Puls CD10.242 DC/DC converter Owner's Manual

CD10.242
DC/DC Converter 48V/24V, 10A, 240W
CD-Series
DC/DC CONVERTER
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48V DC-input
Isolated 24Vdc output
Efficiency 94%
Width only 42mm
20% Output power reserves
Full power between -25°C and +60°C
Soft-start function
Minimal inrush current surge
Reverse input polarity protection
DC-OK relay contact
Current sharing feature for parallel use
3 Year warranty
PRODUCT DESCRIPTION
SHORT-FORM DATA
The CD10.242 is a DIN rail mountable DC/DC converter
of the highly reliable DIMENSION series. It provides a
floating,
stabilized
and
galvanically
separated
SELV/PELV output voltage of 24Vdc with 48Vdc on the
input.
Output voltage
Adjustment range
Output current
The efficiency of 94% and a slim design are cost- and
space-saving, while at the same time offering additional
power reserves of 20% which may even be used
continuously at ambient temperatures up to +45°C.
For even higher power needs, multiple devices can be
connected in parallel. At any time, a DC-OK LED and a
signal contact are informing about the status of the
device.
A high immunity to transients and power surges as well
as low electromagnetic emission makes this DC/DC
converter suitable for nearly every situation.
Input voltage
Input current
Input inrush current
Efficiency
Power losses
Hold-up time
Temperature range
Size (W x H x D)
Weight
DC 24V
Nominal
24 – 28V
Factory setting 24.1V
12 – 10.3A
Below +45°C ambient
10 – 8.6A
At +60°C ambient
7.5 – 6.5A
At +70°C ambient
Derate between +45°C and +70°C
DC 48V
±25%
5.4A
5.8A peak
94%
15.4W
7ms
-25°C to +70°C
42x124x117mm Without DIN rail
520g / 1.15lb
For 24Vdc/24Vdc or 48Vdc/48Vdc converters, please see
PULS products CD10.241 resp. CD10.482.
ORDER NUMBERS
MAIN APPROVALS
For details or a complete approval list, see chapter 19.
DC/DC Converter
CD10.242
Mechanical Accessory
ZM10.WALL Wall/panel mount bracket
ZM12.SIDE Side mount bracket
UL 61010-1-201
planned
IECEx
planned
ATEX
planned
Marine
planned
Jul 2021 / Rev. 0.1 DS-CD10.242-EN
All values are typical figures specified at 48Vdc input voltage 24V, 10A output load,
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0
Germany
1/29
CD10.242
DC/DC Converter 48V/24V, 10A, 240W
CD-Series
INDEX
Page
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
Intended Use .......................................................3
Installation Instructions ......................................3
DC-Input...............................................................4
Input Inrush Current ...........................................6
Soft-start Feature ................................................6
Output .................................................................7
Hold-up Time .......................................................8
DC-OK Relay Contact ..........................................9
Efficiency and Power Losses..............................10
Functional Diagram ...........................................11
Front Side and User Elements ...........................11
Terminals and Wiring ........................................12
Lifetime Expectancy ..........................................13
MTBF ..................................................................13
EMC ....................................................................14
Environment ......................................................15
Safety and Protection Features ........................16
Dielectric Strength ............................................17
Page
19. Approved, Fulfilled or Tested Standards ......... 18
20. Regulatory Product Compliance ...................... 19
21. Physical Dimensions and Weight ..................... 20
22. Accessories ........................................................ 21
22.1. ZM10.Wall - Wall/Panel Mount Bracket .. 21
22.2. ZM12.SIDE - Side Mount Bracket ............. 22
22.3. UF20.241 Buffer Module .......................... 23
22.4. YR40.241 - Redundancy Module .............. 23
23. Application Notes ............................................. 24
23.1. Peak Current Capability ........................... 24
23.2. Output Circuit Breakers ............................ 25
23.3. Charging of Batteries ............................... 25
23.4. Series Operation ....................................... 26
23.5. Parallel Use to Increase Output Power .... 26
23.6. Parallel Use for Redundancy .................... 27
23.7. Use in a Tightly Sealed Enclosure ............ 28
23.8. Mounting Orientations ............................ 29
The information given in this document is correct to the best of our knowledge and experience at the time of
publication. If not expressly agreed otherwise, this information does not represent a warranty in the legal sense of the
word. As the state of our knowledge and experience is constantly changing, the information in this data sheet is
subject to revision. We therefore kindly ask you to always use the latest issue of this document (available under
www.pulspower.com).
No part of this document may be reproduced or utilized in any form without our prior permission in writing.
TERMINOLOGY AND ABREVIATIONS
PE and
symbol
PE is the abbreviation for Protective Earth and has the same meaning as the symbol
.
Earth, Ground
This document uses the term “earth” which is the same as the U.S. term “ground”.
t.b.d.
To be defined, value or description will follow later.
DC 48V
A figure displayed with the AC or DC before the value represents a nominal voltage with
standard tolerances included.
E.g.: DC 12V describes a 12V battery disregarding whether it is full (13.7V) or flat (10V)
48Vdc
A figure with the unit (Vac) at the end is a momentary figure without any additional
tolerances included.
may
A key word indicating flexibility of choice with no implied preference.
shall
A key word indicating a mandatory requirement.
should
A key word indicating flexibility of choice with a strongly preferred implementation.
Jul 2021 / Rev. 0.1 DS-CD10.242-EN
All values are typical figures specified at 48Vdc input voltage 24V, 10A output load,
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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Germany
2/29
CD10.242
CD-Series
DC/DC Converter 48V/24V, 10A, 240W
1. INTENDED USE
This device is designed for installation in an enclosure and is intended for commercial use, such as in industrial control,
process control, monitoring, measurement, Audio/Video, information or communication equipment or the like.
Do not use this device in equipment, where malfunctioning may cause severe personal injury or threaten human life without
additional appropriate safety devices, that are suited for the end-application. If this device is used in a manner outside of its
specification, the protection provided by the device may be impaired.
2. INSTALLATION INSTRUCTIONS
WARNING
-
Risk of electrical shock, fire, personal injury or death.
Turn power off before working on the device and protect against inadvertent re-powering.
Do not open, modify or repair the device.
Use caution to prevent any foreign objects from entering into the housing.
Do not use in wet locations or in areas where moisture or condensation can be expected.
Do not touch during power-on, and immediately after power-off. Hot surface may cause burns.
