Instruction/ maintenance manual of the product 750W HALF RACK TDK
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TECHNICAL MANUAL FOR GENES YS TM 750W HALF RACK Programm able DC Power Su pplies Document: 83- 507-5002 Rev B TDK-Lambda A mericas Inc . 405 Ess ex Road, Neptune, NJ 07753 Tel: (732) 922-9300 Fax: (732) 922-9334 Web: www .
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83-507-5002 Rev. B GENESYS™ M anual Supplement FOR UNITS EQUIPPED W ITH “IEMD” O PTION. ALSO REFER TO MANUAL 83-030-200 IEMD..
83-507-5002 Rev. B TA BLE OF CONTENTS W ARRANTY……………………………… …………………………………… ………………………. Pg. 1 SAFETY INSTRUCT IONS……………… ………………………………… ………………………….
83-507-5002 Rev. B TA BLE OF CONTENTS 3.9 CONNECT ING T HE LOAD……………………………… ………………………………… …….. Pg. 18 3.9.1 Load W iring…………… ………………………………… ………………………………….
83-507-5002 Rev. B TA BLE OF CONTENTS 5.15 PARALLEL OPERATION…………………… …………………………………… .………….…. Pg. 41 5.15.1 Basic parallel oper a tion…………………………………………………………………….
83-507-5002 Rev. B TA BLE OF CONTENTS 7.10.4 Addressed com m ands with response………………… ………………………………… Pg. 60 7.10.5 Addressed com m ands without response…………………… ………………………….. Pg.
83-000-016 Rev. F WARRAN TY This T DK-Lambda Am ericas Inc. product is warra nted aga inst def ects in m aterials and workm anship for a period of five years f rom date of shipm ent. Duri ng the warrant y period, TDK- Lam bda Am ericas Inc. will, at it’s op tion, eith er repair or r eplace products which pro ve to be def ective.
83-507-5002 Rev. B 2 SA FETY I NSTRUCTIONS CA UTIO N The following saf ety precaut ions must be observed during all phases of operat ion, service and repair of this equipment.
83 - 507 - 5002 Rev. B 3 SA FETY INSTRUCT IONS ENVIRONMENTA L CONDITIONS The Genesys TM power supply series safety approval applies to the f ollowing operating cond i tions: *Indoor use *Ambien t temp.
83-507-5002 Rev. B 4 SICHERHEITS-INSTA LLA TIONS A NWEISUNGEN Vorsicht Vor Anschluss an das Netz ist die Aufst ellanleitung wie nachstehend beschrieben zu beachten. Die nachstehenden Sicherheitsanweisugen mussen während aller Phasen des Betriebes, des Services und der Reparatur dieser Ausrustung beachtet werden.
83-507-5002 Rev. B 5 A nderungen and Bautei leersatz Ersatzteilaustausch – und Anderungen durfen nur von autorisiertem TDK-Lambda Amer icas Inc. SERVICE-PERSONEN durchgefuhrt werden. Fur Reparaturen oder Anderungen ist das Gerat zur T DK-Lambda Americas I nc.
83-5 07-5 002 Rev. B 6 CHA PTER 1 GENERA L INFORM A TI ON 1.1 US ER MA NUA L CONTE NT This User’s Manual contains t he operating instr uctions, installation instructions and specifications of t he Genesys TM GENH 750W power supply series.
83-5 07-5 002 Rev. B 7 ∗ Parallel operation (Master/Slave) with Active current sharing. ∗ Remote sensing to com pensate f or voltage drop of power leads. ∗ Ex ternal Analog Prog ramming and Monitoring standard ( 0-5V or 0-10V, user selectable). ∗ Cooli ng f an speed contr ol for low noise and extended fan life.
83-5 07-5 002 Rev. B 8 1.2.9 Cooling and mechanical construction The Genesys TM ser ies is cooled by inter nal f ans. At the installation, care must be t aken to allow free airf low into the power supply via the front panel and out of the power supply via t he rear panel.
83-5 07-5 002 Rev. B 9 CHA PTER 2 SPECIFICA TIONS 2.1 OUTPUT RA TING MODEL GEN 6-100 8-90 12.5-60 20-38 30-25 40-19 – 60-12.5 80-9.5 100-7.5 150-5 300-2.5 600-1.3 1.Rated output voltage (*1 ) V 6 8 12.5 20 30 40 – 60 80 100 150 300 600 2.Rated output current 750W (*2) A 100 90 60 38 25 19 – 12.
