Buffering: Electrolytic caps.
instead of accumulators
CBscheme

Data sheet

SLV20.200

IEC60950• Buffering for 24V loads• Minimum hold-up time: 0.2s/20A(max. buffer time depends on load)• Fit for industrial use: Energy storage
in electrolytic caps., no accumulators• Clear status indication by Status LEDand signalling terminals

UL508 LISTED
IND. CONT. EQ.
18 WM, 60°C

UL60950 E137006
CUL/CSA-C22.2
No 60950

EMC andLow Volt.
DirectiveShort description
The buffer unit is a supplementary device for regulated DC 24V powersupplies. It buffers load currents during typical mains faults and switching events or load peaks.
Working principle
ChargeBufferIn times when the power supply proviDC
des sufficient voltage, the buffer unit
Discharge
stores energy in integrated electrolytic
capacitors. In case of a mains voltage fault, this energy is released again
in a regulated process.
Bridges mains faults withoutACinterruption
Statistics show that 80 percent of allDCmains faults last less than 0.2s. These
Buffer unit
mains faults are completely bridged
by the buffer unit and will have noinfluence on the DC power (startup-delay of power supply used might
be taken under consideration. This increases the reliability of the system
as a whole.

Extended hold-up time
Once the main power fails or is swit- AC
ched off, the buffer unit will contiDC
nue to provide the load current for a
Buffer unit
defined period of time. Process data
can be saved and processes can beterminated before the DC power switches off. Controlled restarts aresubsequently possible.
Easy to handle, expandable andmaintenance-freeThe buffer unit does not require anycontrol wiring. It can be added parallel to the load circuit at any given
point. Any given number of buffer units can be switched parallel toincrease the output capacity or the hold-up time. The dual terminals allow for easy wiring. In addition, there is a housing connection.

Short Overview - Technical Data

Short Overview - Technical Data

Rated voltage

DC 24V

Idling input current

typ. 80mA

Voltage range

DC 24...28.8V

Power dissipation

typ. 1.9W

Buffered voltage

selectable by front jumper setting
Vin -1V: 23 - 27.8V (variable threshold)
22.5V fixed: 22.5V (fixed threshold)

Degree of protection

IP20 (EN 60529)

Dimensions (W x H x D) 64mm x 124mm x 102mm (without DIN rail)
WeightReversed power
immunitymax. +35V

Protection against
polarity reversal

max. -35V

Charging current<600mA

Buffering current

0...20A

Current limitation(Buffer operation)>20A

Charging time

18...27s (primary charge)

Hold-up time
• minimum• typical

see diagramm (page 2)0,2s (22,5V/20A) or 28s (22,5V/100mA)
0,31s (22,5V/20A) or 43s (22,5V/100mA)

740g

SafetyTerminal voltage

SELV, IEC/EN 60950

Classification

PELV (IEC364-4-41)
PELV (EN 60204)

Isolation resistance

5MOhm (terminal→housing)

Degree of protection

IP20 (EN 60529)

PELV (EN50178)

Penetration protection > 3.5 x 3.5 mm
Internal fusingnone

Galvanic isolation
to signal path

500V

Order information

slv20e200 Rev. C 040527

Order number

Description

SLV20.200
XF-1x4s/270-60
SLZ11SLZ02

DIN rail electrolytic capacitor buffer unit
Mating connector for signalling terminals (part of delivery)
Adapter for S7-300 rail
Wall mounting set (two pcs. per package)
1/4

Data sheet

SLV20.200
Hold-up time

Technical Data
Buffer Charging
Charging delay time

typ. 4s

Charging current

0.4...0.6A

Charging time

18...27s (primary charge / cold start)

Buffer Operation
Rated output current

20A

Current limitation>20A

Hold-up time
• minimum• typical

see diagramm (page 2)0,2s (22,5V/20A) or 28s (22,5V/100mA)
0,31s (22,5V/20A) or 43s (22,5V/100mA)

To increase buffer current and/or extend hold-up time any given number of buffer unit can be switched parallel(max. load per terminal = 30A)
Activation threshold“22.5V fixed”

Buffering starts if terminal voltage <22.5V,
voltage is kept at 22.5V.

