PULS ML50.100, ML50.109 technology data

MiniLine

1. GENERAL DESCRIPTION

A compact size, light weight, simple mounting on
the DIN-rail and the quick connect spring-clamp
terminals are what makes the MiniLine power
supplies so easy to use and installs in seconds.

A rugged electrical and mechanical design as well as
a high immunity against electrical disturbances on
the mains provides reliable output power. This offers
superior protection for equipment which is
connected to the public mains network or is exposed
to a critical industrial environment.

The MiniLine series offers output voltages from 5 to
56Vdc and a power rating of up to 100W. A DC-OK
signal allows remote diagnostics.

The supplementary MiniLine decoupling diode
module MLY02.100 allows building of redundant
systems or to protect against back-feed voltages.

24V MiniLine

Related products

power

For other output voltages or
output power see catalog

Less

ML50.100

Screw

terminals

Conformal

coating

Parallel use

option

More

power

380-480V

input

ML50.111

ML50.109

ML50.101ML30.100

ML100.100

ML100.200

ML50.100, ML50.109

24V, 2.1A, SINGLE PHASE INPUT

POWER SUPPLY

■ AC 100-240V Wide Range Input

■ NEC Class 2 Compliant

■ Adjustable Output Voltage

■ Efficiency up to 89%

■ Compact Design, Width only 45mm

■ Full Output Power Between -10°C and +60°C

■ DC-OK Signal Included

■ Large International Approval Package

■ DIN-Rail Bracket for Wall or Panel Mount Included

■ 3 Year Warranty

2. SHORT-FORM DATA

Output voltage DC 24V
Adjustment range 24-28V
Output current 2.1–1.8A 24-28V

Output power 50W

Output ripple < 50mVpp 20Hz to 20MHz
Input voltage AC 100-240V Wide Range Input
Mains frequency 50-60Hz ±6%
AC Input current typ. 0.77 / 0.44A at 120 / 230Vac
Power factor typ. 0.56 / 0.52 at 120 / 230Vac
AC Inrush current 17 / 35A typ. peak value

at 120 / 230Vac

40°C and cold start
DC Input 85-375Vdc
Efficiency typ. 88.4 / 89.0% at 120 / 230Vac
Losses typ. 6.6 / 6.2W at 120 / 230Vac
Temperature range -10°C to +70°C operational
Derating 1.3W/°C +60 to +70°C
Hold-up time typ. 35 / 190ms at 120 / 230Vac
Dimensions 45x75x91mm WxHxD

3. ORDER NUMBERS

Power Supply

ML50.100
ML50.109

Accessory MLY02.100 Decoupling /

Mar. 2007 / Rev. 1.0 DS-ML50.100-EN
All parameters are specified at 24V, 2.1A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.

Standard unit
Conformal coated unit

Redundancy module

4. MARKINGS

IND. CONT. EQ.

