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Document overview
- Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
- PDF pages: 17
Technical content
Features
– Wide-range voltage input – Galvanic isolation – Reverse polarity protection – Preventive function monitoring – Reliable starting of difficult loads with POWER BOOST static power reserve – Fast tripping of standard ci rcuit breakers with dynamic SFB technology power reserve – High MTBF > 761000 h (40°C) Flexible use – Adjustable output voltage – Can be used in Class I, Division 2, Groups A, B, C, D (Hazardous Location) ANSI-ISA 12.12 Make sure you always use the latest documentation. It can be downloaded from the product at phoenixcontact.net/products. 104793_en_01 2013-05-03
104793_en_01 PHOENIX CONTACT 2 2T a b l e o f c o n t e n t s
104793_en_01 PHOENIX CONTACT 3 Description Type Order No. Pcs. / Pkt. QUINT DC/DC converter for DIN rail mounting, input: primary-switched, 24 V DC, output: 48 V DC/5 A, with integrated SFB (selective fuse breaking) technology, including mounted universal DIN rail adapter UTA 107/30 QUINT-PS/24DC/48DC/ 5 2320128 1 3O r d e r i n g d a t a Accessories Type Order No. Pcs. / Pkt. QUINT power supply unit for DIN rail mounting, input: primary-switched, 1- phase, output: 24 V DC/20 A, with integrated SFB (selective fuse breaking) technology including mounted universal DIN rail adapter UTA 107 QUINT-PS/ 1AC/24DC/20 2866776 1 QUINT power supply unit for DIN rail mounting, input: primary-switched, 3- phase, output: 24 V DC/20 A, with integrated SFB (selective fuse breaking) technology including mounted universal DIN rail adapter UTA 107 QUINT-PS/ 3AC/24DC/20 2866792 1 Redundancy module with function monitoring, 48 V DC, 2x 10 A, 1x 20 A TRIO-DIODE/48DC/2X10/1X20 2866527 1 Universal DIN rail adapter UTA 107/30 2320089 25 Universal wall adapter UWA 182/52 2938235 1 Assembly adapter for QUINT-PS... power supply on S7-300 rail QUINT-PS-ADAPTERS7/1 2938196 1 Thermomagnetic device circuit breaker, 1-pos., tripping characteristic SFB, 1 PDT contact, plug for base element. CB TM1 1A SFB P 2800836 1 Thermomagnetic device circuit breaker, 1-pos., tripping characteristic SFB, 1 PDT contact, plug for base element. CB TM1 2A SFB P 2800837 1 Thermomagnetic device circuit breaker, 1-pos., tripping characteristic SFB, 1 PDT contact, plug for base element. CB TM1 12A SFB P 2800844 1 Thermomagnetic device circuit breaker, 1-pos., tripping characteristic SFB, 1 PDT contact, plug for base element. CB TM1 16A SFB P 2800845 1 Our range of accessories is being continually extended, our current range can be found in the download area.
104793_en_01 PHOENIX CONTACT 4
4 Technical data
Nominal input voltage 24 V DC Nominal input voltage range 18 V DC ... 32 V DC 14 V DC ... 18 V DC (Consider derating during operation) Current consumption 14 A (24 V DC) Inrush current limitation < 15 A (typical) I2t 3 A2s Power failure bypass > 12 ms (24 V DC) Protective circuit Transient surge protection Varistor Protection against polarity reversal ≤ 30 V DC Input fuse, integrated 25 A (internal (device protection)) Output data Nominal output voltage 48 V DC ±1% Setting range of the output voltage 30 V DC ... 56 V DC (> 48 V constant capacity) Output current 5 A (-25 °C ... 60 °C) 6.25 A (with POWER BOOST, -25 °C ... 40 °C permanently, UOUT = 48 V DC)
30 A (SFB technology, 12 ms)
Magnetic fuse tripping B2 / B4 / C2 Current limitation Approximately 7 A Max. capacitive load Unlimited Control deviation < 1 % (change in load, static 10% ... 90%) < 2 % (change in load, dynamic 10% ... 90%) < 0.1 % (change in input voltage ±10%) Efficiency > 92.5 % Ascent time < 2 ms (U OUT (10% ... 90%)) Residual ripple < 20 mVPP Peak switching voltages < 10 mV PP (20 MHz) Connection in parallel Yes, for redundancy and increased capacity Connection in series Yes Protection against surge voltage on the output Yes, limited to < 60 V DC Resistance to reverse feed 60 V DC Power consumption Maximum power dissipation NO-Load 5.2 W Power loss nominal load max. 21 W Status and diagnostic indicator DC OK active Active switching output U OUT > 0.9 x UN: High signal Voltage 24 V DC Current < 20 mA (short-circuit resistant) Status display "DC OK" LED green Status and diagnostic indicator POWER BOOST, active Active switching output I OUT < IN: High signal Voltage 24 V DC Current < 20 mA (short-circuit resistant) Status display "BOOST" LED yellow/IOUT > IN : LED on