“Vin -1V”

Buffering starts if terminal voltage decreases
by more than 1V, faster than typ. 0.54V/s.
Voltage is kept at that level. Buffering ends
when voltage increases once more by 1V.

100typ.
min
Buffer charging status [%]Noise (spikes)

Buffer charging time

<200mVPP (20MHz bandw., 50Ω−measurement, buffer operation only)

Over voltage protectionlimited to max. ±35V
Operation indicator

Green LED (see below table 'Operatingmodes')Environmental Data
Temperature• Storage/Transport• Operationmax.
60

4020• Derating• Cooling-25°C...+85°C-10°C...+70°C(measured at 25mm below the unit)
not necessary
natural convection

Humidity

5...95% (condensation not permissible)

Vibration• Sinus80

051015202530

Charging time [s]Operating modest• Random

2 – 17.8Hz: ±1.6mm
17.8Hz – 500Hz 2g (IEC 60068-2-6)
2...500Hz 0.5m2 (a3) (IEC 60068-2-64)

Shock

15g/6ms and 10g/11ms (IEC 60068-2-27)

Degree of pollution

2 (EN 50178)

Installation level

2.000m above sea level

VBuffer
Capacitort
Voutt'Ready'Optocoupler high ohmic
Optocoupler
low ohmictReliability'Active'

Optocoupler high ohmic
Optocoupler
low ohmic

MTBF

480.000h t.b.c.
(unit on stand-by, Tamb = +40°C)

LED>42.000h calculated life expectancy(Tamb =+40°C)
Note: t.b.c. = to be calculated(datawill follow)

1.25HzLife timet}

Charging time (typ. 20s)

Normaloperation

Hold-up time
moduleHold-up time power supply

Operating modes
CurrentTime

Status LEDOutput'Active'

Output'Ready'Bulk capacitor
array

Buffer charging

400...600mA

18-27sflashes 1.25Hz

blocking

blocking

charging

Stand-by

80mA./.

steady light

blocking

low ohmic

fully charged

Buffer operation

0...20A

see diagramm
hold-up time

flashes 10Hz

low ohmic

blocking

discharging

Inhibit mode

15mA./.

off

blocking

blocking

discharged

Unit not ready

15mA./.

off

blocking

blocking

discharged

2/4

t

10Hz

slv20e200 Rev. C 040527

SLV20.200

Data sheet

Electromagnetic Compatibility(EMC)

Connections
Terminals

Fingertouch-proof terminals with captivescrews for 5.5mm slotted screwdriver orPhilips cross-recessed screwdriver No. 2Emissions

EN 61000-6-3 (also includes EN 61000-6-4)
radiated noise and interference voltage onDC lines

Positioning

Easy to reach terminals on the front panel.
Signal connectors and powers terminals areclearly separate from each other.

Immunity• Electrostatic
Discharge (ESD)

Tightening torque

0.7Nm recommended

EN 61000-6-2 (also includes EN 61000-6-1)
EN 61000-4-2, Level 4(withstands 8kV direct discharge,
15kV air discharge; DIN rail earthed)Connector size range• solid• flexible

0.5 ... 6mm2
0.5 ... 4mm2

• Electromagnetic
radiated fields

EN 61000-4-3, Level 3 (10V/m)
ENV 50204 (10V/m)

Ferrulesadmissible• Burst, coupled to:– DCout lines

EN 61000-4-4,
Level 3 (2 kV)

Stripping length

7mm

20AWG ... 10AWG
20AWG ... 12AWG

Front Elements, Operating Indicators andElements
Positive power in/out (twice)
Negative power in/out (twice)• Surge transients
EN 61000-4-5– Differential
500V
mode
(+→housing,– → housing)
500V– Common mode(+ → –)• Conducted noiseimmunity

EN 61000-4-6,
Level 3 (10V, 150kHz - 80MHz)