83-5 07-5 002 Rev. B 10 1. Vout programming ac curacy – 2. Iout programming accuracy (*13) – 3. Vout programming resoluti on. – 4. Iout programming resolution – 5. Vout readback ac curacy – 6. Iout readback accuracy (*13) – 7. Vout readback resol ution – 8.
83-5 07-5 002 Rev. B 11 NOTES: *1: Minimum voltage is guar anteed to maximum 0.2% of the r ated output voltage. *2: Minimum current is guaranteed t o maximum 0.4% of the rated out put current . *3: For cases where conf ormance to various safety st andards (UL, IEC etc.
83 - 507 - 5002 Re v. B 12 2.13 GENES YS TM GENH 750W POWER SUPPLI ES OUTLINE DRA WINGS.
83-5 07-5 002 Rev. B 13 CHA PTE R 3 IN STA LL A TION 3.1 GE NERA L This Chapter cont ains instructions for initial inspection, pr eparation f or use and r epackaging f or shipment. Connection to PC, setting the communication port and linking Genesys TM power sup- plies are described in Chapter 7.
83-5 07-5 002 Rev. B 14 3.4 RACK MOUNTING To inst all a G ENH750W one unit or two units side-by-side in a standard 19” Rack in 1U (1.75”) height, use option kit P/N: GENH/RM The Rack Mount k it allows the units to be zero stack ed for maximum system f lexibi lity and power density wi thout increasing the 1U height of the units.
83-5 07-5 002 Rev. B 15 3.4.3 GENH/RM Rack Mounting outli ne draw ings: 3.5 LO CA TIO N, MOUNTING AND COOLING This power supply is f an cooled. The air intake is at t he front panel and the exhaust is at t he rear panel. Upon inst allation allow cooling air t o each the f ront panel ventilation inlets.
83-5 07-5 002 Rev. B 16 1 Re mot e (+) se nse 2 Lo cal (+) se nse 3 No t con nec ted 4 Lo cal (-) s ense 5 Re mot e (- ) sen se 3.7.1 AC Input Connector An IEC connect or is provided on the rear panel f or connecting the unit to the AC power source with an AC cord.
83-5 07-5 002 Rev. B 17 3.8.3 Constant Voltage Check 1. Turn on t he output by pressing the O UT pushbutton so the OUT LED illuminates. 2. Observe the power supply VOLT display and rotate the Voltage encoder . Ensure that the Output Voltag e varies while the VOLT encoder is r otated.
83-5 07-5 002 Rev. B 18 3.8.7 Foldback Check Refer t o Section 5.5 f or explanation of the FOLD f unction prior to perf orming the procedure below. 1. Ensure that t he Output Voltage is set to approx. 10% of t he unit rating . 2. Adjust the CURRENT encoder to set the Output Current set ting to approx.
83-5 07-5 002 Rev. B 19 2. W ire size should be selected to enable voltage drop per lead to be less t han 1.0V at t he rated curr ent. Although units will compensate for up to 5V in each load wire, it.
83-5 07-5 002 Rev. B 20 3.9.4 Noise and Impedance Effect s To minimize the noise pick up or radiation, the load wires and remote sense wires should be twisted pairs to the shor test possible length. Shielding of sense leads may be necessary in hig h noise environments.
83-5 07-5 002 Rev. B 21 Fig. 3-6: bus-b ars s hield mo unting 80V to 600V Models WA RNING Hazardous voltages exist at the output s and the load connections. To protect per sonnel against accidental contact with hazardous voltages, ensure that t he load and its connections have no accessible liv e parts.
83-5 07-5 002 Rev. B 22 The 80V to 600V models have a f our ter minal wire clamp output connector. The t wo left ter minals are the positive outputs and the two right term inals are the negative outputs. The connector re- quirements are as f ollows: 1.