104793_en_01 PHOENIX CONTACT 5 Status and diagnostic indicator UIN OK, active Active switching output U IN > 19.2 V: High signal Voltage 24 V DC Current ≤ 20 mA (short-circuit resistant) Status display LED "UIN < 19.2 V" yellow/UIN < 19.2 V DC: LED on Status and diagnostic indicator DC OK floating Active switching output Relay Voltage ≤ 30 V AC/DC Current ≤ 100 mA Status display UOUT > 0.9 x UN: Contact closed General data Insulation voltage input/output 1.5 kV (type test) 1 kV (routine test) MTBF > 761000 h (According to EN 29500) Normal mounting position horizo ntal DIN rail NS 35, EN 60715 Dimensions W/H/D (normal mounting position/delivered condition) 48 mm / 130 mm / 125 mm Dimensions W / H / D (X-axis rotated 270°) 122 mm / 130 mm / 51 mm Weight 0.9 kg Housing Degree of protection IP20 Type of housing Aluminum (AlMg3) Hood version Galvanized sheet st eel, free from chrome (VI) Input connection data Connection method Plu ggable screw connection Conductor cross section AWG/kcmil 24 ... 12 Stripping length 8 mm Screw thread M3 Connection data, output/signals Connection method Plu ggable screw connection Conductor cross section AWG/kcmil 24 ... 12 Stripping length 7 mm Screw thread M3
104793_en_01 PHOENIX CONTACT 6 Ambient conditions Protection class III Ambient temperature (operation) -25 °C ... 70 °C (> 60 °C derating) Ambient temperature (start-up type tested) -40 °C Ambient temperature (storage/transport) -40 °C ... 85 °C Max. permissible relative humidity (operation) ≤ 95 % (at 25 °C, no condensation) Vibration (operation) < 15 Hz, amplitude ±2.5 mm (according to IEC 60068-2-6) Shock 30 g in each direction, according to IEC 60068-2-27 Pollution degree in acc. with EN 50178 2 Climatic class 3K3 (in acc. with EN 60721) Standards Electrical Equipment for Machinery EN 60204 Electrical safety (of information technology equipment - Safety - Part 1) EN 60950-1/VDE 0805 (SELV) Electronic equipment for use in electrical power installations EN 50178/VDE 0160 (PELV) SELV EN 60950-1 (SELV) EN 60204 (PELV) Safe isolation / protection against electric shock DIN VDE 0100-410 Approvals UL approvals UL/C-UL listed UL 508 UL/C-UL Recognized UL 60950 UL ANSI/ISA-12.12.01 Class I, Division 2, Groups A, B, C, D (Hazardous Loca- tion) Shipbuilding Germanischer Lloyd (EMC 1)
104793_en_01 PHOENIX CONTACT 7 Conformance with EMC Directive 2004/108/EC Noise immunity according to EN 61000-6-2 EN 61000-6-2 requirement Tested Electrostatic discharge EN 61000-4-2 Housing contact discharge 4 kV (Test intensity 2) 8 kV (Test intensity 4) Housing air discharge 8 kV (Test in tensity 3) 15 kV (Test intensity 4) Comments Criterion B Criterion A Electromagnetic HF field EN 61000-4-3 Test field strength 10 V/m 10 V/m Test field strength 3 V/m 10 V/m Test field strength 1 V/m 10 V/m Comments Criterion A Criterion A Fast transients (burst) EN 61000-4-4 Input 2 kV (Test intensity 3 - asymmetrical) 2 kV (Test intensity 3 - asymmetrical) Output 2 kV (Test intensity 3 - asymmetrical ) 2 kV (Test intensity 3 - asymmetrical) Signal 1 kV (Test intensity 3 - asymmetrical) 2 kV (Test intensity 4 - asymmetrical) Comments Criterion B Criterion A Surge current loads (surge) EN 61000-4-5 Input 0.5 kV (Test intensity 1 - symmetrical) 0.5 kV (Test intensity 1 - asymmetrical) 1 kV (Test intensity 2 - symmetrical) 2 kV (Test intensity 3 - asymmetrical) Output 0.5 kV (Test intensity 1 - symmetrical) 0.5 kV (Test intensity 1 - asymmetrical) 1 kV (Test intensity 2 - symmetrical) 2 kV (Test intensity 3 - asymmetrical) Signal 1 kV (Test intensity 2 - asymmetrical ) 1 kV (Test intensity 2 - asymmetrical) Comments Criterion B Criterion A Conducted interference EN 61000-4-6 Input/Output/Signal asymmetrical asymmetrical Voltage 10 V (Test intensity 3) 10 V (Test intensity 3) Comments Criterion A Criterion A Emitted interference in acc. with EN 61000-6-3 Radio interference voltage in acc. with EN 55011 EN 55011 (EN 5 5022) Class B, area of application: Industry and residential Emitted radio interference in acc. with EN 55011 EN 55011 (EN 55022) Class B, area of application: Industry and residential All technical specifications are nominal and refer to a room temperature of 25 °C and 70% relative humidity at 100 m above sea level. Current approvals can be found for the product in the download area.
