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CD5.121

CD-Series

DC/DC Converter 12V, 8A

DC/DC

CONVERTER

 24V DC-Input

 Isolated 12Vdc Output

 Efficiency up to 88.2%

 Width only 32mm

 20% Output Power Reserves

 Full Power Between -25°C and +60°C

 Soft-start Function Included

 Minimal Inrush Current Surge

 Reverse Input Polarity Protection

 3 Year Warranty

1/22

GENERAL DESCRIPTION

The Dimension CD-Series offer DIN-rail DC/DC converters

in the 92-120W output power range in a very compact

housing. These DC/DC converters are allowed to run

with a battery or similar sources.

The CD5.121 converts a 24V voltage to a 12V voltage.

The CD5.121 includes all the essential basic functions

and has a power reserve of 20% included. This extra

power can be used continuously up to +45°C.

The output is electrically isolated from the input in a

safe way. The input is protected against reversed

voltages and contains a soft start function.

CD5.241 CD5.242

CD5.243

CD5.241-S1

24V->24V,

Spring-clamp-terminals,

ut-low, DC-OK si

nals

CD-Series

Summary of content (22 pages)

PAGE 1
CD5.121 DC/DC Converter 12V, 8A CD-Series DC/DC CONVERTER 24V DC-Input Isolated 12Vdc Output Efficiency up to 88.2% Width only 32mm 20% Output Power Reserves Full Power Between -25°C and +60°C Soft-start Function Included Minimal Inrush Current Surge Reverse Input Polarity Protection 3 Year Warranty GENERAL DESCRIPTION SHORT-FORM DATA The Dimension CD-Series offer DIN-rail DC/DC converters in the 92-120W output power range in a very compact housing.
PAGE 2
CD5.121 DC/DC Converter 12V, 8A CD-Series INDEX Page 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. Intended Use .......................................................3 Installation Requirements...................................3 Input Voltage ......................................................4 Soft-start and Input Inrush Current Surge .........5 Output .................................................................6 Hold-up Time.......................................................
PAGE 3
CD5.121 DC/DC Converter 12V, 8A CD-Series 1. INTENDED USE This device is designed for installation in an enclosure and is intended for the general use such as in industrial control, office, communication, and instrumentation equipment. Do not use this DC/DC converter in equipment where malfunction may cause severe personal injury or threaten human life. 2. INSTALLATION REQUIREMENTS This device may only be installed and put into operation by qualified personnel.
PAGE 4
CD5.121 DC/DC Converter 12V, 8A CD-Series 3. INPUT VOLTAGE Input voltage Input voltage range nom. DC 24V 18.0-32.4Vdc 14.4-18.0Vdc 36.0Vdc max. Allowed voltage between input and earth Allowed input ripple voltage Turn-on voltage Shut-down voltage Input current Start-up delay Rise time Turn-on overshoot Input capacitance max. max. 60Vdc or 42.2Vac 5Vpp typ. typ. typ. typ. typ. typ. typ. max. typ. 17.5Vdc 14.0Vdc 35.0Vdc 4.
PAGE 5
CD5.121 DC/DC Converter 12V, 8A CD-Series 4. SOFT-START AND INPUT INRUSH CURRENT SURGE Inrush current limitation An active inrush limitation circuit (inrush limiting resistor which is bypassed by a relay contact) limits the input inrush current after turn-on of the input voltage. The charging current into EMI suppression capacitors is disregarded in the first microseconds after switch-on. Inrush current max. typ. typ. Inrush energy 1.6Apeak 1.
PAGE 6
CD5.121 DC/DC Converter 12V, 8A CD-Series 5. OUTPUT Output voltage Adjustment range nom. min. max. Factory setting Line regulation Load regulation Ripple and noise voltage Output current max. max. max. nom. nom. nom. nom. nom. nom. min. max. typ. Output power Short-circuit current Output capacitance 12V 12-15V 16.1V 12.0V 25mV 120mV 75mVpp 9.6A 8A 7.7A 6.4A 115W 96W 14A 18A 6 500μF Fig. 5-1 Output voltage vs. output current at 24Vdc input voltage, typ.