Obey the following installation requirements:
This device may only be installed and put into operation by qualified personnel.
This device does not contain serviceable parts. The tripping of an internal fuse is caused by an internal defect.
If damage or malfunction should occur during installation or operation, immediately turn power off and send unit to the
factory for inspection.
Install device in an enclosure providing protection against electrical, mechanical and fire hazards. Install the device onto a DIN
rail according to EN 60715 with the input terminals on the bottom of the device. Other mounting orientations require a
reduction in output current.
Make sure that the wiring is correct by following all local and national codes. Use appropriate copper cables that are
designed for a minimum operating temperature of 60°C for ambient temperatures up to +45°C, 75°C for ambient
temperatures up to +60°C and 90°C for ambient temperatures up to +70°C. Ensure that all strands of a stranded wire enter
the terminal connection. Unused screw terminals should be securely tightened.
The device is designed for pollution degree 2 areas in controlled environments. No condensation or frost is allowed.
The enclosure of the device provides a degree of protection of IP20. The enclosure does not provide protection against spilled
liquids. The isolation of the devices is designed to withstand impulse voltages up to 1.5kV according to IEC 60664-1.
The input can be powered from batteries or similar DC sources. The voltage between the input terminals and ground must
not exceed 60Vdc continuously. The input must be powered from a PELV or SELV source or an "Isolated Secondary Circuit" in
order to maintain a SELV or PELV output.
Check for correct input polarity. The device will not operate when the voltage is reversed. A disconnecting means shall be
provided for the input of the device.
The device is designed as “Class of Protection I” equipment according to IEC 61140. Do not use without a proper PE
(Protective Earth) connection.
The device is designed for convection cooling and does not require an external fan. Do not obstruct airflow and do not cover
ventilation grid!
The device is designed for altitudes up to 5000m (16400ft). Above 2000m (6560ft) a reduction in output current is required.
Keep the following minimum installation clearances: 40mm on top, 20mm on the bottom, 5mm left and right side. Increase
the 5mm to 15mm in case the adjacent device is a heat source. When the device is permanently loaded with less than 50%,
the 5mm can be reduced to zero.
The device is designed, tested and approved for branch circuits up to 50A without additional protection device. If an external
fuse is utilized, do not use circuit breakers smaller than 16A B- or C-Characteristic to avoid a nuisance tripping of the circuit
breaker.
The maximum surrounding air temperature is +70°C (+158°F). The operational temperature is the same as the ambient or
surrounding air temperature and is defined 2cm below the device.
The device is designed to operate in areas between 5% and 95% relative humidity.
Jul 2021 / Rev. 0.1 DS-CD10.242-EN
All values are typical figures specified at 48Vdc input voltage 24V, 10A output load,
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0
Germany
3/29
CD10.242
DC/DC Converter 48V/24V, 10A, 240W
CD-Series
3. DC-INPUT
The input can be powered from batteries or similar DC sources and must be a PELV or SELV source or an "Isolated
Secondary Circuit" in order to maintain a SELV or PELV output.
Check for correct input polarity. The device will not operate when the voltage is reversed.
DC input
DC input range
Allowed voltage between input
and earth/ground
Allowed input ripple voltage
nom.
Turn-on voltage
Shut-down voltage
Input current
typ.
typ.
typ.
typ.
typ.
typ.
max.
In the frequency range from 47 to 500Hz, the
momentary input voltage must always be within the
specified limits.
35Vdc
Steady-state value, see Fig. 3-1
32Vdc
Steady-state value, see Fig. 3-1
5.4A
At 48Vdc input and 24V, 10A output load, see Fig. 3-3
7.5A
At 36Vdc input and 24V, 10A output load, see Fig. 3-3
200ms
See Fig. 3-1
At 48V, 10A constant current load, 0mF load
150ms
capacitance, see Fig. 3-2
At 48V, 10A constant current load, 5mF load
250ms
capacitance, see Fig. 3-2
500mV
See Fig. 3-2
Installed inside the device, external capacitors on the
1 650µF
input are allowed without any limitations.
See recommendations in chapter 2.
max.
typ.
Turn-on overshoot
Input capacitance
max.
typ.
External input protection
Fig. 3-1 Input voltage range
Fig. 3-2 Turn-on behavior, definitions
Rated input range
Turn-on
Input
Voltage
32.4Vdc
35.0Vdc
VIN
17.5Vdc
18.0Vdc
15.5Vdc
Shut-down
POUT
±25%
Continuous operation
Continuous operation, according to IEC 62477-1
Output
Voltage
- 5%
Start-up
delay
Rise
Time
Overshoot
Start-up delay
Rise time
DC 48V
36-60Vdc
60Vdc or
42.2Vac
10Vpp
Fig. 3-3 Input current vs. output load
Input Current,typ.
9A
t : 36
Inpu
6
Vdc
t: 48
Inpu
3
0 2
Vdc
3
4
5
6
7
8
9 10 11 12A
Output Current
Jul 2021 / Rev. 0.1 DS-CD10.242-EN
All values are typical figures specified at 48Vdc input voltage 24V, 10A output load,
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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Germany
4/29
CD10.242
DC/DC Converter 48V/24V, 10A, 240W
CD-Series
Requirements for the Supplying Source
In certain circumstances, the input filter of the DC/DC converter can show a resonant effect which is caused by the
supplying network. Especially when additional external input filters are utilized, a superimposed AC voltage can be
generated on the input terminals of the DC/DC converter which might cause a malfunction of the unit. Therefore,
additional input filters are not recommended. To avoid the resonant effects, the minimal resistance of the supplying
network which depends on the inductance of the input network, shall be above the boundary curve in Fig. 3-4.
Fig. 3-4 External input filter requirements to
avoid filter instabilities
Resistance of the
supplying network
1 Ohm
100 mOhm
(a)
(b)
10 mOhm
(a) max.
(b) typ.
1 mOhm
0.1mH
1mH
10mH
Inductance of the supplying network
Jul 2021 / Rev. 0.1 DS-CD10.242-EN
All values are typical figures specified at 48Vdc input voltage 24V, 10A output load,
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0
Germany
5/29
CD10.242
DC/DC Converter 48V/24V, 10A, 240W
CD-Series
4. INPUT INRUSH CURRENT
An active inrush limitation circuit (inrush limiting NTC resistor which is bypassed by a MOSFET) 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
Inrush energy
max.
typ
typ.
max.
