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Installation Manual DC/DC converters PSE100, PSE150, PSE200

1. The product is labelled as below example PSE100B24 Input range 20 72 Vd c 6 5 A Output 24V 4 2A Option L C The DC DC converter type name consists of model name PSE100 PSE150 PSE200 and PSE250 followed by input code and output voltage Two examples e Type PSE100B12 has input code B and nominal output voltage 12 Vd c e Type PSE250 110 24 has input code 110 and nominal output voltage 24 Vd c The Options are block letters separated by comma You will find explanation within this manual what the letter code means The input states the nominal input voltage and maximum input current at any conditions It means the output is adjusted 10 above nominal voltage and close to the current limit which is the stated output current 5 and a lowest input voltage level INSTALLATION MANUAL PSE series DC Inputs Input range is the input range that the unit can operate normally Output indicates the nominal output voltage and the rated current The output is current limited with a so called rectangular characteristic When the current limit is reached which is adjusted to 5 of above mentioned nominal output current this is the maximum current that will continuously flow The output voltage drops very quickly down towards zero volt depends on the series resistance of the load circuit as the unit can be regarded as a constant current generator at over current condition We have no
2. are two reasons why we do not include the fuse 1 DC networks should be fused at the distribution point to protect the cable 2 Different applications require different types of fuses A switching device able to switch off both polarity input cables has to be mounted externally The switching device shall be marked accordingly and easy accessible In case the fuse is activated at start up the fuse need to be dimensioned for longer time delay or order inrush current limit see option H next section 2011 04 26 Copyright 2000 2011 Input voltage code Input voltage range BL 20 22 Vdc 50 150 Vdc D 90 270 Vdc PSE with option H Input voltage code Input voltage range 30 72 Vd c D ee ee Table 3 Input voltage range with and without option H The unit starts if the voltage is within the normal input voltage range but depending on the load if the NTC is heated up a load change might cause the converter to stop and start as described before Page 5 14 POLYAMP p 1 5 Series diode on input option K1 Series diode on Input is used of two reasons as reverse voltage protection and if hold up time is specified Depending on input voltage the unit will be derated due to the diode losses A series diode as reverse voltage protection is recommended if long distance between input fuse and unit input gt 3 m 2 Installation The converter is designed to be mounted in a 3U 19 sub rack unit Oth
3. contact output is also available as an option see section 8 page 11 ch Figure 2 An N 1 system with two units for the load and one for the redundancy 3 4 Connecting systems in N 1 configuration The figure 2 shows a N 1 system with two units for the load and one for the redundancy Each Power supply has a built in series diode C balancing resistor R and alarm Relay option B The alarm is cascade connected Note that each DC DC converter has individual external input fuses With the CR option a hot plug in can be achieved if the output voltage is correctly adjusted Use instruction section 3 6 3 below 2011 04 26 INSTALLATION MANUAL PSE series DC Inputs 3 5 Connecting converters in parallel on the output The expected life of the converter is dependant on converter temperature It is therefore important for paralleled unit to share the load as equal as possible to reduce the converter temperature To achieve good current sharing the converters must have separate cables to the load The cables should be dimensioned to have a voltage drop Ud between the converter and the load at maximum current capacity see Figure 3 and Figure 4 e When the series diode is used which we recommend the voltage drop should be approximately 1 0 of nominal output voltage to also compensate for the negative temperature coefficient of the diode e When the series diode is not used this is not recommended the voltage drop
4. gives you that At 10ms The output voltage is 24V and you can accept 10 voltage drop gt AU 24 x 0 1 2 4V The capacitance you need is C 1 2x ISxAt AU 1 2x 10x 0 01 2 4 50 000uUF Select a capacitance with a rated voltage of at least 115 of nominal output voltage of the converter Repeat this calculation for all branches and choose the highest capacitance value It is sometimes difficult to estimate the short circuit current when the nature of a fault is unknown In this case a voltage dip might appear under some shortcircuit conditions even with a large capacitor present If a voltage dip is critical in one branch it is recommended to use a separate DC DC converter supplying this branch 5 Output voltage sense option S The remote voltage sense is used to improve the regulation at the load The voltage regulation is moved to a point outside the converter where the sense Is connected Longer sense leads than 3 m is not recommended The voltage difference between the load and the converter should not be larger than the output voltage range Use twisted sense wires see Figure 8 Page 10 14 POLYAMP p INSTALLATION MANUAL PSE series DC Inputs Figure S Remote sense connection 6 Output over voltage protection OVP 6 1 Standard feature In case the regulation circuit fails on the output a secondary regulation circuit limit the output voltage level The circuit also protects the converter output