Possibility to connect housing to ground

Chassis Ground'Back-up Threshold'• Jumper pos. 2-3(or missing)• Jumper pos. 1-2

LED 'Status'• OffApprovals and Declarations of Conformity
Backup voltage: DC 22.5V fixed
Backup voltage, variable: Vin -1V;
backup activation on drop faster thantyp. 0.54V/s and >1V
Buffers are discharged, no external voltage orexternal voltage <22.5V
Buffer capacitors are charging
Unit ready for operation, buffer is fullycharged
Unit is buffering• Flashes (1.25Hz)• On• Flashes (10Hz)

The unit complies with all major safety approvals:
EU (EN 60950), USA (UL 60950 recognized, UL 508 LISTED), CBscheme(IEC 60950), Canada (CAN/CSA-C22.2 No. 60950 [cUR], CAN/CSA-C22.2
No. 14 [cUL])
This unit has the following declarations of conformity:
Europe (CE acc. to EMC and low voltage directive)

Operating indicators and elements
Signalling terminals:• 7 Active: unit is buffering• 8 Ready: unit is on stand-by• 9 Inhibit: initiates buffer discharging, inhibits recharging of capacitor array6440
174Jumper back-up threshold:• Pos. 1-2: variable: Vin -1V.
Buffering if voltage decreases
faster than typ. 0.54V/s and> 1V• Pos. 2-3: DC22.5V fixed. Voltage buffering starts at Vin<22.5V124

6 +7 Active
8 Ready
9 Inhibit

Status LED
Indicicates charge statusof buffer capacitor array

Back-upThreshold

Plastic slider:
Mounting: Place the unit onto theDIN rail and push it downwards andagainst the lower front edge until it
snaps into place.
Detachment: Push downwards anddetach the unit from its DIN railmounting bracket
DIN rail mounting bracket

1-2 Vin -1V
2-3 25.5 Vdc fixed

Status24-28.8V / 20A

ChassisGroundReadyCharging
Discharging

713

Power In/Out terminals:
dual terminals• + (positive)• – (negative)• Housing connection'Chassis Ground'45

slv20e200 Rev. C 040527

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SLV20.200

Data sheet
Schematic

Signalling Terminals

10mA max. permissible

Voltage drop acrossopto coupler

0.9V/1mA...3V/5mA (while low ohmic)

Leakage current<100µA (while optocoupler blocks)

Signal input• 9 – Inhibit

Optocoupler'High' input signal initiates unit shutdown
and buffer discharge

Shutdown threshold>7...10V

Input current<4mAIsolation voltage

AC 500V against power path

Signal outputs and control input are protected against short-circuit,
open circuit and overload.

R = 3.3 kOhm

Current

LED

LED

ActiveReadyInhibit• 8 – Ready

Optocoupler
low ohmic, while buffer capacitors are discharging
low ohmic, when buffer is fully charged

BufferunitDC

R = 3.3 kOhm

Input
ACpower supplyChassis
GroundPELN+++++++SPS
0V++ + + + +Signalling output variants:• LED + R = 3.3kOhm (see above)• Relay (RL = 2kOhm)• SPS input

ACpower supplyDCPE

L

N+++++Bufferunit+++Active
ReadyInhibit

Signal outputs• 7 – Active

DC 35V max.

+Shared signal→ signal (e.g. Inhibit)++ +ON / OFF

ChassisGround+ + +Installation Notes
Mounting position

vertical; power in/out terminals below,
signal terminal above

Admissible area of application: The buffer unit SLV20.200 hasbeen designed for use in panel-board installations or other buildingin applications where a suitable mechanical enclosure shall be provided to fulfill the requirements for shock-hazard protection and/or protection from hazardous energy levels as well as for fire protection.

Unless otherwise stated, specifications are valid for 'Ready' state, DC 24V input voltage and +25°C ambient temperature. They are subject to change without prior notice.

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EuropeanPower Supply
Manufacturers
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PULS GmbH
Arabellastraße 15
D-81925 MünchenTel.: +49 89 9278-0
Fax: +49 89 9278-299
www.puls-power.com

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slv20e200 Rev. C 040527