8Apeak
7Apeak
5.8Apeak
1A2s
At 40°C, cold start
At 40°C, cold start
At 25°C, cold start
At 40°C, cold start
Fig. 4-1 Typical input inrush current behavior at nominal load and 25°C
ambient
5. SOFT-START FEATURE
After the DC/DC converter is turned on, the internal output current rises slowly to its nominal value. This method
charges the output capacitors (internal and external capacitors) slowly and avoids high input currents during turn-on.
High input currents can produce a high voltage drop on the input wiring (especially with long and thin cables) which
reduces the terminal voltage on the DC/DC converter. If the terminal voltage is below the shut-down voltage, the
DC/DC converter will turn-off and will make a new start-up attempt. This effect is avoided with the integrated softstart function. Please note that this function increases the rise time of the output voltage by a small amount.
Jul 2021 / Rev. 0.1 DS-CD10.242-EN
All values are typical figures specified at 48Vdc input voltage 24V, 10A output load,
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0
Germany
6/29
CD10.242
DC/DC Converter 48V/24V, 10A, 240W
CD-Series
6. OUTPUT
The output provides a SELV/PELV rated voltage, which is galvanically isolated from the input voltage and is designed
to supply any kind of loads, including unlimited capacitive and inductive loads.
The output is electronically protected against overload, no-load and short-circuits. In case of a protection event,
audible noise may occur.
Output voltage
Adjustment range
Factory setting
Line regulation
Load regulation
Ripple and noise voltage
Output current
Overload behavior
Overload/ short-circuit current
Output capacitance
Back-feeding loads
nom.
max.
24V
24-28V
30V
max.
max.
24.1V
25mV
100mV
typ.
1000mV
max.
nom.
nom.
nom.
nom.
nom.
nom.
100mVpp
12A
10A
7.5A
10.3A
8.6A
6.5A
Continuous current
16A
4 500µF
35V
max.
typ.
max.
Fig. 6-1 Output voltage vs. output current at
48Vdc input voltage, typ.
Guaranteed value from 23-28V
This is the maximum output voltage which can occur
at the clockwise end position of the potentiometer due
to tolerances. It is not a guaranteed value which can be
achieved.
±0.2%, at full load, cold unit
Between 18 and 35Vdc input voltage variation
In “single use” mode: static value, 0A  10A, see Fig. 6-2
In “parallel use” mode: static value, 0A  10A,
see Fig. 6-2
Bandwidth 20Hz to 20MHz, 50Ohm
At 24V and an ambient temperature below +45°C
At 24V and +60° ambient temperature
At 24V and +70° ambient temperature
At 28V and an ambient temperature below +45°
At 28V and +60° ambient temperature
At 28V and +70° ambient temperature
Continuous current
Included inside the power supply
The unit is resistant and does not show malfunctioning
when a load feeds back voltage to the power supply. It
does not matter whether the power supply is on or off.
The absorbing energy can be calculated according to the
built-in large sized output capacitor.
Fig. 6-2 Current limitation vs. input voltage,
(46V constant voltage load), typ.
Jul 2021 / Rev. 0.1 DS-CD10.242-EN
All values are typical figures specified at 48Vdc input voltage 24V, 10A output load,
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0
Germany
7/29
CD10.242
DC/DC Converter 48V/24V, 10A, 240W
CD-Series
7. 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. If prevention is needed, an external
diode should be used.
At no load, the hold-up time can be up to several seconds. The green DC-OK LED is also on during this time.
Hold-up Time
typ.
min.
typ.
min.
14ms
11ms
7ms
5ms
At 24Vdc input voltage, 24V, 5A output, see Fig. 7-1
At 24Vdc input voltage, 24V, 5A output, see Fig. 7-1
At 24Vdc input voltage, 24V, 10A output, see Fig. 7-1
At 24Vdc input voltage, 24V, 10A output, see Fig. 7-1
Fig. 7-1 Hold-up time vs. input voltage
Hold-up Time
(a)
18ms (a) 24V, 5A, typ.
15
(b)
(b) 24V, 5A, min.
(c) 24V, 10A, typ.
(d) 24V, 10A, min.
(c)
12
(d)
9
6
3
Input Voltage
0
36
40
44
48
52
56 60Vdc
Fig. 7-2 Shut-down test setup
S1
+
DC
Source
-
DC/DC
Converter
Input
+
Intput
Voltage
S1 opens
+
CD10
Output -
Fig. 7-3 Shut-down behavior, definitions
Load
-
- 5%
Output
Voltage
Hold-up Time
Jul 2021 / Rev. 0.1 DS-CD10.242-EN
All values are typical figures specified at 48Vdc input voltage 24V, 10A output load,
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0
Germany
8/29
CD10.242
CD-Series
DC/DC Converter 48V/24V, 10A, 240W
8. DC-OK RELAY CONTACT
This feature monitors the output voltage on the output terminals.
Threshold voltage
Contact closes
Contact opens
Contact ratings
Isolation voltage
typ.
21V (fixed)
As soon as the output voltage reaches 21V.
As soon as the output voltage falls below 21V.
Maximal 60Vdc 0.3A, 30Vdc 1A, 30Vac 0.5A, resistive load
Minimal permissible load 1mA at 5Vdc
See dielectric strength table in chapter 18.
Fig. 8-1 DC-OK relay contact behavior
Jul 2021 / Rev. 0.1 DS-CD10.242-EN
All values are typical figures specified at 48Vdc input voltage 24V, 10A output load,
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0
Germany
9/29
CD10.242
DC/DC Converter 48V/24V, 10A, 240W
CD-Series
9. EFFICIENCY AND POWER LOSSES
Efficiency
Average efficiency*)
Power losses
*)
typ.
typ.
typ.
DC 48V
94.0%
93.5%
93.8%
typ.
typ.
typ.
typ.
1.2W
7.5W
15.4W
20W
At 24V, 10A
At 24V, 12A (Power Boost)
At 25% at 2.5A, 25% at 5A,
25% at 7.5A. 25% at 10A
At no output load
At 24V, 5A
At 24V, 10A
At 24V, 12A
The average efficiency is an assumption for a typical application where the power supply is loaded with 25% of the nominal load for 25%
of the time, 50% of the nominal load for another 25% of the time, 75% of the nominal load for another 25% of the time and with 100%
of the nominal load for the rest of the time.
Fig. 9-1
Efficiency vs. output current at 24V, typ.