UL 508

NEC Class 2

&

Medical

approval

UL 60950-1

GL

Marine

Class I Div 2

EMC, LVD

1/20

ML50.100, ML50.109

24V, 2.1A, SINGLE PHASE INPUT

MiniLine

INDEX PAGE INDEX PAGE

1. General Description ............................................1

2. Short-form Data ..................................................1

3. Order Numbers....................................................1

4. Markings..............................................................1

5. AC-Input...............................................................3

6. Input Inrush Current Surge.................................4

7. DC-Input...............................................................4

8. Hold-up Time.......................................................5

9. DC-OK Output .....................................................5

10. Output .................................................................6

11. Efficiency and Power Losses................................7

12. Functional Diagram.............................................8

13. Reliability.............................................................8

14. Front Side and User Elements.............................9

15. Terminals and Wiring..........................................9

16. EMC....................................................................10

17. Environment......................................................11

18. Protection Features ...........................................11

19. Safety .................................................................12

20. Dielectric Strength ............................................12

21. Approvals.......................................................... 13

22. Fulfilled Standards............................................ 13

23. Used Substances ............................................... 13

24. Physical Dimensions and Weight..................... 14

25. Installation and Operation Instructions .......... 14

26. Accessory........................................................... 15

27. Application Notes............................................. 16

27.1. Peak Current Capability......................... 16

27.2. Back-feeding Loads................................ 16

27.3. Series Operation..................................... 17

27.4. Parallel Use to Increase Output Power . 17

27.5. Parallel Use for Redundancy.................. 17

27.6. Daisy Chaining of Outputs..................... 18

27.7. Charging of Batteries............................. 18

27.8. External Input Protection....................... 19

27.9. Inductive and Capacitive Loads ............. 19

27.10. Operation on Two Phases...................... 19

27.11. Use in a Tightly Sealed Enclosure .......... 19

27.12. Mounting Orientations.......................... 20

INTENDED USE

The power supply shall only be installed and put into operation by qualified personnel.
This power supply is designed for installation in an enclosure and is intended for the general use, such as in industrial

control, office, communication, and instrumentation equipment. Do not use this device in aircraft, trains and nuclear
equipment, where malfunctioning of the power supply may cause severe personal injury or threaten human life.

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.

AC 230V A figure displayed with the AC or DC before the value represents a nominal voltage with

standard tolerances (usually ±15%) included.
E.g.: DC 12V describes a 12V battery regardless whether it is charged (13.7V) or discharged
(10V). As long as not otherwise stated, AC 100V and AC 230V parameters are valid at 50Hz
and AC 120V parameters are valid at 60Hz mains frequency.

230Vac A figure with the unit (Vac) at the end is a momentary figure without any additional

tolerances included.

DISCLAIMER

The information presented in this document is believed to be accurate and reliable and may change without notice.
The housing is patent by PULS (US patent No US D442,923S)

No part of this document may be reproduced or utilized in any form without permission in writing from the publisher.

Mar. 2007 / Rev. 1.0 DS-ML50.100-EN
All parameters are specified at 24V, 2.1A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.

2/20

ML50.100, ML50.109

24V, 2.1A, SINGLE PHASE INPUT

MiniLine

5. AC-INPUT

AC input
AC input range
60-85Vac Full power for 200ms, no damage between 0 and 85Vac

Input frequency
Turn-on voltage typ. 65Vac Steady-state value, see Fig. 5-1
Shut-down voltage typ. 55Vac Steady-state value, see Fig. 5-1

AC 100V AC 120V AC 230V

Input current typ. 0.91A 0.77A 0.47A at 24V, 2.1A see Fig. 5-3
Power factor *) typ. 0.58 0.56 0.52 at 24V, 2.1A see Fig. 5-1
Crest factor **) typ. 3.05 3.26 3.91 at 24V, 2.1A
Start-up delay typ. 32ms 32ms 32ms See Fig. 5-2
Rise time typ. 33ms 33ms 48ms 0mF, 24V, 2.1A, see Fig. 5-2

Turn-on overshoot

*) The power factor is the ratio of the true (or real) power to the apparent power in an AC circuit.

**) The crest factor is the mathematical ratio of the peak value to RMS value of the input current waveform.

Fig. 5-1 Input voltage range Fig. 5-2 Turn-on behavior, definitions

P

OUT

full

power

for

200ms

Shut-down

60V 300Vac

input range

Turn-on

85V

Rated

nom. AC 100-240V Wide-range input, TN-, TT-, IT-Mains, see Fig. 5-1
85-264Vac Continuous operation

264-300Vac < 0.5s
nom. 50 – 60Hz ±6%

typ. 45ms 45ms 60ms 2mF, 24V, 2.1A, see Fig. 5-2
max. 400mV 400mV 400mV See Fig. 5-2

Intput
Voltage

Output
Voltage

- 5%

Start-up

delay

Rise

Time

Overshoot

264V

max.

500ms

V

IN

Fig. 5-3 Input current vs. output load Fig. 5-4 Power Factor vs. output load

Input Current, typ.

1.0A

0.8

0.6

0.4

0.2

0

0.1

a) 100Vac
b) 120Vac
c) 230Vac

0.5 0.9

Output Current

1.3

1.7

2.1A

a
b

c

Power Factor, typ.