104793_en_01 PHOENIX CONTACT 8
5 Safety regulations and installation
Before startup please ensure: – Only qualified specialist personnel may install, start up, and operate the device. – Observe the national safety and accident prevention regulations. NOTE: Danger if used improperly – The device is a built-in device. – The IP20 degree of protection (IEC 60529/EN 60529) of the device is in- tended for use in a clean and dry environ- ment. Do not subject the device to any load that exceeds the described limits. – Do not subject the device to mechanical and/or thermal loads that exceed the specified limits. – Installation and startup may only be car- ried out by qualified personnel. The rele- vant country-specific regulations must be observed. – It is not permissible to open or modify the device. Do not repair the device yourself but replace it with an equivalent device. Repairs may only be carried out by the manufacturer. The manufacturer is not li- able for damage resulting from violation. CAUTION: Before startup please ensure: – Connection must be performed by spe- cialist personnel and protection against electric shock ensured. – It must be possible to switch off the de- vice outside the power supply according to the regulations in EN 60950-1 (e.g., by line protection on the primary side). – All feed lines are sufficiently protected and dimensioned! – All output lines are dimensioned accord- ing to the maximum output current of the device or separately protected! – Sufficient convection is guaranteed! DANGER OF EXPLOSION! Only remove equipment when it is discon- nected and not in the potentially explosive ar- ea. DANGER Never carry out work on live parts! The housing can become very hot, depending on the ambient temperature and load!
104793_en_01 PHOENIX CONTACT 9
6 Basic circuit diagram
7 Structure
Figure 2 Function elements
1 DC input
2 DC output
3 Potentiometer 30 V DC ... 56 V DC
4 LED "BOOST", yellow
5 "DC OK" LED, green 6 LED "UIN < 19.2 V", yellow 7 UIN > 19.2 V, active switching output
8 DC OK, active switching output
9 I < IIN, active switching output
10 DC OK relay contact 13/14
11 SFB switch (left: SFB activated, right: SFB deactivated)
12 Strain relief for connecting cables
13 DIN rail adapter
8 Installation
U >19,2 VIN I<IN + + 14 _ OK DC IN 19.2VU IN> Output D C 48V 5A Boost DC OK 30-56 V U <19.2 V IN Input D C 24V QUINT P OWER 19.2V >IN U ON O FF
11 SFB
– To enable sufficient convection, we rec- ommend a minimum vertical spacing of 50 mm from other devices. Lateral spac- ing of 5 mm, or 15 mm for active compo- nents, must be observed in order to ensure correct device function of the DC/ DC converter. – The housing can become very hot de- pending on the ambient temperature and load of the DC/DC converter. The device can be snapped onto all DIN rails in accordance with EN 60715 and should be mounted in the normal mounting position (connection terminal blocks on top and bot- tom). 14 _ OKDC IN 19.2VU IN> Output D C 48V 5A Boost DC OK 30-56 V U <19.2 V IN Input D C 24V QUINT P OWER 19.2V >IN U
104793_en_01 PHOENIX CONTACT 10
9 Dimensions and mounting positions
Possible mounting positions: Normal mounting position, installation depth 125 mm (+ DIN rail) (delivery state) Rotated mounting position, 270° Y-axis, installation depth: 51 mm (+ DIN rail) 1225 5 Output DC 48V 5A Boost DC OK 30-56 V U <19.2 VIN Input DC 24V QUINT P OWER 13 14 19.2V >INU
104793_en_01 PHOENIX CONTACT 11
10 Mounting on DIN rails
Assembly: Position the module with the DIN rail guide on the upper edge of the DIN rail, and snap it in with a downward motion. Removing: Pull the snap lever open with the aid of a screwdriver and slide the module out at the lower edge of the DIN rail.