Fig. 9-2
Losses vs. output current at 24V, typ.
Fig. 9-3
Efficiency vs. input voltage at 48V, 10A,
typ.
Fig. 9-4
Losses vs. input voltage at 48V, 10A, typ.
Efficiency
94.5%
94.0
93.5
93.0
92.5
92.0
36
40
44
48
52
56
60Vdc
Input Voltage
Jul 2021 / Rev. 0.1 DS-CD10.242-EN
All values are typical figures specified at 48Vdc input voltage 24V, 10A output load,
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0
Germany
10/29
CD10.242
DC/DC Converter 48V/24V, 10A, 240W
CD-Series
10. FUNCTIONAL DIAGRAM
Fig. 10-1 Functional diagram
Link for
Parallel Use
Output
Voltage
Regulator
VOUT
+
PE
Input
Fuse
&
Input
Filter
Reverse
Polarity
Protection
&
Inrush
Limiter
Output OverVoltage Protection
Power
Converter
Output
Voltage
Monitor
Output
Filter
DC OK
Relay
+
DC Ok
Contact
DC Ok
LED
11. FRONT SIDE AND USER ELEMENTS
Fig. 11-1 Front side
A
B1
B2
C
D
E
Input terminals
+ Positive input
- Negative input
PE --> Protective Earth (Ground) connection
Output terminals
Single terminal for the positive pole and dual terminals for the
negative pole. Both negative poles are internally connected.
+ Positive output
- Negative (return) output
DC-OK relay contact
The DC-OK relay contact is synchronized with the DC-OK LED.
See chapter 8 for details.
Output voltage potentiometer
DC-OK LED (green)
The LED is on, when the output voltage is above 21V.
“Parallel Use” “Single Use” link
Link the two terminal poles when outputs of devices are
connected in parallel. In order to achieve a sharing of the load
current between the individual devices, the “parallel use”
regulates the output voltage in such a manner that the voltage
at no load is approx. higher than at nominal load.
See chapter 23.5 for details.
Jul 2021 / Rev. 0.1 DS-CD10.242-EN
All values are typical figures specified at 48Vdc input voltage 24V, 10A output load,
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0
Germany
11/29
CD10.242
DC/DC Converter 48V/24V, 10A, 240W
CD-Series
12. TERMINALS AND WIRING
The terminals are IP20 Finger safe constructed and suitable for field- and factory wiring.
Input
Screw terminals
max. 6mm2
max. 4mm2
20-10 AWG
2.8mm
1Nm, 9lb.in
7mm / 0.28inch
3.5mm slotted or Phillips No 1
Type
Solid wire
Stranded wire
American Wire Gauge
Max. wire diameter (including ferrules)
Recommended tightening torque
Wire stripping length
Screwdriver
Output
Screw terminals
max. 6mm2
max. 4mm2
20-10 AWG
2.8mm
1Nm, 9lb.in
7mm / 0.28inch
3.5mm slotted or Phillips No 1
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. 12-1 Daisy chaining of outputs
Fig. 12-2 Using distribution terminals
max 25A!
Output
+ + - -
Output
+ + - -
+
-
Load
Output
+ + - -
Output
+ + - -
DC/DC
Converter
DC/DC
Converter
DC/DC
Converter
DC/DC
Converter
Input
Input
Input
Input
+
Distribution
Terminals
Jul 2021 / Rev. 0.1 DS-CD10.242-EN
All values are typical figures specified at 48Vdc input voltage 24V, 10A output load,
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0
Germany
-
Load
12/29
CD10.242
DC/DC Converter 48V/24V, 10A, 240W
CD-Series
13. LIFETIME EXPECTANCY
The Lifetime expectancy shown in the table indicates the minimum operating hours (service life) and is determined by
the lifetime expectancy of the built-in electrolytic capacitors. Lifetime expectancy is specified in operational hours and
is calculated according to the capacitor’s manufacturer specification. The manufacturer of the electrolytic capacitors
only guarantees a maximum life of up to 15 years (131 400h). Any number exceeding this value is a calculated
theoretical lifetime which can be used to compare devices.
Lifetime expectancy
Input 48Vdc
275 000h
117 000h
70 000h
788 000h
327 000h
197 000h
At 24V, 5A and 40°C
At 24V, 10A and 40°C
At 24V, 12A and 40°C
At 24V, 5A and 25°C
At 24V, 10A and 25°C
At 24V, 12A and 25°C
14. MTBF
MTBF stands for Mean Time Between Failure, which is calculated according to statistical device failures, and indicates
reliability of a device. It is the statistical representation of the likelihood of a unit to fail and does not necessarily
represent the life of a product.
The MTBF figure is a statistical representation of the likelihood of a device to fail. A MTBF figure of e.g. 1 000 000h
means that statistically one unit will fail every 100 hours if 10 000 units are installed in the field. However, it cannot be
determined if the failed unit has been running for 50 000h or only for 100h.
For these types of units the MTTF (Mean Time To Failure) value is the same value as the MTBF value.
MTBF SN 29500, IEC 61709
MTBF MIL HDBK 217F
Input 48Vdc
t.b.d.
t.b.d.
t.b.d.
t.b.d.
t.b.d.
t.b.d.
At 24V, 10A and 40°C
At 24V, 10A and 25°C
At 10A and 40°C; Ground Benign GB40
At 10A and 25°C; Ground Benign GB25
At 10A and 40°C; Ground Fixed GF40
At 10A and 25°C; Ground Fixed GF25
Jul 2021 / Rev. 0.1 DS-CD10.242-EN
All values are typical figures specified at 48Vdc input voltage 24V, 10A output load,
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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CD10.242
DC/DC Converter 48V/24V, 10A, 240W
CD-Series
15. EMC
The EMC behavior of the device is designed for applications in industrial environment as well as in residential,
commercial and light industry environments.
The device is investigated according to the generic standards EN 61000-6-1, EN 61000-6-2, EN 61000-6-3 and EN 610006-4.
Without additional measures to reduce the conducted emissions on the output (e.g. by using a filter), the device is not
suited to supply a local DC power network in residential, commercial and light-industrial environments. No restrictions
apply for local DC power networks in industrial environments.
