All-rounder with
safety
SL20.310
Data sheet
Input: 3 AC 400-500V
Output: 24-28V / 490W
Power boost up to 600W
Separate primary fuse not necessary
Switchable operating mode
(single/parallel)
• Switchable overload behaviour
options (Fuse Mode)
•
•
•
•
•
CB
scheme
IEC60950
UL508 LISTED
IND. CONT. EQ.
18 WM, 60°C
UL60950 E137006
CUL/CSA-C22.2
No 60950
Type approval
acc. to:
• IEC / EN60950
• EN50178
Overvolt. cat. III
• EN60204
EMC and
Low Volt.
Directive
Short description
This compact power supply unit is characterised by the variety of possi-
bilities of application and low system costs. The fact that the
external
fuses are no longer necessary
is an advantage as it saves cost and
space. The switchable
Fuse Mode
and the extremely comprehensive
approvals package
including EN60204 make the SL20.310 the unit of
choice.
At a competitive price, it also offers
25A power boost, output noise
suppression,
optional Single Mode or Parallel Mode, small dimen-
sions, more than
500,000h MTBF
as well as easy installation. The unit
can be connected to European and American power supply networks
without switching.
Output
Output voltage
DC 24-28V adjustable by (covered) front
panel potentiometer, preset: 24.5V ±0.5%
Adjusting range guaranteed
Output noise suppression Radiated EMI values below EN50081-1, even
Silent Switcher ™
when using long, unscreened output cables.
Ambient temperature
range T
amb
Derating
Operation: 0°C...+70°C (>60°C with Derating)
Storage: -25°C...+85°C
12W/K
(@ T
amb
= +60°C...+70°C)
Input
Nominal Input voltage
3 AC 400-500V, ±15%
47-63Hz, suitable for IT power systems
Rated continuous loading with convection cooling
• T
amb
=0°C - 60°C
24.5V/20A (490W) resp. 28V/18A (504W)
• T
amb
=0°C - 45°C
24.5V/25A (612W) resp. 28V/22A (616W)
short-term (<1 min.) also at 60°C admissible
Output is protected against short-circuit, open circuit and overload.
Voltage regulation
Ripple/Noise
Overvolt. protection
Power back immunity
Parallel operation
<2% static, jumper in ’Single Mode’ position
<30mV
PP
(< 0.1%) incl. spikes
(20MHz bandw., 50
Ω
measurement)
At 33V ±10%: switch to hiccup mode
max. 35V
Yes, up to ten SL20
Rated tolerances
• Continuous operat. AC 340...576V resp. DC 450...820V
• Please ask for 'application notes' at operation with DC input voltage.
Input current
Inrush current
3 x 1.5A
<2.5A eff. resp. <7A
pk
Unit is internally fused (fuse not accessible). For external fusing of unit
and for input line protection, use circuit breaker with B-characteristic
10A or slower action, or alternatively T10A HBC fuse.
2-phase operation: Operation is possible even if one phase fails. With
high ambient temperature or high load, P
out
is adjusted downwards.
The red LED is on. Also see Overload Behaviour (overleaf).
EN 61000-3-2 (harmonic current emissions [PFC]) is fulfilled
Transient handling
Active transient filter incorporated, so tran-
sient resistance acc. to VDE 0160 / W2
(1300V/1.3ms) for
all
load conditions.
>11ms
at 24.5V/20A, V
in
: AC 400V
To achieve current sharing:
• Plug jumper into pos. 'Output parallel use'. This alters the output V/I
characteristic to be 'softer' (25V at 2A, 24V at 20A). The output voltage
can still be adjusted.
• Missing jumper = 'Single Use', i.e. 'hard' characteristic
Front panel indicator:
• Green LED on, when V
out
= set output voltage
• Red LED on, when V
out
< set output voltage
(with overload and overtemp. as well as overload with 2-phase op.)
• Red LED flashes after switch-off in the Fuse Mode
Hold-up time
Construction / Mechanics*
Housing dimensions and Weight:
• WxHxD
150mm x 124mm x 121mm (+ DIN Rail)
• Weight
1.8kg
• Recomm. free space for conv. cool.: above/below 70mm, left/right 25mm
• All connection blocks are easy to reach as mounted at the front panel
• PVC insulated cable can be used for all connections, as the connection
blocks are mounted in the cooler area on the underside of the unit.