83-5 07-5 002 Rev. B 23 - - R e m . s e n s e Lo cal s e ns e Lo cal sen se Rem . s en se + + Lo ad lin es , tw iste d pa ir , s hor tes t l ength po ssib le. +V -V Load + Powe r Sup ply 3.9.7 Connecting single loads, local sensing (default). Fig.3-10 shows r ecommended load and sensing connections f or a single load.
83-5 07-5 002 Rev. B 24 - - R e m . s e n s e Lo cal s en se Lo cal sen se Rem . s en se + + Lo ad line s, t wist ed p air , sh orte st le ngth po ssi ble. +V -V Lo ad# 1 + Lo ad# 3 + Lo ad# 2 + Powe r Sup ply Fig.3-12: Multiple load s connection, radial distr ibution, local sense 3.
83-5 07-5 002 Rev. B 25 WA RNING O UTPUT TERMINAL GROUNDING There is a potential shock hazard at the RS232/RS485 and the I EEE ports when using power supplies with rated or combined voltage greater t han 400V with t he Positive Output of the power supplies grounded.
83-5 07-5 002 Rev. B 26 3.10.3 Remote sensing Use remote sense where the load regulation at the load end is critical. In remote sense, t he power supply wil l compensat e f or voltage drop on the load wires. Refer to the power supply specifications f or the maximum voltage dr op on load wi res.
83-5 07-5 002 Rev. B 27 CHA PTER 4 FRONT A ND REA R PA NEL CONTROLS A ND CONNECTORS 4.1 INTRODUCTI ON The Genesys TM Power Supply ser ies has a full set of controls, indicators and connector s that al- low the user to easily setup and operate the unit.
83-5 07-5 002 Rev. B 28 Table 4-1: Front Panel Controls and I ndicators Number Control/Indicator Description Section 4 CURRENT display 4 digit, 7 segment LED display. Normally displa ys the O utput Current. W hen t he PREV button is pressed, the display indi- cates the pr ogramm ed setting of Output Curr ent.
83-5 07-5 002 Rev. B 29 Table 4-1: Front Panel Controls and I ndicators (continued) Number Control/Indicator Description Section 15 PREV indicator Green LED, light s when PREV button is pressed 16 FINE button Voltage and Current Fine/Coarse adjustment contr ol.
83-5 07-5 002 Rev. B 30 Table 4-2: Rear panel Connections and Controls (cont inued) Number Item Description Section 4 Remote O ut connector RJ-45 type connector, used for daisy-chaining power supplies to form a serial comm unication bus. 7.3 7.5 5 J1 Analog Remote connector Connector for remot e analog interf ace.
83-5 07- 5002 Rev . B 31 T able 4-3: SW 1 Positions Functions Position Function DOWN ( Factory default) UP SW 1-1 Output Voltage rem ote analog programm ing Output Vol tage program m ed by Front Panel.
83-5 07-5 002 Rev. B 32 CA UTION Terminals 12, 22 and 23 of J1 are connected inter nally to the negative sense (-S) potential of the power supply. Do not att empt t o bias any of these t erminals relative to the negative sense.
83-5 07-5 002 Rev. B 33 1 4 1 5 1 6 1 7 1 8 1 9 2 0 2 1 2 2 2 3 2 4 2 5 1 2 3 4 5 6 7 8 1 0 11 1 2 1 3 9 S am e g roun d a s P /S n eg at i ve se n s e (-S ) Iso l at ed f ro m P S o u tpu ts , sa m e gro u n d a s R S 23 2/ R S4 85 IMON IPGM_RTN VPGM_RTN LOC/REM SIGNAL IF_COM IF_COM ENA_IN VMON COM CV/CC IPGM VPGM LOC/ REM P ENA_OUT SO PS_OK Fig.
83-5 07-5 002 Rev. B 34 CHA PTER 5 LOCA L OPERA TION 5.1 INTRO DUCTION This Chapter describes the oper ating modes t hat are not involved in programm ing and monitor- ing the power supply via its serial c ommunication por t (RS232/RS485) or by rem ote analog sig - nals.
83-5 07-5 002 Rev. B 35 -Enabled output, power supply in Constant Voltage mode: Press the PREV button and then rotate the CURRENT encoder k nob. The CURRENT meter will show the pro- gramm ed Output Current f or 5 s econds aft er the adj ustment has been completed, and then will return to show the actual load cur rent.