0.65

0.6

0.55

0.5

0.45

0.4

0.1

a) 100Vac
b) 120Vac
c) 230Vac

0.5 0.9

Output Current

1.3

1.7

Mar. 2007 / Rev. 1.0 DS-ML50.100-EN
All parameters are specified at 24V, 2.1A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.

2.1A

a
b

c

3/20

ML50.100, ML50.109

24V, 2.1A, SINGLE PHASE INPUT

MiniLine

6. INPUT INRUSH CURRENT SURGE

A NTC limits the input inrush current after turn-on of the input voltage. The inrush current is input voltage and
ambient temperature dependent.

Inrush current max. 18A
typ. 14A
Inrush energy

typ. 0.3A2s 0.4A2s 1.5A2s 40°C ambient, cold start

Fig. 6-1 Input inrush current, typical behavior Fig. 6-2 Input inrush current, zoom into the first peak

Input Current

Input Voltage

AC 100V AC 120V AC 230V

23A

peak

17A

peak

48A

peak

35A

peak

40°C ambient, cold start

peak

40°C ambient, cold start

peak

Output Voltage

Input Current

Input: 230Vac
Output: 24V, 2.1A
Ambient: 40°C
Upper curve: Input current 20A / DIV
Middle curve: Input voltage 1000V / DIV
Lower curve: Output voltage 20V / DIV
Time scale: 20ms / DIV

Input: 230Vac
Output: 24V, 2.1A
Ambient: 40°C
Input current curve: 10A / DIV, 1ms / DIV
Ipeak 32.4A
The charging current into EMI suppression capacitors is
disregarded in the first microseconds after switch-on.

7. DC-INPUT

DC input nom. DC 110-290V -25%/+30%
DC input range min. 85-375Vdc Continuous operation
DC input current typ. 0.50A / 0.19A 110Vdc / 300Vdc at 24V and 2.1A
Turn-on voltage typ. 81Vdc Steady state value
Shut-down voltage typ. 58Vdc Steady state value

Fig. 7-1 Wiring for DC Input

Battery

Power Supply

+

Fuse

-

PE

L

N

AC

internal

fused

DC

+

Load

-

Instructions for DC use:

a) Use a battery or similar DC source.
b) Connect +pole to L and – pole to N.
c) Connect the PE terminal to a earth wire or

to the machine ground.

d) In case the – pole of the battery is not

connected to earth, use an appropriate fuse
to protect the N terminal.

Mar. 2007 / Rev. 1.0 DS-ML50.100-EN
All parameters are specified at 24V, 2.1A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.

4/20

A

ML50.100, ML50.109

24V, 2.1A, SINGLE PHASE INPUT

MiniLine

8. HOLD-UP TIME

AC 100V AC 120V AC 230V

Hold-up Time typ. 54ms 82ms 360ms 1.05A, 24V, see
typ. 26ms 40ms 180ms 2.1A, 24V, see Fig. 8-1

Fig. 8-1 Hold-up time vs. input voltage Fig. 8-2 Shut-down behavior, definitions

Hold-up Time

120ms

100

80

60

40

20

0

85 120 155 190 230Vac

a b c d

a) 24V 1.05A typ.
b) 24V 1.05Amin.
c) 24V 2.1A typ.
d) 24V 2.1A min.

Input Voltage

Intput
Voltage

Output
Voltage

Hold-up Time

Note: At no load, the hold-up time can be up to several seconds. The green DC-ok lamp is also on during this time.

Fig. 8-1

Zero Transition

- 5%

9. DC-OK OUTPUT

This feature monitors the output voltage, which is present on the output terminals.
The signal is a source output which can feed loads up to 30mA. Loads can be a 24V relay (Rcoil < 700Ohm), a LED or

the input of a PLC system. The relays operates or the LED is on if output voltage exceeds the threshold level. A free­wheeling diode (necessary when the load is a relay) is already included in the power supply.

Threshold value 20V +/-4%
Output current min. 30mA For typical values see
Output voltage min Vout – 1V

at 30mA

The open collector is internally linked to the positive output pole. The
DC-OK voltage is approximately the output voltage if the output voltage
is higher than the threshold level.