5. should be approximately 0 5 of nominal output voltage Figure 3 Paralleled system where cables produce voltage drop and a voltage stabilising capacitor in proximity of the load Note that the voltage drop affects the load regulation the voltage at the load see Figure 4 Copyright 2000 2011 Page 8 14 POLYAMP p Uload ua 108 Iout Figure 4 Load regulation with voltage drop Ud between output and load POLYAMP_ _ J ok Figure 5 Output voltage measurement point before the series diode accessible from frontpanel Figure 6 Adjusting output voltage measure at Test or pin amp on the HI5 connector INSTALLATION MANUAL PSE series DC Inputs 3 6 Adjusting output voltage when units are paralleled on the output 1 Connect and start all converters according to Installation on page 6 We recommend using the series diode and separate cables as mentioned above in 3 4 Connecting converters in parallel on the output 2 Measure the voltage at the load Connect voltmeters as showed in Figure 6 If you have only access to one voltmeter you must move it around to make the adjustments 3 To increase the output voltage Increase the output voltage by turning the potentiometer marked V ADJ clockwise on the unit with the lowest output voltage until you reach the desired voltage at the load or until the output voltage does not increase anymore as the unit is In current limit To find the un
6. voltage of the isolation tester from 0 to 2500 Va c The voltage should not be applied for more than one 1 minute or the Y capacitors might be damaged 7 Turn off the isolation tester and discharge the test voltage with a 10 MO resistor between output and case 2011 04 26 Copyright 2000 2011 Page 12 14 POLYAMP p Warning An isolation test shall only be performed by personnel aware of the dangers and hazards of the test 9 3 DC isolation test input to output and input to case Disconnect all cables from the converter Check Figure 13 or Figure 14 to include the alarm relay option The relay outputs are insulated from output input case 3 Connect the output terminals of the converter to case 4 Connect the input terminals together 5 Connect your isolation tester between input and case 6 Raise the voltage of the isolation tester from 0 to 2000 Vd c With option E1 or input code C 110 D raise from 0 to 4000 Vd c Check that the leakage current does not exceed 5uA The voltage should not be applied for more than a few seconds or the Y capacitors might be damaged 7 Turn off the isolation tester and discharge the test voltage with a 10 MO resistor between input and case NO 2011 04 26 Copyright 2000 2011 INSTALLATION MANUAL PSE series DC Inputs Figure 13 Input to output and input to case isolation voltage test Figure 14 Input to output and input to case with relay isol
7. voltage will not be affected The time for the fuse to blow can be calculated from the data sheet of the fuse if you know the short ircuit current trough the fuse 2 Ifthere is a short circuit in one branch and the total current in all branches does exceed 105 of the nominal current of the converter the output voltage will drop until the fuse is blown Depending on the impedance of the short circuit whether it is abrupt or merely an overload and the resistance of the load cables the effects of a short circuit will vary 3 Long cables reduce short circuit currents resulting in longer delay until the fuse is blown and hence an increased voltage dip Light overload does not necessarily result in a blown fuse 4 To reduce the voltage drop at short circuit and if any branch has more than approximately 30 of the total output current of the converter a large external capacitor Is recommended Such a capacitor will supply the peak current needed to blow the fuse see Figure 7 5 To calculate the capacitor needed use the following formula 2011 04 26 Copyright 2000 2011 INSTALLATION MANUAL PSE series DC Inputs C 1 2x IS x At AU 1 2 Safety margin IS Short circuit current through the fuse At Time before the fuse blows see data sheet on the fuse AU Acceptable voltage dip before the fuse blows Example You have a 1A fuse with fast characteristic and the short circuit current is 10A The datasheet