Order information
Order number
SL20.310
SLZ01
sl20e310 / 030709
Description
(Screw mounting set, two needed per unit)
1/2
Data sheet
Efficiency, Reliability etc.*
Efficiency
Losses
MTBF
typ. 92%
typ. 42W
(24.5V/20A, Vin
rated
)
(24.5V/20A, Vin
rated
)
Output voltage Vout [V]
Output characteristic
(typ.)
30
25
20
15
10
5
0
24.5V / Single
24.5V / Parallel
28V / Single
28V / Parallel
504.000h acc. to Siemensnorm SN 29500
(24.5V/20A, AC 400V, T
amb
= +40°C)
Life cycle (electrolytics):
The unit exclusively uses longlife electrolytics, specified for +105°C
(cf. ’The SilverLine’, p.2). High reliability and lifetime, as
• only 4 aluminum electrolytics and
• no small aluminum electrolytics are used.
Start Behaviour
Start-up delay
Rise time
typ. 0.45s
appr. 5-20ms, depending on load
0
5
10
15
20
Output current Iout [A]
25
30
diag. 1
Efficiency
(typ., @ V
out
=24V)
Overload Behaviour
Two different operating mode options, switchable by plugging the front-
panel OVL-jumper. If the jumper is missing, the unit is in the Fuse Mode.
The unit is delivered preset in Continuous Mode.
Efficiency [%]
94%
93%
92%
91%
90%
89%
88%
87%
86%
4
8
12
16
20
Output current Iout [A]
24
3 x AC 400V
3 x AC 340V
3 x AC 480V
a) Continuous Mode (continuous current):
• Jumper is in the 'OVL cont. mode' position.
• When overload or short-circuit occurs, the unit continuously supplies cur-
rent (see. diag. 1), no Hiccup.
Advantage: The unit starts reliably even with heavy, non-linear loads (high ca-
pacities, DC-DC converters, motors). The high short-circuit current triggers
downstream fuses, and allows for selective configuration of electrical instal-
lations.
b) Fuse Mode (Switch-off after typ. 4s):
• Jumper is in the 'OVL fuse mode' position.
• When overload, short-circuit or overload with 2-phase operation occurs or
in case of overtemperature for more than typ. 4s, the unit switches off the
output (residual volt. <3V without load, average short circuit current
<0.1A)
• Definition of overload or short-circuit: The set output voltage in each case
can no longer be maintained.
• The capacity to deliver current (PULS Overload Design) (see diag. 1)
remains unchanged during the typ. 4s delay time.
•
Red LED flashes
at switch-off.
Feature: With some applications, the Fuse Mode can replace the usual fusing
on the secondary side. The Fuse Mode has closer tolerances than thermal
trips. The release delay time of typ. 4s ensures that motors can be reliably
operated.
Re-start:
• by pushing the reset button on the unit’s bottom panel.
• by disconnection from mains and re-start of the unit after >1 min.
3-phase
diag. 2
Hold-up time
(min., @ V
out
=24.5V)
60
50
Hold-up time [ms]
40
30
20
10
40% load
60% load
80% load
100% load
125% load
3-phase
0
340 360 380 400 420 440 460 480 500
Input voltage VACin [V]
Overtemperature Protection
Continuous Mode
Fuse Mode
Output voltage is adjusted downwards as long as
overtemperature prevails
Unit remains switched off after overheating until re-
start (after cooling); (also see
’Re-start’
above).
diag. 3
For further information,
especially about, EMC,
Connections, Safety, Approvals, Mechanics und Mounting,
see page 2 of the „The SilverLine“ data sheet.
Unless otherwise stated, specifications are valid for AC 230V input voltage, +25°C ambient temperature, and 5 min. run-in time. They are subject to change without prior notice.
Your partner in power supply:
European
Power Supply
Manufacturers
Association
Bayerns Best 50
Czech 100 Best
Europe’s 500
PULS GmbH
Arabellastraße 15
D-81925 München
Tel.: +49 89 9278-0
Fax: +49 89 9278-199
www.puls-power.com
2/2
sl20e310 / 030709
Embedded System
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