10.1 Rotated mounting position (270° Y-axis)
A rotated mounting position can be achieved by mounting the module onto the DIN rail at a 270° angle. Mount the DIN rail adapter (UTA 107/30) as shown in the figure. No addi- tional assembly material is required. Mounting screws: Figure 5 Rotated mounting position (270° Y-axis)
11 Input
Connection to the input voltage is established via the screw connectors on the DC input screw connection. The DC/DC converter converts a DC voltage of 18 ... 32 V into adjustable, regulated, and electrically isolated output voltage. The DC/DC converter requires an input voltage of 18 V. Dur- ing operation, this can drop down to 14 V, then observe de- rating. Figure 6 Input
11.1 Protection of the primary side
Device installation must be carried out according to the reg- ulations in EN 60950. For device protection, there is an internal fuse. Additional device protection is not necessary. An internal fuse is provided for device protection. Additional device protection is not required. The connecting cables on the primary side should have large cross sections to keep the voltage drops in the cables as low as possible. Other mounting positions are also possible. Always observe position-dependent derating. A B B A NOTE: Module can become damaged If an internal fuse is triggered, there is a device malfunction. In this case, the device must be inspected in the factory. 14 _ OKDC IN OKO IN Output D C 48V 5A Boost DC OK U <19.2 V IN Input D C 24V QUINT P OWER 19.2V >IN U 30-56 V
104793_en_01 PHOENIX CONTACT 12
12 Output
Connection of the output voltage is established via the screw connectors on the DC output screw connection. The output voltage can be set on the potentiometer. Figure 7 Output
12.1 Protecting the secondary side
The device is electronically short-circuit-proof and idling- proof. In the event of an error, the output voltage is limited. It must be ensured that all output cables are dimensioned or separately protected according to the maximum output cur- rent. The connecting cables on the secondary side should have large cross sections to keep the voltage drops in the cables as low as possible.
13 Output characteristic curve
The device functions according to U/I characteristic curve with static POWER BOOST power reserve shown in the il- lustration. At ambient temperatures of less than 40°C, the I BOOST is even permanently available. It is also available at higher temperatures for several minutes. In the event of a secondary-side short circuit or overload, the output current is limited to IBOOST. In this case, the device does not switch off but supplies output current continuously. The secondary voltage is then reduced until the short circuit is eliminated. The U/I characteristic curve with the POWER BOOST power reserve ensures that high inrush currents of capacitive loads in the primary circuit can be supplied. Figure 8 Output characteristic curve N = 48 V –I N = 5 A –I BOOST = 6.25 A – SFB Technology = 30 A (for 12 ms) –P N = 240 W –P BOOST = 300 W 14 _ OK DC IN OK O IN Output DC 48V 5A Boost DC OK U <19.2 V IN Input DC 24V QUINT P OWER 13 14 19.2V >IN U 30-56 V I [A]OUT U [V] OUT UN IN I<I N <60 °C U <0 ,9 x UN I>I N <40° C IBOOST
104793_en_01 PHOENIX CONTACT 13
14 SFB technology
SFB (Selective Fuse Breaking) technology reliably switches off faulty current paths in the event of a short circuit. In this case, it supplies up to six times the nominal current for 12 ms. SFB technology therefore reliably triggers standard cir- cuit breakers. Faults are located reliably and important sys- tem parts remain in operation.
14.1 Circuit breaker tripping characteristics
Typically, a circuit breaker trips within 3 ... 5 ms. Fast enough to avoid voltage drops of parallel connected loads. Figure 9 Quick tripping of circuit breakers with SFB technology
14.2 Installation notes
To use the SFB technology of the QUINT DC/DC converter, you must observe the following requirements: – When designing the secondary side, consider the con- figuration matrix that describes the maximum cable lengths depending on the performance class of the de- vices, cable cross section, and the circuit breaker. – Make sure that the source to be supplied is able to de- liver a corresponding current pulse to supply the DC/DC converter. For example, this can be achieved by up- stream connection of a QUINT SFB power supply (see accessories) or suitable battery capacity. – Ensure the lowest possible cable impedance at the in- put of the DC/DC converter by using short cable lengths and large cable cross sections.