Fig. 9-1 DC-ok wiring diagram

Test Setup

Relay

LED

+ +

DC-ok

24-28V

MiniLi ne

- -

N

DC

ok

L

ML50

Fig. 9-2

Fig. 9-2 Output characteristic DC-OK signal

A

DC-OK Voltage

28V

24

20

16

12

8

4
0

01020

+

+

-

-

DC
OK

Load

V

DC-OK Current

25155 30 35

40m

Mar. 2007 / Rev. 1.0 DS-ML50.100-EN
All parameters are specified at 24V, 2.1A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.

5/20

A

ML50.100, ML50.109

24V, 2.1A, SINGLE PHASE INPUT

MiniLine

10. OUTPUT

Output voltage
Adjustment range
max. 30V At clockwise end position of potentiometer
Factory setting
Line regulation
Load regulation max. 100mV Static value, 0A Æ 2.1A Æ 0A
Ripple and noise voltage
Output capacitance typ. 1600µF
Output current nom. 2.1A At 24V, see Fig. 10-1
nom. 1.8A
Output power nom. 50W
Short-circuit current min. 3.1A Load impedance 400mOhm, see Fig. 10-1
max. 5A Load impedance 400mOhm, see Fig. 10-1

Fig. 10-1 Output voltage vs. output current,

230Vac, typ.

nom. 24V
min. 24-28V Guaranteed

24.5V

±0.2%, at full load, cold unit

max. 10mV 85 to 264Vac

max. 50mVpp 20Hz to 20MHz, 50Ohm

At 28V, see

Fig. 10-1

Output Voltage

28V

24

20

16

12

8

4
0

012

Output Current

Adjustment

Range

2.51.50.5 33.5

4

Peak current capability (up to several ms)

The power supply can deliver a peak current which is higher than the specified short term current. This helps to start
current demanding loads or to safely operate subsequent circuit breakers.

The extra current is supplied by the output capacitors inside the power supply. During this event, the capacitors will
be discharged and cause a voltage dip on the output. Detailed curves can be found in chapter 27.1.

Peak current voltage dips
typ. from 24V to 15V

typ. from 24V to 16V at 4.2A for 50ms, resistive load

at 10.5A for 2ms, resistive load

typ. from 24V to 10.5V

at 10.5A for 5ms, resistive load

Mar. 2007 / Rev. 1.0 DS-ML50.100-EN
All parameters are specified at 24V, 2.1A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.

6/20

A

A

c

c

ML50.100, ML50.109

24V, 2.1A, SINGLE PHASE INPUT

MiniLine

11. EFFICIENCY AND POWER LOSSES

AC 100V AC 120V AC 230V

Efficiency typ. 87.5% 88.4% 89.0% 2.1A, 24V
Power losses typ. 0.6W 0.7W 1.3W 0A
typ. 4.0W 4.1W 4.4W 1.05A, 24V
typ. 7.2W 6.6W 6.2W 2.1A, 24V

Fig. 11-1 Efficiency vs. output current at 24V Fig. 11-2 Losses vs. output current at 24V

Efficiency

90%

88
86
84
82
80
78
76
74

0.3

b
a

c

Output Current

0.9 1.2 1.8

0.6 1.5

a) 100Vac
b) 120Vac
c) 230Vac

2.1

Power Losses

8W

a) 100Vac

7

b) 120Vac
c) 230Vac

6
5
4
3
2
1
0

c
b

a

00.3 2.1

0.6 0.9 1.2

Fig. 11-3 Efficiency vs. input voltage, 24V, 2.1A Fig. 11-4 Losses vs. input voltage, 24V, 2.1A

Efficiency

91%

90

89

88

87

86

85

85 120 155 190 225 260

Input Voltage

Va

Power Losses

9W

8

7

6

5

85 120 155 190 225 260

Output Current

Input Voltage

1.5 1.8

a

b

c

Va

Mar. 2007 / Rev. 1.0 DS-ML50.100-EN
All parameters are specified at 24V, 2.1A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.