83-5 07-5 002 Rev. B 36 5.4 UNDE R VOLTAGE LIMIT (UVL) The UVL prevents adjust ment of the Output Voltag e below a certain limit. T he combination of UVL and OVP f unctions, allow the user to cr eate a prot ection window for sensitive load circuitry. 5.
83-5 07-5 002 Rev. B 37 CA UTION Do not connect the CV/CC signal to a voltage source higher than 30VDC. Alway s connect the CV/CC signal to voltage source with a series resistor to lim it the sink current to less than 10m A. applying AC power; even if SO is at an Of f level).
83-5 07-5 002 Rev. B 38 5.10 PS_OK S IGNA L The PS_OK sig nal indicates the f ault condition of the power supply. PS_OK is a TT L signal out- put at J1- 16, ref erenced to IF_COM at J1-2, 3 (Isolated Int erface Common).
83-5 07-5 002 Rev. B 39 W A RNING W hen power supplies ar e connected in series, and the load or one of the out put t erminals is gr ounded, no point m ay be at a gr eater pot ential of +/ -60VDC from ground f or m odels up to 60VDC Rated O utput and + /-600VDC f rom gr ound f or models >60VDC Rated Output.
83-5 07-5 002 Rev. B 40 Fig .5-3: S er ies c onnec tion for posit ive/ne ga tive o utpu t vo ltages +S + - -S -L S +LS PO WER SU PPL Y +S + + - - -S -L S +LS PO WER SU PPL Y (*) (*) (*) D io des are use r su ppli ed. Remote programming i n series operation f or increased output voltage: 1.
83-5 07-5 002 Rev. B 41 Remote programming i n series operation f or positive and negative output voltage 1. Progr amming by external voltage: The analog pr ogramm ing circuits of this power supply are ref erenced to the negative output po- tential.
83-5 07-5 002 Rev. B 42 During operation, the Slave units operate as a controlled current source f ollowi ng the Master Output Curr ent. It is recomm ended that t he power system be designed so that each unit supplies up to 95% of its current r ating because of t he imbalance which may be caused by cabling and connection voltage drop.
83-5 07-5 002 Rev. B 43 Fig .5-4: P aralle l c onne ction w ith loca l sen sing MASTER POWER SUPPL Y SLA VE#1 POWER SUPPL Y J1 -25 J1 -10 P IPGM + V - V + V - V LOA D As short as possible T w isted pair +S -S J1 -8 J1 -12 T o J1-10 SLA VE#2 POWER SUPPL Y -S -LS +LS +S +LS -LS 3.
83-5 07-5 002 Rev. B 44 NOTE W ith local sensing it is important to m inimize the wire length and resistance. Also the positive and negative wi re resistance s hould be close as possible to each other to achieve current balance be- tween power supplie s Fig .
83-5 07-5 002 Rev. B 45 5.17.1 Unlocked front panel In this mode, t he f ront panel controls are Enabled t o progr am and m onitor the power supply pa- rameters. 5.17.2 Locked front panel In this mode the f ollowi ng f ront panel cont rols are Disabled: -VOLT AGE and CURRENT encoders.
83-5 07-5 002 Rev. B 46 CA UTION COM (J1-12), VPGM_RTN (J1-22) AND IPGM_RTN (J1-23) t erminals of J1 connect inter nally to t he -Sense potential (-S). Do not connect these terminals to any potential other t han -Sense (-S) , as it m ay damage the power supply.
83-5 07-5 002 Rev. B 47 CA UT ION To maintain the power supply isolation and to pr event ground loops, use an isolated programm ing source when operating the power supply via rem ote analog progr amming at the J1 connector.
83-5 07-5 002 Rev. B 48 6.5 RE SISITIVE PROGRAMMING OF OUTPUT VOLTAGE A ND CURRENT LIMIT For resistive progr amming, internal current sources, f or O utput Voltage and/or Out put Current control, supply 1mA current throug h external progr amming r esistors connected between J1-9 & 22 and J1-10 & 23.
83-5 07-5 002 Rev. B 49 6.6 RE MOTE MONITORING OF OUTPUT V OLTA GE A ND CURRENT The J1 connect or, located on the rear panel pr ovides analog signals f or monitoring the Out put Voltage and Out put Current. Selection of the voltage rang e between 0-5V or 0- 10V is made by setup switch SW 1-4.