14.3 Deactivating SFB technology
The DC/DC converter is equipped with an additional SFB switch which can be used to deactivate SFB technology. The SFB switch is located on the top side of the housing and is accessible for suitable tools, such as a small screwdriver through the vents. Figure 10 Position of the SFB switch The current configuration matrix can be found in the product download area. Observe the maximum distance between the source to be supplied and the DC/DC convert- er. (see also SFB configuration) t I [A] 6x IN IBOOST IN 3-5 ms If conditions cannot be observed, SFB tech- nology can be deactivated. Switch position SFB technology status left ON (defau lt setting) right OFF Activating/deactivating SFB technology must only be performed when the DC/DC converter is switched off. 14 _ OK DC IN 19.2VU IN> Output D C 48V 5A Boost DC OK 30-56 V U <19.2 V IN Input D C 24V QUINT P OWER 19.2V >IN U ON O FF SFB
104793_en_01 PHOENIX CONTACT 14
14.4 SFB configuration
Maximum distance from the source to be supplied and the DC/DC converter (l1) Maximum distance from the source to be supplied and the load (l2) The following parameters are the basis for calculation: – Circuit breaker from Siemens, B and C characteristics – B characteristic: electromagnetic tripping of the circuit breaker at the latest at (5-fold rated current) x (correc- tion factor 1.2 at 0 Hz) = 6-fold rated current – C characteristic: electromagnetic tripping of the circuit breaker at the latest at (10-fold rated current) x (correc- tion factor 1.2 at 0 Hz) = 12-fold rated current – Ambient temperature: +20 °C – The internal resistances of the circuit breakers are con- sidered. – In addition to short circuit current, the relevant power supply unit supplies half of the nominal current for paths connected in parallel. l1 l2 Supplying Source Load DC/DC Converters Source to be supplied: QUINT-PS/xAC/24DC/20 Cross section [2mm] 0.75 1.0 1.5 2.5 Distance l1 [m] 7.6 10.1 15.2 25.4 Source to be supplied: battery, 24 V; 3.4 Ah Cross section [2mm] 0.75 1.0 1.5 2.5 Distance l1 [m] 5.4 7.2 10.9 18.1 Source to be supplied: battery, 24 V; 7.2 Ah Cross section [2mm] 0.75 1.0 1.5 2.5 Distance l1 [m] 7.6 10.1 15.2 25.4 Source to be supplied: battery, 24 V; 12 Ah Cross section [2mm] 0.75 1.0 1.5 2.5 Distance l1 [m] 6,5 8.7 13,1 21,75 Source to be supplied: battery, 24 V; 38 Ah Cross section [2mm] 0.75 1.0 1.5 2.5 Distance l1 [m] 7.6 10,15 15,25 25,40 Cross section [2mm] 0.75 1.0 1.50 2.50 Distance l2 with C2 circuit breaker [m] 17 23 35 58
104793_en_01 PHOENIX CONTACT 15
15 Signaling
The active DC OK signal output, active POWER BOOST signal output and the active UIN OK signal output are avail- able for function monitoring. In addition, the DC OK LED, BOOST LED and the UIN < 19.2 V LED enable the evalua- tion of the power supply directly at the local site. Figure 12 Signal outputs Due to permanent monitoring of input voltage, output volt- age and output current, critical operating states are reported before errors occur.
15.1 Active switching output “DC OK”
In normal operation of the power supply unit, the DC output signal (UOUT > 0.9 x UN ) is between the "DC OK" and "-" connection terminal blocks and can be loaded with a maxi- mum of 20 mA. The DC OK signal output switches from "ac- tive high" to "low" when there is a drop of output voltage of more than 10%. The DC OK signal is decoupled from the power output. This makes it impossible for devices connected in parallel to act as an external power supply.