EMC Immunity
Electrostatic discharge
Power lines and housing
Contact discharge
EN 61000-4-2
Air discharge
EN 61000-4-3
80MHz-2.7GHz
2.7GHz-6.0GHz
Input lines
EN 61000-4-4
Output lines
EN 61000-4-5
++/-  chassis ground
+EN 61000-4-5
+ / -  chassis ground
EN 61000-4-6
0.15-80MHz
8kV
15kV
20V/m
10V/m
4kV
2kV
1kV
2kV
500V
1kV
20V
Criterion A
Criterion A
Criterion A
Criterion A
Criterion A
Criterion A
Criterion A
Criterion A
Criterion A
Criterion A
Criterion A
DC-OK signal lines
EN 61000-4-3
80MHz-2.7GHz
2.7GHz-6.0GHz
EN 61000-4-4
DC-OK lines with coupling clamp
20V/m
10V/m
Criterion A
Criterion A
2kV
Criterion A
Surge
EN 61000-4-5
DC-OK lines  chassis ground
1kV
Criterion A
Conducted disturbance
EN 61000-4-6
0.15-80MHz
20V
Criterion A
Electromagnetic RF field
Fast transients (Burst)
Surge voltage on input
Surge voltage on output
Conducted disturbance
EMC Immunity
Electromagnetic RF field
Fast transients (Burst)
Criterions:
A: The device shows normal operation behavior within the defined limits.
C: Temporary loss of function is possible. The device may shut down and restarts by itself. No damage or hazards for the device will occur.
EMC Emission
Conducted emission on
input lines
Limits for DC power networks
according to EN 61000-6-3
fulfilled
Limits for DC power networks
according IEC 61000-6-4 fulfilled
IEC/CISPR 16-1-2, IEC/CISPR 16-2-1
Conducted emission on
IEC/CISPR 16-1-2, IEC/CISPR 16-2-1
output lines
Radiated emission
EN 55011, EN 55032
Class B
This device complies with FCC Part 15 rules.
Operation is subjected to following two conditions: (1) this device may not cause harmful interference, and (2) this
device must accept any interference received, including interference that may cause undesired operation.
Switching Frequency
Main converter
75kHz to 500kHz
Output load and input voltage dependent
Jul 2021 / Rev. 0.1 DS-CD10.242-EN
All values are typical figures specified at 48Vdc input voltage 24V, 10A output load,
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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CD10.242
DC/DC Converter 48V/24V, 10A, 240W
CD-Series
16. ENVIRONMENT
The operational temperature is the ambient or
surrounding temperature and is defined as the
air temperature 2cm below the device.
-40°C to +85°C (-40°F to 185°F)
For storage and transportation
3.2W/°C
Between +45°C and +60°C (113°F to 140°F)
6W/°C
Between +60°C and +70°C (140°F to 158°F)
15W/1000m or 5°C/1000m
For altitudes >2000m (6560ft), see Fig. 15-2
For atmospheric pressures <80kPa, see Fig. 15-2
9W/-5kPa or 3°C/-5kPa
The de-rating is not hardware controlled. The customer has to take care by himself to
stay below the de-rated current limits in order not to overload the unit.
5 to 95% r.h.
According to IEC 60068-2-30
110-47kPa
See Fig. 15-2 for details
Up to 5000m (16 400ft)
See Fig. 15-2 for details
2
According to IEC 62477-1, not conductive
2-17.8Hz: ±1.6mm; 17.8-500Hz: 2g
According to IEC 60068-2-6
2 hours / axis
30g 6ms, 20g 11ms
According to IEC 60068-2-27
3 bumps / direction, 18 bumps in total
Shock and vibration is tested in combination with DIN rails according to EN 60715 with a
height of 15mm and a thickness of 1.3mm and standard orientation.
Some audible noise may be emitted from the power supply during no load, overload or
short circuit.
Operational temperature
-25°C to +70°C (-13°F to 158°F)
Storage temperature
Output de-rating
Humidity
Atmospheric pressure
Altitude
Degree of pollution
Vibration sinusoidal
Shock
Audible noise
Fig. 16-1 Output current vs. ambient temp.
Allowed Output Current at 24V
12A
12A
B
A
10A
A... Continuous
B... Short term
6A
4A
0
-25
C
B
10A
A
8A
8A
2A
Fig. 16-2 Output current vs. altitude at 48V
Allowed Output Current at 24V
6A
4A
2A
Ambient Temperature
0
20
40
60 70°C
A... Ambient < 60°C
B... Ambient < 45°C
C... Short term
Altitude 0m
AP*) 110kPa
2000m
80kPa
*) Atmospheric pressure
4000m
62kPa
6000m
47kPa
Jul 2021 / Rev. 0.1 DS-CD10.242-EN
All values are typical figures specified at 48Vdc input voltage 24V, 10A output load,
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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CD10.242
DC/DC Converter 48V/24V, 10A, 240W
CD-Series
17. SAFETY AND PROTECTION FEATURES
Isolation resistance
min.
500MOhm
min.
500MOhm
min.
500MOhm
min.
500MOhm
PE resistance
max.
0.1Ohm
Output over-voltage protection
typ.
max.
Class of protection
Degree of protection
Over-temperature protection
Input transient protection
Internal input fuse
Touch current (leakage current)
At delivered condition between input and output,
measured with 500Vdc
At delivered condition between input and Chassis
Ground, measured with 500Vdc
At delivered condition between output and Chassis
Ground, measured with 500Vdc
At delivered condition between output and DC-OK
contacts, measured with 500Vdc
Resistance between PE terminal and the housing in
the area of the DIN rail mounting bracket.
31Vdc
32.5Vdc
In case of an internal defect, a redundant circuit limits the maximum
output voltage. The output shuts down and automatically attempts to
restart.
I
According to IEC 61140
IP 20
According to EN/IEC 60529
Not included
MOV (Metal
For protection values see chapter 15 (EMC).
Oxide Varistor)
Not user replaceable slow-blow high-braking
Included
capacity fuse
The leakage current, which is produced by the DC/DC converter itself, depends on
the input voltage ripple and need to be investigated in the final application.
For a smooth DC input voltage, the produced leakage current is less than 100µA.
Jul 2021 / Rev. 0.1 DS-CD10.242-EN
All values are typical figures specified at 48Vdc input voltage 24V, 10A output load,
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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CD10.242
DC/DC Converter 48V/24V, 10A, 240W
CD-Series
18. DIELECTRIC STRENGTH
The output voltage is floating and has no ohmic connection to the ground.
The output is insulated to the input by a double or reinforced insulation.
Type and routine 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 inputterminals together as well as all output poles before conducting the test. When testing, set the cut-off current settings
to the value in the table below.