83-5 07-5 002 Rev. B 50 CHA PTER 7 RS232 & RS485 REM OTE CONTROL 7.1 INTRO DUCTION This Chapter describes the operation of the Genesys TM 3300W power supplies via t he serial communication port. Details of t he initial set-up, operation via RS232 or RS485, the com mand set and the communication protocol ar e described in this Chapter.
83-5 07-5 002 Rev. B 51 NOT E Tx and Rx are used f or RS232 communication. Txd +/- and Rxd +/ - are used for RS485 communication. Ref er to RS - 232 and RS - 485 cabling and connection d e t ails. 2. There are two Remote modes: 1. Remote: In this mode, return to local can be made by the f ront panel REM/LOC or via serial port com mand RM T 0.
83-5 07-5 002 Rev. B 52 7.4 MD MODE OPTION (Fa ctory Installed) 7.4.1 MD Mode Description The GEN supply is capable of operating in a multi drop environment - more than 1 supply con- ducting serial com munications on a single ser ial bus. A maximum of 31 G EN supplies can oper- ate in this single bus.
83-5 07-5 002 Rev. B 53 7.5 CONNE CTING POW ER SUPPLI ES TO RS2 32 OR RS485 BUS 7.5.1 Single pow er supply 1. Select the desired interface R S232 or RS485 using rear panel setup switch SW1-6 (Section 4-4). -RS232: DOW N position -RS485: UP position 2.
83-5 07-5 002 Rev. B 54 NOTE The addr ess (ADR n) comm and must retur n an “O K” response bef ore any other commands are accepted. 7.5.2 Multi pow er supply conne ction to RS232 or RS485 bus Up to 31 units can be connected (daisy chained) to the RS232 or RS485 bus.
83-5 07-5 002 Rev. B 55 7.6.6 A cknow ledge The power supply acknowledges received commands by retur ning an “O K” messag e. If an err or is detected the power supply w ill return an error message. The r ules of c hecksum also apply to the acknowledge.
83-5 07-5 002 Rev. B 56 7.8.3 Initiali zation Control Commands # Command Description 1 ADR n ADR is followed by address, which can be 0 to 30 and is used to access the power supply. 2 CLS Clear status. Sets FEVE and SEVE registers to zero (ref er t o Section 7-11).
83-5 07-5 002 Rev. B 57 6 MC? (See Note 2) Reads t he actual Out put Current. Returns a 5 digit str ing. Example: 200A supply sends 000.50, 110.12, 200.00, etc… 7 DVC? Display Voltage and Current data. Data will be returned as a string of ASCII characters.
83-5 07-5 002 Rev. B 58 25 RCL Recalls last setting s. Settings are f rom t he last power-down or from t he last “SAV” c ommand. 26 M O DE? Ret urns the power supply operation mode. W hen the power supply is On (OUT 1) it will return “CV” or “CC”.
83-5 07-5 002 Rev. B 59 7.10 S INGLE BYTE COMMANDS 7.10.1 General Single byte commands are commands in which all the necessary data f or t he supply to act upon is contained in a single byte. Sing le byte commands will be executed immediately by the supply.
83-5 07-5 002 Rev. B 60 7.10.3 Gl obal commands w ith response 7.10.3.1 Disconn ect from comm unications Command the supply to end all data transmissions t o the HOST PC/IEEE Board and cease its role as the act ive addressed supply.
83-5 07-5 002 Rev. B 61 7.10.4.4 T est if M D Mode is Instal led Send AA Hex followed by the address of t he supply in binary. If not installed, the supply will re- turn a ‘1’. I f installed, the supply will return a ‘0’. 7.10.5 A ddressed commands w ithout response 7.
83-5 07-5 002 Rev. B 62 Print Power On Time Byte 1 1010 0110 Byte 2 xxx x xxxx Power On time in min- utes Read the time the supply is active under AC Power. xxxx xxx x is the address of the supply in binary. Returns a 32 Bit integer as 8 Hex bytes. A ‘$’ sign is appended to the data f ollowed by a 2 byte check-sum .