15.2 Active switching output “I < I
During normal operation, the boost output signal of the cur- rent supply (I < IN) is between the "I < IN" and "-" connection terminal blocks and can be loaded with a maximum of 20 mA. The boost signal output switches from "active high" to "low" when the nominal current is exceeded and switched over to boost mode. I < IN I > IN U < 0.9 x UN DC OK LED, green Lit Lit Flashing Boost LED, yel- low OFF Lit Lit "DC OK" active switching output high high low "I < IN" active switching output high low low DC OK 13/14 relay contact closed closed opened Meaning Normal operation Power Boost ac- tive Overload UIN > 19.2 V DC UIN < 19.2 V DC "UIN < 19.2 V" LED, yellow OFF Lit "UIN OK" active switching output high low Meaning U IN OK U IN low 14 _ OK DC IN OK O IN Output DC 48V 5A Boost DC OK U <19.2 V IN Input DC 24V QUINT P OWER 13 14 19.2V >IN U 30-56 V 18 ... 24 V DC 20 mA DC OK PLC Digital Input 18 ... 24 V DC 20 mA I<I N PLC Digital Input
104793_en_01 PHOENIX CONTACT 16 15.3 Active switching output “U IN > 19.2 V” During normal operation of the DC/DC converter, the UIN > 19.2 V output signal is between connection terminal blocks "UIN > 19.2 V” and “-” and can carry a maximum of 20 mA. The UIN > 19.2 V signal output indicates a low input voltage by switching from “active high” to “low”.
15.4 Floating relay contact “DC OK” 13/14
The floating relay contact is located between connection ter- minal blocks 13 and 14 and can be loaded with max. 100 mA at max. 30 V AC/DC. The relay contact signal- izes a drop of output voltage of more than 10% by opening the N/O contact. The relay contact is decoupled from the power output. This makes it impossible for devices connected in parallel to act as an external power supply.
16 Derating
16.1 Temperature-dependent derating
With an ambient temperature of up to +40°C, the device supplies the continuous output current of IBOOST. The de- vice can supply a nominal output current of IN with ambient temperatures of up to +60°C. In the case of ambient temper- atures above +60°C, the output current must be reduced by 2.5% per Kelvin increase in temperature. The device does not switch off at ambient temperatures of +70°C or thermal overload. The output capacity is reduced as far as neces- sary to provide device protection. After it has cooled down, the output capacity is increased again.
16.2 Voltage-dependent derating
The nominal input voltage of 24 V DC is divided into the areas of starting and operation. The DC/DC converter re- quires at least 18 V DC for cold starting, whereby the input voltage can sink to 14 V DC during operation. The device only switches off under this limit. The upper voltage limit is 32 V DC for both starting and operation.
16.3 Position-dep endent derating
The power supply units can be snapped onto all DIN rails ac- cording to EN 50022-35. It should be mounted horizontally (with the input terminals facing downwards). When installing in a different position, derating should be adhered to. 18 ... 24 V DC 20 mA U >19,2V IN PLC Digital Input max. 30 V AC/DC 100 mA 13 14 PLC Digital Input -25 40 6020 IBOOST IN Ambient temperature [°C] Output curren t [A] 100% 125% 14 15 16 17 18 [U /V]IN [I /A] OUT = 12 VUOUT U = 13 VOUT U = 14 VOUT -25 ℃ ... 40℃ 40 ℃ ... 60 ℃
104793_en_01 17PHOENIX CONTACT GmbH & Co. KG • 32823 Blomberg • Germany www.phoenixcontact.com
17 Other operating modes
17.1 Series operation
Figure 13 Series operation
17.2 Parallel operation
Devices of the same type can be connected in parallel to in- crease both redundancy and power. No further adjustments are necessary for the default setting. To ensure symmetrical load distribution, it is recommended that all cable connections from the power supply unit to the busbar are the same length and have the same cross sec- tion! Depending on the system, a protective circuit should be in- stalled at each individual device output (e.g., decoupling diode or DC fuse) for parallel connection of more than two power supply units. This prevents high return currents in the event of a secondary device fault.
17.3 Redundant operation
Redundant circuits are suitable for supplying systems, which place particularly high demands on operational safety. If a fault occurs in the primary circuit of the first power supply unit, the second device automatically takes over the complete power supply without interruption, and vice versa. For this purpose, the power supply units to be connected in parallel must be large enough to ensure that the total current requirements of all loads can be fully met by one power sup- ply unit. External decoupling diodes are required for 100% redundancy! Example: diode module
17.4 Increasing power
For n parallel connected devices, the output current can be increased to n x I N. Parallel connection for increasing power is used when extending existing systems. A parallel connec- tion is recommended if the power supply unit does not cover the current consumption of the most powerful load. Other- wise the loads should be divided on individual devices inde- pendent from each other. +96 V - +48 V -48 V+ -96 V IN − + IN Σ = IN IN − + IN Σ = IN IN − + IN Σ = 2 xI N