7/20

MiniLine

12. FUNCTIONAL DIAGRAM

Fig. 12-1 Functional diagram

L

N

Input Fuse
&
Input Filter

Input
Rectifier
&
Inrush
Limiter

Converter

Output Over-

Voltage

Protection

Power

ML50.100, ML50.109

24V, 2.1A, SINGLE PHASE INPUT

DC
ok

+

Output

Filter

DC-OK

Transistor

Signal

Output

Voltage

Regulator

+

-

-

DC-ok
Signal

V

OUT

13. RELIABILITY

These units are extremely reliable and use only the highest quality materials. The number of critical components such
as electrolytic capacitors has been reduced.

AC 100V AC 120V AC 230V

Lifetime expectancy min. 34 000h 44 000h 54 000h 40°C, 24V, 2.1A
min. 112 000h 117 000h 111 000h 40°C, 24V, 1.05A
min. 96 000h 125 000h 152 000h 25°C, 24V, 2.1A
MTBF SN 29500, IEC 61709 2 383 000h 2 456 000h 2 613 000h 40°C, 24V, 2.1A
3 977 000h 4 100 000h 4 362 000h 25°C, 24V, 2.1A
MTBF MIL HDBK 217F 1 021 000h 1 053 000h 1 120 000h 40°C, 24V, 2.1A, Ground Benign GB40
1 370 000h 1 413 000h 1 503 000h 25°C, 24V, 2.1A, Ground Benign GB25

The Lifetime expectancy shown in the table indicates the operating hours (service life) and is determined by the
lifetime expectancy of the built-in electrolytic capacitors.

Lifetime expectancy is specified in operational hours. Lifetime expectancy is calculated according to the capacitor’s
manufacturer specification. The prediction model allows a calculation of up to 15 years from date of shipment.

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.

Mar. 2007 / Rev. 1.0 DS-ML50.100-EN
All parameters are specified at 24V, 2.1A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.

8/20

MiniLine

14. FRONT SIDE AND USER ELEMENTS

DC-OK LED (green)
On when the voltage at the

output terminals is > 20 V
DC-OK LED and DC-OK signal

functions are synchronized

Output Voltage
Potentiometer

Turn to set the output voltage.
Factory set: 24.5V

Input Terminals

Spring-clamp terminals

N … Neutral input
L … Line (hot) input

... PE (Protective Earth) input

Fig. 14-1 Front side

ML50.100, ML50.109

24V, 2.1A, SINGLE PHASE INPUT

Output & Signal Terminals

Spring-clamp terminals
Dual terminals per pole

+ Positive output

- Negative (return) output

Dual pins per pole
DC-OK Open collector output
Indicates an output
voltage higher than
20Vdc

15. TERMINALS AND WIRING

All terminals are easy to access when mounted on the panel. Input and output terminals are separated from each
other (input below, output above) to help in error-free wiring. Mounting and wiring do not require any screwdriver.

Type Quick-connect spring-clamp terminals
Solid wire 0.3-4mm2
Stranded wire 0.3-2.5mm2
American wire gauge 26-12 AWG
Ferrules Allowed, but not required
Wire stripping length 6mm / 0.25inch

Pull-out force 12AWG:60N, 14AWG:50N, 16AWG:40N

Fig. 15-1 Connecting a wire

(according to UL486E)

Instructions:

a) Use appropriate copper cables
b) Follow local and national installation codes and

regulations!

c) Ensure that all strands of a stranded wire enter

the terminal connection!

d) Do not use the unit without PE connection.

Mar. 2007 / Rev. 1.0 DS-ML50.100-EN
All parameters are specified at 24V, 2.1A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.

9/20

ML50.100, ML50.109

24V, 2.1A, SINGLE PHASE INPUT

MiniLine

16. EMC

The CE mark indicates conformance with EMC guideline 89/336/EEC, 93/68/EEC and the low-voltage directive (LVD)
73/23/EWG. A detailed EMC Report is available on request.

EMC Immunity

Electrostatic discharge EN 61000-4-2 Contact discharge

Electromagnetic RF field EN 61000-4-3 80MHz-1GHz 10V/m Criterion A

Fast transients (Burst) EN 61000-4-4 Input lines

Surge voltage on input EN 61000-4-5 L Æ N

Surge voltage on output EN 61000-4-5 + Æ -

Conducted disturbance EN 61000-4-6 0,15-80MHz 10V Criterion A

Mains voltage dips EN 61000-4-11 0% of 100Vac

Voltage interruptions EN 61000-4-11 0Vac, 5000ms Criterion C
Input voltage swells PULS internal standard 300Vac, 500ms Criterion A

Powerful transients VDE 0160 over entire load

Criterions:

A: Power supply shows normal operation behavior within the defined limits.
C: Temporary loss of function is possible. Power supply might shut-down and restarts by itself. No damages or hazards to the power

supply will occur.