PAGE 7
CD5.121 DC/DC Converter 12V, 8A CD-Series 6. HOLD-UP TIME The input side of the DC/DC converter is equipped with a bulk capacitor which keeps the output voltage alive for a certain period of time when the input voltage dips or is removed. The bulk capacitor can be discharged by loading the DC/DC converter on the output side or through a load which is parallel to the input. There is no protection in the DC/DC converter which prevents current from flowing back to the input terminals.
PAGE 8
CD5.121 DC/DC Converter 12V, 8A CD-Series 7. EFFICIENCY AND POWER LOSSES Efficiency Power losses Fig. 7-1 Input 24Vdc 88.2% 0.6W 6.4W 12.8W 16.8W typ. typ. typ. typ. typ. Efficiency vs. output current at 12V output and 24Vdc input voltage, typ. Efficiency at 12V, 8A at no output load at 12V, 4A at 12V, 8A at 12V, 9.6A Fig. 7-2 Losses vs. output current at 12V output and 24Vdc input voltage, typ. Power Losses 90% 18W 89 15 88 12 87 9 86 6 85 3 Output Current 84 1 Fig.
PAGE 9
CD5.121 DC/DC Converter 12V, 8A CD-Series 8. FUNCTIONAL DIAGRAM Fig. 8-1 Functional diagram Output Voltage Regulator + - Input Fuse & Input Filter Chassis Ground Reverse Polarity Protection & Inrush Limiter OverTemperature Protection Power Converter VOUT Output Filter Output OverVoltage Protection + + DC ok 9. FRONT SIDE AND USER ELEMENTS Fig.
PAGE 10
CD5.121 DC/DC Converter 12V, 8A CD-Series 10. TERMINALS AND WIRING Type Solid wire Stranded wire American Wire Gauge Wire stripping length Screwdriver Recommended tightening torque Input screw terminals max. 6mm2 max. 4mm2 20-10 AWG 7mm / 0.275inch 3.5mm slotted or Pozidrive No 2 1Nm, 9lb.in Output screw terminals max. 6mm2 max. 4mm2 20-10 AWG 7mm / 0.275inch 3.5mm slotted or Pozidrive No 2 1Nm, 9lb.
PAGE 11
CD5.121 DC/DC Converter 12V, 8A CD-Series 12. EMC The DC/DC converter is suitable for applications in industrial environment as well as in residential, commercial and light industry environment without any restrictions. EMC Immunity Electrostatic discharge Electromagnetic RF field Fast transients (Burst) Surge voltage on input Surge voltage on output Conducted disturbance Generic standards: EN 61000-6-1 and EN 61000-6-2 EN 61000-4-2 Contact discharge Air discharge EN 61000-4-3 80MHz-2.
PAGE 12
CD5.121 DC/DC Converter 12V, 8A CD-Series 13. ENVIRONMENT Operational temperature *) Storage temperature Output de-rating Humidity **) Vibration sinusoidal ***) Shock ***) Altitude -25°C to +70°C (-13°F to 158°F) -40 to +85°C (-40°F to 185°F) 1.25W/°C 2.5W/°C 5 to 95% r.H. 2-17.8Hz: ±1.6mm; 17.8-500Hz: 2g 2 hours / axis 30g 6ms, 20g 11ms 3 bumps / direction, 18 bumps in total 0 to 6000m (0 to 20 000ft) reduce output power according Fig.
PAGE 13
CD5.121 CD-Series DC/DC Converter 12V, 8A 14. PROTECTION FEATURES Output protection Output over-voltage protection Electronically protected against overload, no-load and short-circuits *) typ. 16.5Vdc in case of an internal power supply defect, a redundant max. 16.8Vdc circuit limits the maximum output voltage. The output shuts down and automatically attempts to restart.
PAGE 14
CD5.121 DC/DC Converter 12V, 8A CD-Series 16. DIELECTRIC STRENGTH The output voltage is floating and has no ohmic connection to the ground. Type and factory tests are conducted by the manufacturer. Field tests may be conducted in the field using the appropriate test equipment which applies the voltage with a slow ramp (2s up and 2s down). Connect all phaseterminals together as well as all output poles before conducting the test.