We recommend that either the (+) pole or the (-) pole shall be connected to the protective earth system. This helps to
avoid situations in which a load starts unexpectedly or cannot be switched off when unnoticed earth faults occur.
Type test
60s
A
1500Vac
B
1500Vac
C
500Vac
D
500Vac
Routine test
5s
1500Vac
1500Vac
500Vac
500Vac
Field test
5s
1000Vac
1000Vac
500Vac
500Vac
>20mA
>10mA
>12mA
>1mA
Fig. 18-1 Dielectric strength
Field test cut-off
current setting
B*) When testing input to DC-OK ensure that the maximal voltage
between DC-OK and the output is not exceeded (column D). We
recommend connecting DC-OK pins and the output pins together
when performing the test.
Jul 2021 / Rev. 0.1 DS-CD10.242-EN
All values are typical figures specified at 48Vdc input voltage 24V, 10A output load,
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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CD10.242
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DC/DC Converter 48V/24V, 10A, 240W
19. APPROVED, FULFILLED OR TESTED STANDARDS
UL 61010
planned
IEC 61010
planned
ATEX
planned
IECEx
planned
Marine (DNV)
planned
ISA-71.04-1985
VDMA 24364
UL Certificate
Listed equipment for category NMTR - UL 61010-2-201 Electrical
Equipment for Measurement, Control and Laboratory Use Particular requirements for control equipment
Applicable for US and Canada
E-File: E198865
CB Scheme Certificate
IEC 61010-2-201 Electrical Equipment for Measurement, Control
and Laboratory Use - Particular requirements for control
equipment
Agency Certificate (Bureau Veritas)
EN 60079-0 Explosive atmospheres - General requirements
EN 60079-7, EN 60079-15 Equipment protection by type of
protection "e" and "n"
Certificate: t.b.d.
Temperature Code: t.b.d.
Type of Protection: t.b.d.
IECEx Certificate
IEC 60079-0 Explosive atmospheres - General requirements
IEC 60079-7, IEC 60079-15 Equipment protection by type of
protection "e" and "n"
Certificate: t.b.d.
Temperature Code: t.b.d.
Type of Protection: t.b.d.
DNV Certificate
DNV Type approved product
Certificate: t.b.d.
Temperature: t.b.d.
Humidity: t.b.d.
Vibration: t.b.d.
EMC: t.b.d.
Enclosure: t.b.d.
Manufacturer's Declaration (Online Document)
Airborne Contaminants Corrosion Test
Severity Level: G3 Harsh
H2S: 100ppb
NOx: 1250ppb
Cl2: 20ppb
SO2: 300ppb
Test Duration: 3 weeks, which simulates a service life of at least 10
years
Paint Wetting Impairment Substances Test (or LABS-Test)
Tested for Zone 2 and test class C1 according to VDMA 24364-C1L/W for solvents and water-based paints
Jul 2021 / Rev. 0.1 DS-CD10.242-EN
All values are typical figures specified at 48Vdc input voltage 24V, 10A output load,
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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CD10.242
DC/DC Converter 48V/24V, 10A, 240W
CD-Series
20. REGULATORY PRODUCT COMPLIANCE
EU Declaration of
Conformity
REACH Directive
EAC TR Registration
The CE mark indicates conformance with the
- EMC directive
- RoHS directive
Manufacturer's Statement
EU-Directive regarding the Registration, Evaluation,
Authorization and Restriction of Chemicals
EAC Certificate
EAC EurAsian Conformity - Registration Russia, Kazakhstan
and Belarus
8504408200, 8504409000
Jul 2021 / Rev. 0.1 DS-CD10.242-EN
All values are typical figures specified at 48Vdc input voltage 24V, 10A output load,
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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DC/DC Converter 48V/24V, 10A, 240W
21. PHYSICAL DIMENSIONS AND WEIGHT
Width
Height
Depth
Weight
DIN rail
Housing material
Installation clearances
Penetration protection
42mm 1.65’’
124mm 4.88’’
117mm 4.61’’
The DIN rail height must be added to the unit depth to calculate the total required
installation depth.
520g / 1.15lb
Use 35mm DIN rails according to EN 60715 or EN 50022 with a height of 7.5 or 15mm.
Body: Aluminium alloy
Cover: zinc-plated steel
See chapter 2
Small parts like screws, nuts, etc. with a diameter larger than 3.5mm
Fig. 21-1 Front view
Fig. 21-2 Side view
All dimensions in mm
All dimensions in mm
Jul 2021 / Rev. 0.1 DS-CD10.242-EN
All values are typical figures specified at 48Vdc input voltage 24V, 10A output load,
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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20/29
CD10.242
CD-Series
DC/DC Converter 48V/24V, 10A, 240W
22. ACCESSORIES
22.1. ZM10.WALL - WALL/PANEL MOUNT BRACKET
This bracket is used to mount the devices on a wall/panel without utilizing the DIN rail. The bracket can be mounted
without detaching the DIN rail brackets from the power supply.
Fig. 22-1 Isometric view
Fig. 22-2 Isometric view
Fig. 22-3 Isometric view
Fig. 21 4 Wall/panel mounting, front
view
Fig. 21 5 Hole pattern for wall
mounting
Fig. 22-4 Wall/panel mounting, side view
All dimensions in mm
All dimensions in mm
All dimensions in mm
Jul 2021 / Rev. 0.1 DS-CD10.242-EN
All values are typical figures specified at 48Vdc input voltage 24V, 10A output load,
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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DC/DC Converter 48V/24V, 10A, 240W
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22.2. ZM12.SIDE - SIDE MOUNT BRACKET
This ZM12.SIDE bracket is used to mount the device sideways with or without utilizing a DIN rail to
save installation depth.
The two aluminum brackets and the black plastic slider of the unit have to be detached, so that the
ZM12.SIDE steel bracket can be mounted.
For sideway DIN rail mounting, the removed aluminum brackets and the black plastic slider need to be
mounted on the ZM12.SIDE steel bracket.
PSU for illustration purpose only.
Fig. 22-5 Side mounting
without DIN rail brackets
Fig. 22-6 Side mounting with
DIN rail brackets
Fig. 22-7 Hole pattern
All dimensions in mm
Jul 2021 / Rev. 0.1 DS-CD10.242-EN
All values are typical figures specified at 48Vdc input voltage 24V, 10A output load,
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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22/29
CD10.242
CD-Series
DC/DC Converter 48V/24V, 10A, 240W
22.3. UF20.241 BUFFER MODULE
The UF20.241 buffer module is a supplementary device for 24V DC/DC converters. It delivers
power to bridge typical supply voltage faults or extends the hold-up time after the input power is
turned off.