83-5 07-5 002 Rev. B 63 Table 7-6: OVP progr amming r ange Table 7-7: UVL prog ramming range Model Rated Outp ut Volta ge (V) Minimum (V) Max imum (V) Model Rated Outp ut Volta ge (V) Minimum (V) Max imum (V) 6 0.5 7.50 6 0 5.70 8 0.5 10.0 8 0 7.60 12.
83-5 07-5 002 Rev. B 64 SR Q Me ssage s Res ponse me ssage s Com mand E rror (” Cnn ”) Exe cu tion Err or (”E nn” ) Qu ery R espon se (”me ssage”) Com mand R espon se (”OK ”) CV CC NFL.
83-5 07-5 002 Rev. B 65 7.11.2 Conditional Regist ers (continued) Table 7-8: Fault Condition Register BIT Fault name Fault symbol Bit Set condition Bit Reset condition 0 (LSB) Spare bit SPARE Fixed to zero Fixed to zero 1 AC Fail AC AC fail has occurr ed.
83-5 07-5 002 Rev. B 66 The SRQ message is: “Inn” terminated by CR, where the nn is the power supply address. The SRQ will be generated either in Local or Remote mode. Refer t o Tables 7-10 to 7-13 f or det ails of t he Enable and Event registers.
83-5 07-5 002 Rev. B 67 3. Status Enable Register The Stat us Enable Register is set by the user to Enable SRQs for changes in power supply status. Table 7-12: St atus Enable Register BIT Status name .
83-5 07-5 002 Rev. B 68 7.12 SERIAL COMMUNICA TION TEST SET-UP Use the f ollowi ng instruct ions as basic set-up to test the serial comm unication operation. 1.Equipment : PC with W indow s Hyper Terminal, sof tware installed, Genesys TM Power supply, RS232 cable.
83-5 07-5 002 Rev. B 69 CHA PTER 8 ISOLA TED A NA LOG PROGRA M M ING OPTIO N 8.1 INTRODUCTI ON Isolated Analog Pr ogramm ing is an internal Option Card f or analog progr amming of the Gene- sys TM power supply ser ies. T he option is f actor y installed and cannot be obtained with a GPIB (IEEE-488) I nterf ace.
83-5 07-5 002 Rev. B 70 CA UT ION W hen the Isolated Analog Option is installed, do not apply any signals to the non-isolated VPGM and IPGM (J1-9 and J1-10) pins. All other J1 f eatures may be used normally. Refer to Section 4. 5 for a description of J1 f eatures.
83 - 507 - 5002 Re v. B 71 CA UTION To prevent damage to the unit, do not pr ogram the output voltage and current to higher t han the power suppl y rating. NOTE J1 - 8 and J1 - 12 must be shorted toget her with a w ire jumper. NOTE J1 - 8 and J1 - 12 must be shorted toget her with a w ire jumper.
83-5 07-5 002 Rev. B 72 CHA PTER 9 M A INTENA NCE 9.1 INTRODUCTI ON This Chapter pr ovides information about maintenance, calibration and t roubleshooting. 9.2 UNITS UNDER WARRA NTY Units requiring repair dur ing the warranty period should be returned to a TDK-Lam bda Americas Inc.
83-5 07-5 002 Rev. B 73 SYMP TOM CHECK ACTION REF Output is pr esent momentarily but shuts off quickly.The display indi cates “OUP”. Is the power supply configur ed to Remote sense? Check if the positive or negative load wire is loose. 3.9.6 3.9.8 Output Voltag e will not adjust.
83-5 07-5 002 Rev. B 74 9.7 FUS E RA TING There are no user replaceable f uses in the power supply. Inter nal fuses are sized for fault pr otec- tion and if a fuse was opened, it would indicate that service is required. Fuse replacement should be made by qualif ied technical personnel.
An important point after buying a device TDK 750W HALF RACK (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought TDK 750W HALF RACK yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data TDK 750W HALF RACK - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, TDK 750W HALF RACK you will learn all the available features of the product, as well as information on its operation. The information that you get TDK 750W HALF RACK will certainly help you make a decision on the purchase.
If you already are a holder of TDK 750W HALF RACK, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime TDK 750W HALF RACK.
However, one of the most important roles played by the user manual is to help in solving problems with TDK 750W HALF RACK. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device TDK 750W HALF RACK along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
