC 61000 4 3 electromagnetic field immunity EC 61000 4 4 burst EC 61000 4 5 surge EC 61000 4 6 conducted disturbances Configuration Options Output voltage Available in two different models 14 4 VDC to 156 VDC 9 VDC to 36 VDC Cooling Concept Also available with conduction cooling in MEN CCA frame Please note that some of these options may only be available for large volumes Please ask our sales staff for more information d For available standard configurations please see the online data sheet MEN Mikro Elektronik GmbH 6 20PU20 00 E1 2014 06 30 Product Safety Product Safety Electrostatic Discharge ESD devices Electrostatic discharge ESD can damage components To protect the board and other components against damage from static electricity you should follow some precautions whenever you work on your computer Power down and unplug your computer system when working on the inside Hold components by the edges and try not to touch the IC chips leads or circuitry Use a grounded wrist strap before handling computer components Place components on a grounded antistatic pad or on the bag that came with the component whenever the components are separated from the system Only store the board in its original ESD protected packaging Ret
20. on MEN Mikro Elektronik GmbH 10 20PU20 00 E1 2014 06 30 About this Document RoHS Since July 1 2006 all MEN standard products comply with RoHS legislation Since January 2005 the SMD and manual soldering processes at MEN have already been completely lead free Between June 2004 and June 30 2006 MEN s selected component suppliers have changed delivery to RoHS compliant parts During this period any change and status was traceable through the MEN ERP system and the boards gradually became RoHS compliant WEEE Application The WEEE directive does not apply to fixed industrial plants and tools The compliance is the responsibility of the company which puts the product on the market as defined in the directive components and sub assemblies are not subject to product compliance In other words Since MEN does not deliver ready made products to end users the WEEE directive is not applicable for MEN Users are nevertheless recommended to properly recycle all electronic boards which have passed their life cycle Nevertheless MEN is registered as a manufacturer in Germany The registration number can be provided on request Copyright 2014 MEN Mikro Elektronik GmbH All rights reserved Germany MEN Mikro Elektronik GmbH Neuwieder Strafe 3 7 90411 Nuremberg Phone 49 911 99 33 5 0 Fax 49 911 99 33 5 901 E mail info men de www men de MEN Mikro Elektronik GmbH 20PU20 00 E1 2014 06 30 France MEN Mikro Elektronik
21. production If you need support you should communicate these numbers to MEN Figure 4 Labels with the article number revision and serial number of the board Complete article number 17PU20 00 00 00 00 Revision number Serial number MEN Mikro Elektronik GmbH 24 20PU20 00 E1 2014 06 30
22. um accuracy of approximately 1 of their nominal value The maximum over and under shoot at all outputs is less than 4 2 of its nominal voltage Each output voltage of the PU20 is able to power up and operate within regulation limits and with simultaneous capacitances as shown in the table below Table 4 Capacitive Load Output Capacitive load pF 12 VDC 10 000 5 VDC 10 000 3 3 VDC 10 000 5 VDC standby 5 000 MEN Mikro Elektronik GmbH 20 20PU20 00 E1 2014 06 30 Functional Description 3 3 Status Signals and LED The PU20 provides three ports on the secondary side for switching output voltages as well as indicating the event of an input power failure output voltage failure or a fail over temperature Figure 2 PU20 Status LEDs output ok vi OurTPUTFAIL l NX O _ INPUT FAIL L co Status LED The signal assignments are as follows Table 5 Status signals on the front panel Signal Function Input Power Good Indicates when input voltage is within the valid range Indicates when input voltage falls below the under voltage threshold Over temperature Indicates when the temperature is within 15K of a thermal output power shut down or output voltage fail PS_ON Allows CPU to remotely control the power supply for soft Active low and TTL on off and wake on lan compatible TTL low the three main DC output voltages are turned on TTL high or ope
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