PAGE 15
CD5.121 DC/DC Converter 12V, 8A CD-Series 17. APPROVALS EC Declaration of Conformity The CE mark indicates conformance with the - EMC directive and the - ATEX directive. CB Scheme, Information Technology Equipment IEC 60950-1 2nd Edition UL 508 IND. CONT. EQ. UL 60950-1 EN 60079-0, EN 60079-15 ATEX II 3G Ex nA nC II T4 Gc IEC 60079-0, IEC 60079-15 ANSI / ISA 12.12.01-2007 Class I Div 2 Marine EAC TR Registration IECEx LISTED for use as Industrial Control Equipment; U.S.A. (UL 508) and Canada (C22.
PAGE 16
CD5.121 CD-Series DC/DC Converter 12V, 8A 19. PHYSICAL DIMENSIONS AND WEIGHT Weight DIN-Rail Installation Clearances 425g / 0.94lb Use 35mm DIN-rails according to EN 60715 or EN 50022 with a height of 7.5 or 15mm. The DIN-rail height must be added to the unit depth (102mm) to calculate the total required installation depth. See chapter 2 Fig. 19-1 Front view Fig. 19-2 Side view Mar. 2016 / Rev. 1.5 DS-CD5.
PAGE 17
CD5.121 DC/DC Converter 12V, 8A CD-Series 20. ACCESSORIES ZM1.WALL Wall mounting bracket This bracket is used to mount specific Dimension units onto a flat surface without utilizing a DIN-Rail. The two aluminum brackets and the black plastic slider of the unit have to be removed, so that the two steel brackets can be mounted. Fig. 20-1 ZM1.WALL Wall mounting bracket *) Fig. 20-2 Assembled wall mounting bracket *) Picture of the DC/DC converter is for representation only ZM11.
PAGE 18
CD5.121 DC/DC Converter 12V, 8A CD-Series 21. APPLICATION NOTES 21.1. PEAK CURRENT CAPABILITY Solenoids, contactors and pneumatic modules often have a steady state coil and a pick-up coil. The inrush current demand of the pick-up coil is several times higher than the steady-state current and usually exceeds the nominal output current (including the PowerBoost) The same situation applies, when starting a capacitive load. Branch circuits are often protected with circuit breakers or fuses.
PAGE 19
CD5.121 DC/DC Converter 12V, 8A CD-Series 21.4. CHARGING OF BATTERIES The DC/DC converter can be used to charge lead-acid or maintenance free 12V VRLA batteries. Instructions for charging batteries: a) Ensure that the ambient temperature of the DC/DC converter is below 45°C b) Do not use DC/DC converters in mounting orientations other than the standard mounting orientation (input terminals on the bottom and output terminals on top of the unit).
PAGE 20
CD5.121 DC/DC Converter 12V, 8A CD-Series 21.7. PARALLEL USE TO INCREASE OUTPUT POWER Unit A The DC/DC-converter can be paralleled to increase the output power. There are no feature included which balances the load current between the DC/DCconverters. Therefore some restrictions and limitations apply. The DC/DCconverter with the higher adjusted output voltage draws current until it goes into current limitation.
PAGE 21
CD5.121 DC/DC Converter 12V, 8A CD-Series 21.9. DAISY CHAINING OF OUTPUTS Daisy chaining (jumping from one DC/DC-converter output to the next) is allowed as long as the average output current through one terminal pin does not exceed 25A. If the current is higher, use a separate distribution terminal block. Fig. 21-4 Daisy chaining of outputs Fig.
PAGE 22
CD5.121 DC/DC Converter 12V, 8A CD-Series 21.12. MOUNTING ORIENTATIONS Mounting orientations other than input terminals on the bottom and output on the top require a reduction in continuous output power or a limitation in the max. allowed ambient temperature. The amount of reduction influences the lifetime expectancy of the DC/DC converter. Therefore, two different derating curves for continuous operation can be found below: Curve A1 Curve A2 Recommended output current.