When the DC/DC converter provides a sufficient voltage, the buffer module stores energy in the
integrated electrolytic capacitors. When the input voltage is lost, the stored energy is released to
the DC-bus in a regulated process.
The buffer module can be added in parallel to the load circuit at any given point and does not
require any control wiring.
One buffer module can deliver 20A additional current and can be added in parallel to increase
the output ampacity or the hold-up time.
For longer hold-up times the UF40.241 might also be an option.
22.4. YR40.241 - REDUNDANCY MODULE
The YR40.241 is a dual redundancy module, which can be used to build 1+1 or N+1 redundant
systems.
The device is equipped with two 20A nominal input channels, which are individually decoupled by
utilizing MOSFET technology. The output can be loaded with a nominal 40A continuous current.
Using MOSFETSs instead of diodes reduces heat generation, losses and voltage drop between input
and output. Due to these advantages, the unit is very narrow and only requires 36mm width on the
DIN rail.
The device does not require an additional auxiliary voltage and is self-powered even in case of a
short circuit across the output.
A feature of this redundancy module is a special circuit, which keeps the losses and temperature
low, even at overload and short circuit conditions up to 65A continuous current.
See chapter 12 for wiring information.
Jul 2021 / Rev. 0.1 DS-CD10.242-EN
All values are typical figures specified at 48Vdc input voltage 24V, 10A output load,
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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CD10.242
DC/DC Converter 48V/24V, 10A, 240W
CD-Series
23. APPLICATION NOTES
23.1. PEAK CURRENT CAPABILITY
The unit can deliver peak currents (up to several milliseconds) which are higher than the specified short term currents.
This helps to start current demanding loads. 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. The same situation applies when starting a capacitive load.
The peak current capability also ensures the safe operation of subsequent circuit breakers of load circuits. The load
branches are often individually protected with circuit breakers or fuses. In case of a short or an overload in one branch
circuit, the fuse or circuit breaker need a certain amount of over-current to open in a timely manner. This avoids
voltage loss in adjacent circuits.
The extra current (peak current) is supplied by the power converter and the built-in large sized output capacitors of
the power supply. The capacitors get discharged during such an event, which causes a voltage dip on the output. The
following two examples show typical voltage dips:
Fig. 23-1 20A Resistive peak load (2x the nominal
current) for 50ms, typ.
Peak current voltage dips
typ.
typ.
typ.
from 24V to 14V
from 24V to 12V
from 24V to 6V
Fig. 23-2 50A Resistive peak load (5x the nominal
current) for 5ms, typ.
at 20A for 50ms, resistive load
at 40A for 2ms, resistive load
at 40A for 5ms, resistive load
Jul 2021 / Rev. 0.1 DS-CD10.242-EN
All values are typical figures specified at 48Vdc input voltage 24V, 10A output load,
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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DC/DC Converter 48V/24V, 10A, 240W
CD-Series
23.2. OUTPUT CIRCUIT BREAKERS
Standard miniature circuit breakers (MCBs) are commonly used for AC supply systems, but can also be used in DC
branches if specified.
Such MCBs are designed to protect wires and circuits. When the ampere rating and characteristics of the MCB are
matched to the wire size used, the wiring is considered thermally safe whether the MCB opens or not.
To avoid voltage dips and undervoltage situations in adjacent DC branches fed by the same source, fast (magnetic)
tripping of the MCB is desirable. For example, a fast trip within 10ms avoids a shutdown and restart of the PLC. For this
purpose, power supplies with high current reserves and large output capacitors are advantageous. In addition, the
impedance of the faulty circuit must be sufficiently small so that the current can actually flow. The best current
reserves of a power supply are of no help if Ohm's law does not allow the current to flow.
The following table provides typical test results showing which MCBs magnetically trip as a function of wire size and
length. The lengths given correspond to the total length, which is the sum of the outgoing (+) and return (-) wire. The
tests were performed without additional load.
Fig. 23-3 Test circuit for maximum wire length
DC/DC
Converter
DC
MCB
Load
+
+
Wire length
S1
-
DC S1... Fault simulation switch
Test results for maximum wire length:
C-2A
C-3A
C-4A
C-6A
C-8A
B-6A
B-10A
0.75mm²
23m
14m
8m
2m
0m
11m
2m
1.0mm²
32m
18m
9m
2m
1m
13m
2m
1.5mm²
43m
26m
14m
4m
1m
21m
4m
2.5mm²
62m
39m
18m
6m
1m
29m
4m
B-13A
1m
1m
1m
2m
23.3. CHARGING OF BATTERIES
The device can be used to charge lead-acid or maintenance free batteries. Four 12V SLA or VLRA batteries are needed
in series connection.
Instructions for charging batteries:
a)
Ensure that the ambient temperature of the Device is below 45°C.
b)
Set output voltage, measured at no load and at the battery end of the cable, very precisely to the end-of-charge
voltage.
End-of-charge voltage
27.8V
27.5V
27.15V
26.8V
Battery temperature
10°C
20°C
30°C
40°C
c)
Use a 16A circuit breaker or blocking diode between the Device and the battery.
d)
Ensure that the output current of the Device is below the allowed charging current of the battery.
e)
Use only matched batteries when putting 12V types in series.
f)
The return current to the device (battery discharge current) is typ. 10mA when the Device is switched off except
in case a blocking diode is utilized.
g)
Do not use the devices for battery charging in mounting orientations other than the standard mounting
orientation or in any other condition where a reduction of the output current is required (e.g. altitude).
Jul 2021 / Rev. 0.1 DS-CD10.242-EN
All values are typical figures specified at 48Vdc input voltage 24V, 10A output load,
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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CD10.242
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DC/DC Converter 48V/24V, 10A, 240W
23.4. SERIES OPERATION
Unit A
Devices of the same type can be connected in series for higher output voltages.
It is possible to connect as many units in series as needed, providing the sum of
the output voltage does not exceed 150Vdc. Voltages with a potential above
60Vdc must be installed with a protection against touching.
Avoid return voltage (e.g. from a decelerating motor or battery) which is
applied to the output terminals.