EMC Emission

Conducted emission EN 55011, EN 55022, FCC Part 15, CISPR 11, CISPR 22 Class B, input lines
EN 55022 Class B, output lines
Radiated emission EN 55011, EN 55022 Class B
Harmonic input current EN 61000-3-2 Fulfilled
Voltage fluctuations, flicker EN 61000-3-3 Fulfilled

This device complies with FCC Part 15 rules.
Operation is subjected to the 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

EN 61000-6-2, EN 61000-6-1

Air discharge

Output lines

N / L Æ PE

+ / - Æ PE

40% of 100Vac
70% of 100Vac
0% of 200Vac
40% of 200Vac
70% of 200Vac

range

EN 61000-6-3, EN 61000-6-4 Generic standards

variable, typ. 100kHz, (60-275kHz) Input voltage and output load dependent

Generic standards
8kV

8kV

4kV
2kV

2kV
4kV

500V
500V

0Vac, 20ms
40Vac, 200ms
70Vac, 500ms
0Vac, 20ms
80Vac, 200ms
140Vac, 500ms

750V, 1.3ms Criterion A

Criterion A
Criterion A

Criterion A
Criterion A

Criterion A
Criterion A

Criterion A
Criterion A

Criterion A
Criterion C
Criterion A
Criterion A
Criterion A
Criterion A

Mar. 2007 / Rev. 1.0 DS-ML50.100-EN
All parameters are specified at 24V, 2.1A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.

10/20

C

ML50.100, ML50.109

24V, 2.1A, SINGLE PHASE INPUT

MiniLine

17. ENVIRONMENT

Operational temperature -10°C to +70°C (14°F to 158°F) Reduce output power according to
Output de-rating 1.3W/°C 60-70°C (140°F to 158°F), see
Storage temperature -40 to +85°C (-40°F to 185°F) Storage and transportation

Humidity 5 to 95% r.H. IEC 60068-2-30

Vibration sinusoidal 2-17.8Hz: ±1.6mm; 17.8-500Hz: 2g

Shock 20g 6ms, 10g 11ms

2 hours / axis

3 bumps / direction, 18 bumps in total

Do not energize while condensation is present

IEC 60068-2-6

IEC 60068-2-27

Altitude 0 to 6000m (0 to 20000ft) Reduce output power or ambient

temperature above 2000m sea level.
Output de-rating (for altitude) 3W/1000m or 5°C/1000m Above 2000m (6500ft), see Fig. 17-2
Over-voltage category III EN 50178, IEC 62103 altitudes < 2000m
II Altitudes from 2000m to 6000m
Degree of pollution 2 EN 50178, IEC 62103, non conductive

Fig. 17-1 Output current vs. ambient temp. Fig. 17-2 Output current vs. altitude, 24V

Allowable Output
Current at 24V

2.4A

2.0

1.6

1.2

0.8

0.4

0

-10 0 20 40

Ambient Temperature

60

70°

Allowable Output
Current at 24V

2.4A

2.0

1.6

1.2

0.8

0.4

.

A

.

a

.

T

b

m

<

B

.

.

.

C

.

0

0 2000 4000

6

.

a

T

b

m

5

<

.

a

T

b

m

4

<

C

B

A

C

°

0

C

°

0

C

°

0

Altitude

6000m

The ambient temperature is defined 2cm below the unit.

Fig. 17-1

Fig. 17-1

18. PROTECTION FEATURES

Output protection Electronically protected against overload, no-load and short-circuits
Output over-voltage protection typ. 36V

max. 39V

Output over-current protection electronically limited see Fig. 10-1
Degree of protection IP 20 EN/IEC 60529
Penetration protection > 2.5mm in diameter E.g. screws, small parts
Over-temperature protection not included
Input transient protection MOV Metal Oxide Varistor
Internal input fuse T3.15A H.B.C. Not user replaceable

Note: In case of a over-voltage, overload, no-load or short-circuit event, an audible noise may be heard.