8. 4 Features and options Ifthe converter is to be connected in parallel at the output please consult page 7 9 Ifyou use multiple loads please consult page 10 Ifyou intend to use output undervoltage alarm options please consult page 11 5 Connect the input cables Bundle input cables together separated from the output cables 6 Start the converter by inserting your input slow blow fuse to your DC voltage supply Sparks may occur when the input capacitors are charging Beware of hazardous voltages The output voltage can be adjusted 10 of nominal output voltage with the potentiometer marked V ADJ on the front panel Clockwise turn increases the output voltage The potentiometer has 15 turns If you have connected units in parallel on the output the procedure of adjusting the output voltage is described in Adjusting output voltage when units are paralleled on the output on page 9 2011 04 26 INSTALLATION MANUAL PSE series DC Inputs 3 Parallel connection If a redundant power supply system is requested two or more converters can be connected in parallel To achieve redundancy the number of converters must be dimen sioned to carry the whole load even if one converter is faulty The option C or CR series diode on the output must be provided Connect your load to the output after the series diode cathode Do not forget to fuse the inputs separately to achieve redundancy Another reason for connecting t
9. C isolation test with 4000 Vd c 2500 V x V2 x 1 1 4000 Vd c where 1 1 safety factor 9 1 DC isolation test output to case Disconnect all cables from the converter Check Figure 11 or Figure 12 to include the alarm relay option The relay outputs are insulated from output input case 3 Connect the input terminals of the converter to case 4 Connect the output terminals together NO INSTALLATION MANUAL PSE series DC Inputs 5 Connect your isolation tester between output and case 6 Raise the voltage of the isolation tester from 0 to 2000 Vd c With option E2 0 to 4000 Vd c Check that the leakage current does not exceed 5uA The voltage should not be applied for more than a few seconds or the Y capacitors might be damaged 7 Turn off the isolation tester and discharge the test voltage with a 10 MO resistor between output and case test Figure 12 Output to case with relay alarm isolation voltage test 9 2 AC isolation test output to case option E2 Beware of the rather high capacitive earth currents about 100 mA that will occur during this test 1 Disconnect all cables from the converter 2 Check Figure 11 or Figure 12 to include the alarm relay option The relay outputs are insulated from output input case 3 Connect the input terminals of the converter to case 4 Connect the output terminals together 5 Connect your isolation tester between output and case 6 Raise the
10. ONON CICUS tiea na a Actuals tas E TE E ss una iama O EEEE 10 DS AQOUUPULY OLASES SENSE OPON EE 10 6 Outputover yolas protecuon OV Pora dnd onan ees 11 C A E EE 11 62 GO MNTPSODIODA S Z a kau eee 11 P Q tputlow voltase EE 11 Tt Eoziesienal aldi DE 11 fz Relv outputalarm opion eege e ee 11 8 Higher isolation voltage Option El amp E2 12 9 TSOlANOR VOMASC EE 12 OA WG 1sOlalion test OUl Oe e IR 9 2 AC isolation test output to case optonki 12 93 DC isolation test input to output and input tO case 13 9 4 AC isolation test input to output and input to case Option bit 13 1O Troubk SING OUI u u i aS E maka Suphu aE anu uksa 14 10 1 There s o E Ted EE 14 10 2 The input fuse blows when the input is connected 14 10 3 The converter starts and stops repeatedly 14 OA Ge 14 2011 04 26 Copyright 2000 2011 Page 3 14 POLYAMP 1 Before installation Before installation please read this section and minimum section 2 This installation manual shall also be read together with the datasheet of the product Download the datasheet from www polyamp com and check the File archive where in section Datasheet you will find PSE100 pdf and PSE250 pdf If any problem occurs during installation please check section 11 Trouble shooting
11. Open NO Connect twisted pair 0 25 mm 0 5 mm from centre pin of the removable alarm connector and connector pin marked NO 2 Normally Closed NC Connect twisted pair 0 25 mm 0 5 mm from centre pin of the removable alarm connector and connector pin marked NC Page 11 14 POLYAMP p 8 Higher isolation voltage Option E1 amp E2 El is 2 to 2 5 kVa c 1 minute between Input and output input and case Only applicable for A B 24 48 input codes The emission level is increase to level A E2 is 2 to 2 5 kVa c 1 minute between output and case The emission level is increase to level A 9 Isolation voltage test Each converter has been isolation tested in factory before delivery Please note that consecutive insulation test damage the Y capacitors and affect the EMC performance of the unit We ask you therefore to minimize or completely avoid such test Warning An isolation test shall only be performed by personnel aware of the dangers and hazards of the test The isolation voltage is 2 kVd c between input and output input and case on models with input code A B 24 48 On models with input code C 110 220 and D the insulation voltage is 2 5 kVa c between input and output input and case Option E1 The output to case isolation is 2 kVd c on all models Option El and E2 can increase this isolation If the isolation test equipment cannot supply the AC current you can perform a D