Input
Output
Unit B
Input
Keep an installation clearance of 15mm (left / right) between two power
supplies and avoid installing the power supplies on top of each other. Do not
use power supplies in series in mounting orientations other than the standard
mounting orientation.
Output
+
Load
-
+
+
-
-
Pay attention that EMI and inrush current will increase when using multiple devices.
23.5. PARALLEL USE TO INCREASE OUTPUT POWER
Unit A
Devices can be paralleled to increase the output power. The output voltage of all
power supplies shall be adjusted to the same value (±100mV) in “Single Use”
mode with the same load conditions on all units, or the units can be left with the
factory settings. After the adjustments, set the unit to “Parallel Use” mode, in
order to achieve load sharing. The “Parallel Use” mode regulates the output
voltage in such a manner that the voltage at no load is approx. 4% higher than
at nominal load. See also chapter 6.
Input
Output
Unit B
Input
The ambient temperature is not allowed to exceed +60°C.
+
-
Load
+
+
-
Output
If more than three devices are connected in parallel, a diode, fuse or circuit
breaker with a rating of 15A or 16A is required on each output. Alternatively, a diode or redundancy module can also
be utilized.
Keep an installation clearance of 15mm (left / right) between two devices and avoid installing devices on top of each
other. Do not use devices in parallel in mounting orientations other than the standard mounting orientation or in any
other condition where a reduction of the output current is required (e.g. altitude).
Pay attention that leakage current, EMI, inrush current will increase when using multiple devices.
Jul 2021 / Rev. 0.1 DS-CD10.242-EN
All values are typical figures specified at 48Vdc input voltage 24V, 10A output load,
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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CD10.242
DC/DC Converter 48V/24V, 10A, 240W
CD-Series
23.6. PARALLEL USE FOR REDUNDANCY
1+1 Redundancy:
Devices can be paralleled for redundancy to gain higher system availability. Redundant systems require a certain
amount of extra power to support the load in case one device fails. The simplest way is to put two devices in parallel.
This is called a 1+1 redundancy. In case one device fails, the other one is automatically able to support the load current
without any interruption. It is essential to use a redundancy module to decouple devices from each other. This
prevents that the defective unit becomes a load for the other device and the output voltage cannot be maintained any
more.
1+1 redundancy allows ambient temperatures up to +70°C.
Pay attention that EMI and inrush current will increase when using multiple devices.
Recommendations for building redundant power systems:
- Use separate input fuses for each device.
- Use separate supply systems for each device whenever it is possible.
- It is desirable to set the output voltages of all devices to the same value (± 100mV) or leave it at the factory setting.
N+1 Redundancy:
Redundant systems for a higher power demand are usually built in a N+1 method. E.g. four devices, each rated for 10A
are paralleled to build a 30A redundant system.
Pay attention that EMI and inrush current will increase when using multiple devices.
Keep an installation clearance of 15mm (left / right) between two devices and avoid installing the devices on top of
each other.
Do not use devices in parallel in mounting orientations other than the standard mounting orientation or in any other
condition, where a reduction of the output current is required.
For N+1 redundancy the ambient temperature is not allowed to exceed +45°C.
Wiring examples for 1+1 and n+1 redundancy:
Fig. 23-4 1+1 Redundant configuration for 10A
load current
Fig. 23-5 N+1 Redundant configuration for 30A load current
with multiple DC/DC converters and redundancy modules
Jul 2021 / Rev. 0.1 DS-CD10.242-EN
All values are typical figures specified at 48Vdc input voltage 24V, 10A output load,
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0
Germany
27/29
CD10.242
DC/DC Converter 48V/24V, 10A, 240W
CD-Series
23.7. USE IN A TIGHTLY SEALED ENCLOSURE
When the DC/DC Converter is installed in a tightly sealed enclosure, the temperature inside the enclosure will be
higher than outside. In such situations, the inside temperature defines the ambient temperature for the DC/DC
Converter.
The following measurement results can be used as a reference to estimate the temperature rise inside the enclosure.
The DC/DC Converter is placed in the middle of the box, no other heat producing items are inside the box.
The temperature sensor inside the box is placed in the middle of the right side of the DC/DC Converter with a distance
of 1cm.
Enclosure size
Input voltage
Load
Temperature inside the box
Temperature outside the box
Temperature rise
Case A
110x180x165mm
Rittal Typ IP66 Box
PK 9516 100,
plastic
48Vdc
24V, 8A; (=80%)
45.4°C
21.0°C
24.4K
Case B
110x180x165mm
Rittal Typ IP66 Box
PK 9516 100,
plastic
48Vdc
24V, 10A; (=100%)
52.4°C
21.0°C
31.4K
Jul 2021 / Rev. 0.1 DS-CD10.242-EN
All values are typical figures specified at 48Vdc input voltage 24V, 10A output load,
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0
Germany
28/29
CD10.242
DC/DC Converter 48V/24V, 10A, 240W
CD-Series
23.8. 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 maximum allowed ambient temperature.
The listed lifetime and MTBF values from this datasheet apply only for the standard mounting orientation.
The following curves give an indication for allowed output currents for altitudes up to 2000m (6560ft).
Fig. 23-6
Mounting
Orientation A
(Standard
orientation)
Allowed Output Current at 24V
OUTPUT
12A
10A
DC/DC
Converter
7.5A
0
INPUT
+45
+60 +70°C
Ambient Temperature
Fig. 23-7
Mounting
Orientation B
(Upside down)
Allowed Output Current at 24V
12A
INPUT
7.5A
DC/DC
Converter
0
OUTPUT
Fig. 23-8
Mounting
Orientation C
(Table-top
mounting)
12A
6.5A
+25
+60 +70°C
Ambient Temperature
Allowed Output Current at 24V
12A
OUTPUT
DC/DC
Converter
INPUT
6.5A
0
+25
+60 +70°C
Ambient Temperature
Allowed Output Current at 24V
INPUT
DC/DC
Converter
12A
OUTPUT
Fig. 23-10
Mounting
Orientation E
(Horizontal ccw)
+60 +70°C
Ambient Temperature
Allowed Output Current at 24V
0
Fig. 23-9
Mounting
Orientation D
(Horizontal cw)
+30
6.5A
0
+25
+60 +70°C
Ambient Temperature
Jul 2021 / Rev. 0.1 DS-CD10.242-EN
All values are typical figures specified at 48Vdc input voltage 24V, 10A output load,
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0
Germany
29/29