12. accompanying The lightning flash with arrowhead within an equilateral triangle is intended to alert the user to presence of uninsulated dangerous voltage within the products enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons Caution To prevent the risk of electric shock do not open enclosure No serviceable parts inside Refer servicing to qualified service personnel only C We supply a separate declaration of conformity within our shipment that mainly refers to the Low voltage directive and EMC directive 2011 04 26 Copyright 2000 2011 Page 2 14 POLYAMP iann INSTALLATION MANUAL PSE series DC Inputs CONTENTS Bore n tala EE 4 WI Gable and piri HEET ee ee 4 KZ Revers lnp t voltage DRECHEN uu ku a Ee EE E wee 5 ko Anput EE 5 bL ewe Omit ee 5 L Sertes diode on mput option Kl u u u u k u 2 22 am ahua aaa E 6 D gt Hi E e EE 6 a Parallel COmme Ci OM EE d 3 Senes diode on the output option tee deed 7 3 2 Series diode with series resistor option CR 7 3 3 Output under voltage alarm sssr ene reena onae ad aaan a aei eei aa 8 3 4 Connecting systems In N 1 configuration 8 3 5 Connecting converters in parallel on the output 8 3 6 Adjusting output voltage when units are paralleled on the outmut 9 4 Multiple todds at tHe oulfpBut uy ee 10 Sech
13. an electric vehicle an external series diode on the input is recommended Please contact your Polyamp dealer See also section 1 5 series diode on input option K 1 Option Figure I Pin out DIN41612 H15 connector Installation in a 19 sub rack 1 Check the pinout with Figure 1 Connect the protective earth pin 32 This provide safety against electrical shock and is required to achieve EMC performance according to the declaration of conformity 2 Be aware that if the sense option S is provided the sense must be connected to the sensing point and cannot be left open see Section 4 page 10 3 Plug in the unit Read from bullet 3 below Installation with wall mounting panel option N 1 Check the pinout with Figure 1 Connect protective earth to pin 32 This provide safety against electrical shock and is required to achieve EMC performance according to the declaration of conformity Copyright 2000 2011 Page 6 14 POLYAMP p 2 Connect the output Be aware that if the sense option S is provided the sense must be connected to the sensing point and cannot be left open see Section 6 page 10 Bundle the output cables together separate from input 3 The converter output is short circuit proof by a constant current limit which works unlimited in time Therefore there is no need to fuse the load unless you use multiple loads see below The current limit is fixed to 105 of nominal output current
14. ation voltage test 9 4 AC isolation test input to output and input to case Option E1 Beware of the rather high capacitive earth currents about 100 mA that will occur during this test 1 Disconnect all cables from the converter Check Figure I3or Figure 14 to include the alarm relay option The relay outputs are insulated from output input case 3 Connect the output terminals of the converter to case 4 Connect the input terminals together 5 Connect your isolation tester between input and case 6 Raise the voltage of the isolation tester from 0 to 2500Va c The voltage should not be applied for more than one 1 minute or the Y capacitors might be damaged 7 Turn off the isolation tester and discharge the test voltage with a 10 MO resistor between input and case Page 13 14 POLYAMP p 10 Trouble shooting 10 1 There is no output voltage 1 Check that the input fuse is not broken 2 Check that the input voltage polarity is correct 3 Check that the input voltage is within the specified limits 4 The converter may be in current limit due to excessive output current or an external short circuit on the output Measure the output voltage If shows gt 0 5 V the thyristor OVP see section 7 2 might have trigged Disconnect the input by removing the fuse Disconnect the load Connect input fuse again and measure the output voltage If the converter now starts the load was too heavy o
15. converter is used within specification Please describe the conditions when the fault occurred and please return a faulty converter to Your local distributor or SWITCH CRAFT S A Bel Air 63 CH 2300 La Chaux de Fonds Switzerland Tel 41 32 9678800 Fax 41 32 9678809 e mail info switchcraft ch Latest version of this manual www polyamp com Page 14 14
16. erwise a location only accessible for service which meets the demand of EN60950 regarding fire enclosure voltage hazard protection and mechanical strength shall be used With option N wall mounting set you can mount the converter in any direction on a wall or with optional mounting clips on DIN rail TS35 The converter is convection cooled and in order to get sufficient cooling there shall be a free air around the converter If this is not possible we recommend the use of an external fan On 5 V single output voltage the case temperature might increases 20 C above ambient temperature An optional extra cooler called T3 can be provided on 5 V versions to lower temperature or increase the operating temperature range The extra cooler is called T3 Note that the expected life of the converter 1s dependant on converter temperature As a rule of thumb for every 10 C that the temperature is lowered the expected life is approximately doubled It is therefore crucial to cater for good ventilation and if possible to reduce ambient temperature To meet the EMC specifications in the enclosed declaration of conformity use twisted pairs for connecting input output and alarm Shielded cables are not necessary If the converter supplies a DC motor we recommend an external parallel diode at the motor poles to protect against reverse voltages 2011 04 26 INSTALLATION MANUAL PSE series DC Inputs If the converter is mounted in
17. from external voltages OVL trigger voltage is set to 115 to 120 of the nominal voltage The circuit is active as long as the over voltage condition remains 6 2 OVP option A An independent circuit using a SCR thyristor is used as over voltage protection When activated it short circuits the output Reset a trigged OVP by switching off and on the input voltage The circuit protects the converter from high external voltages as well as regulation failures of the unit The OVP trigger voltage is set to 115 to 120 of the nominal voltage OVP is standard on all 5 V master outputs and will trigger at max 6 2 V 7 Output low voltage alarm The alarm circuit monitors the output voltage and trigger when the output voltage become below 10 of nominal output voltage 7 1 Logic signal alarm A standard unit is equipped with a logic signal DCOK or POWER GOOD signal use logic 1 The drive voltage is 6 to 10 V 5 mA logic 1 See also Figure 9 2011 04 26 Copyright 2000 2011 Option 5 Figure 10 UL alarm with internal relay option B Relay symbol shows Alarm state 7 2 Relay output alarm option B The alarm has dry contact output with selectable NO NC function The relay output is insulated from both input and output 2 5 kVa c see Figure 10 The relay is rated 30V 0 5A a c amp d c For higher voltage current relay rating please contact Polyamp The alarm relay can be connected in two ways l Normally
18. it with the lowest output voltage you can measure the voltage difference before the series diode as in Figure 6 Repeat from 1 until you reach the desired output voltage at the load 4 To decrease the output voltage i Decrease the output voltage by turning the potentiometer marked V ADJ counter clockwise on the unit with the highest output voltage until you reach the desired voltage at the load or until the output voltage does not decrease anymore as the other units supply all current To find the unit with the highest output voltage measure the voltage difference before the series diode as in Figure 6 ii Repeat from i until you reach the desired output voltage at the load 5 To achieve good current sharing adjust all converters so that the voltage difference before the series diode is 0 00 V between all units that are connected in parallel and so that the voltage at the load is still the desired 2011 04 26 Copyright 2000 2011 Page 9 14 POLYAMP p 4 Multiple loads at the output If you are using several loads we recommend fusing them separately with fast acting fuses Some considerations regarding short circuits should be taken See below Ame Figure 7 Connecting multiple loads TH PTT P 4 1 Short circuits 1 If there is a short circuit in one branch and the total current in all branches does not exceed 105 of the nominal current of the converter see label on front panel the output
19. ow blow characteristic and high breaking capacity See Table 1 and 2 Input Slow blow fuse voltage PSE100 code Table 1 Fuse dimention PSE100 Input Slow Slow Slow voltage blow fuse blow fuse blow fuse code PSE150 PSE200 PSE250 INSTALLATION MANUAL PSE series DC Inputs 1 4 Inrush current limit The input capacitors are charged through an NTC resistor to reduce the input current during start up On input code D and 220 the NTC resistor is standard As an Option H the NTC resistor can be provided on models with input codes B CT C and 110 All models has an output soft start that do not increase the input current above the unit rated current during start up approx 0 1s Start up behaviour with NTC resistor on DC inputs The input voltage range is changed when an NTC resistor is used see Table 3 The reason is due to sudden load changes from 0 to 100 the input current also changes abruptly This will cause a voltage drop across the NTC resistor until it heats up If the input voltage is only slightly higher than the start voltage of the converter this voltage drop will cause the converter to stop The converter will then start and stop several times until the NTC resistor is heated up We have therefore increased the lowest input voltage on units with a NTC resistor so this behaviour not arises 28 5A 8A 10A PST normal input voltage range Table 2 Recommended input fuses There
20. r there was a short circuit e If there is an external short circuit remove it e Ifthe load is too large decrease the load or consult your Polyamp dealer 5 The unit is broken Contact your Polyamp dealer 10 2 The input fuse blows when the input is connected 1 Check that the input voltage polarity is correct 2 Check that the input fuse is of time delay type and with correct current rating See Table 1 3 The unit is broken Contact your Polyamp dealer 10 3 The converter starts and stops repeatedly All models have an over under voltage protection which shuts down the converter if the input voltage is not within specified limits 1 The cables to the converter input may be under sized causing too high voltage drop in the supply cables 2 Your supply does not have enough current capacity so the input voltage to the converter drops below specified limit 2011 04 26 Copyright 2000 2011 INSTALLATION MANUAL PSE series DC Inputs 10 4 Fault report We do not recommend you to repair a faulty unit All unit opened by customer will not be repaired under warranty Please use our RMA system from our webpage www polyamp com Warranty All Polyamp DC DC converters are warranted against defective material and workmanship This warranty is valid for 24 months from the date of delivery We will repair or replace products which prove to be defective during the warranty period The warranty is valid only if the
21. rte ania a Manual PSE DC doc Installation Manual DC DC converters PSE100 PSE150 PSE200 PSE250 POLYAMp gt POLYAMA_ PSELSO ITWA i past ER i pat ER ga q m wampar h Un PIR PSE100 PSE250 PSE150 or option PSE200 T3 H15 S connector Connector holder for option N Schulz Y Electronic Schulz Electronic GmbH Dr Rudolf Eberle Stra e d D 76534 Baden Baden Fon 49 7223 9636 30 Fax 49 7223 9636 90 vertrieb schulzzet ctronic de www schulz el ctronic de Polyamp AB www polyamp com EU VAT no SE556103276301 Box 925 info polyamp se DUNS no 35 430 3372 191 29 SOLLENTUNA Tel 46 859469300 CAGE S4231 Sweden Tel 46 859469305 NCAGE 54231 POLYAMP rte INSTALLATION MANUAL PSE series DC Inputs Warranty All Polyamp DC DC converters are warranted against defective material and workmanship This warranty is valid for 24 months from the date of delivery We will repair or replace products which prove to be defective during the warranty period The warranty is valid only if the converter is used within specification Manual This manual ts as complete and actual as possible at the time of printing However the information may have been updated since then Polyamp AB reserves the right to make changes m this manual without notice The exclamation point within an equilateral triangle is intended to alert the user to presence of important operating and maintenance instructions 1n the literature
22. time limit on over current condition Temperature range is the rated operation temperature at 100 load condition Input output and case are galvanically separated from each other You can thus choose how you want the system connected This is a Class I insulation system which is dependent of correct earth connection on the input All outputs are insulated from case with minimum 2000 Vd c Section 10 Insulation voltage test describes the insulation rating depending on input voltage See section 9 if higher insulation is required Series number is stamped on the panel under the connector 1 1 Cable and pin dimensioning The PSE series is using a DIN 41621 H15 connector intended for 3HE Euro format mounting Each pin has a continuous current rating of ISA 55 C and 12A 70 C ambient temperature The Uout pins are internally parallel connected and can therefore supply more current or two different loads If the unit is equipped with sense option S this must be connected to one of the loads or a distribution point 2011 04 26 Copyright 2000 2011 Page 4 14 POLYAMP p 1 2 Reverse input voltage protection The input is protected against reverse polarity by a parallel diode on the input on all models The parallel diode is dimensioned to blow a fuse Reverse voltage protection with series diode see section 1 5 Series diode on input option K1 1 3 Input Fuse The input shall be fused with an approved fuse with a sl
23. wo or more converters in parallel is to get more power The option C must be provided and use the output with series diode When the series diode C or CR option is used the Sense option S see section 4 page 10 cannot be used 3 1 Series diode on the output option C A series diode is necessary if the output is connected in parallel with another power supply or if you require redundant operation If a converter breaks down with an internal short circuit on the output and other converters are connected in parallel on the output the broken unit will short circuit the others if the series diode is not used This might cause excessive heat or even fire In the faulty unit The series diode protects the converter output from external voltage sources 3 2 Series diode with series resistor option CR This option is an extension of 3 Series diode When several PSE units are connected in parallel with so called hot plug in in 19 sub rack a built in series resistor and series diode is provided that will automatically balance the current between units The series resistor will provide the Ud function described in section 3 6 and Figure 4 Thus no special cable arrangments are needed with this CR option Copyright 2000 2011 Page 7 14 POLYAMP p 3 3 Output under voltage alarm If one DC DC converter fails in a redundant power system an alarm signal should be detected The PSE has a logic signal alarm An optional relay dry

Installation Manual DC/DC converters PSE100, PSE150, PSE200

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