Mar. 2007 / Rev. 1.0 DS-ML50.100-EN
All parameters are specified at 24V, 2.1A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.

In case of an internal power supply fault, a redundant
circuit limits the maximum output voltage. The output
shuts down and automatically attempts to restart.

11/20

ML50.100, ML50.109

24V, 2.1A, SINGLE PHASE INPUT

MiniLine

19. SAFETY

Input / output separation SELV IEC/EN 60950-1
PELV EN 60204-1, EN 50178, IEC 62103, IEC 60364-4-41
double or reinforced insulation
Class of protection I PE (Protective Earth) connection required
Isolation resistance > 5MOhm input to output, 500Vdc
Touch current (leakage current) typ. 0.12mA 100Vac, 50Hz, TN mains
typ. 0.17mA 120Vac, 60Hz, TN mains
typ. 0.29mA 230Vac, 50Hz, TN mains
< 0.16mA 110Vac, 50Hz, TN mains
< 0.23mA 132Vac, 60Hz, TN mains
< 0.40mA 264Vac, 50Hz, TN mains

20. DIELECTRIC STRENGTH

The output voltage is floating and has no ohmic connection to ground.
To fulfill the PELV requirements according to EN60204-1 § 6.4.1, it is recommended that either the + pole, the – pole

or any other part of the output circuit should be connected to the protective earth system. This helps to avoid
situations in which a load starts unexpectedly or can not be switched off when an unnoticed earth faults occur.

Fig. 20-1 Dielectric strength

Input

L
N

A

Earth, PE

B

C

Output

-

+

DC­Ok

Type test 60s 2500Vac 3000Vac 500Vac

Factory test 5s 2500Vac 2500Vac 500Vac

Field test 5s 2000Vac 2000Vac 500Vac
Type tests and factory tests:

Conducted by the manufacturer. Do not repeat test in field!
Rules for field test:
Use appropriate test equipment which applies the voltage
with a slow ramp! Connect L and N together as well as all
output poles.

A B C

Mar. 2007 / Rev. 1.0 DS-ML50.100-EN
All parameters are specified at 24V, 2.1A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.

12/20

ML50.100, ML50.109

24V, 2.1A, SINGLE PHASE INPUT

MiniLine

21. APPROVALS

IEC 60950-1

IECEE

CB SCHEME

IEC 60601-1

IECEE

CB SCHEME

UL 508

IND. CONT. EQ.

UL2601

UL 60950-1

GL

ABS

NEC Class 2

UL 1604

The unit is suitable for use in Class I Division 2 Groups A, B, C, D locations as well as for Class I Zone 2

Marine

SEMI F47

Groups IIA, IIB and IIC locations. Substitution of components may impair suitability for Class I Division 2
environment. Do not disconnect equipment unless power has been switched off. Wiring must be in
accordance with Class I, Division 2 wiring methods of the National Electrical Code, NFPA 70, and in
accordance with other local or national codes.

CB Scheme,
Information Technology Equipment

CB Scheme,
Medical, Basic Insulation

LISTED as Industrial Control Equipment E198865

LISTED as Medical

RECOGNIZED E137006 recognized for the use in U.S.A. (UL 60950-1) and Canada
(C22.2 No. 60950). Information Technology Equipment, Level 3

Listed as Limited Power Source (LPS) in the UL 60950-1 UL report.

RECOGNIZED E246877 recognized for use in U.S.A. (UL 1604) and Canada (C22.2
No. 213-M1987) Hazardous Location Class I Div 2 T4 Groups A,B,C,D and
Class I Zone 2 Groups IIA, IIB and IIC

GL (Germanischer Lloyd) classified and ABS (American Bureau for Shipping) PDA
for marine and offshore applications. Environmental category: C, EMC2

SEMI F47-0200 Power Quality Star
Ride-through compliance for semiconductor industry.
Full SEMI range compliance (Input: 120Vac or 208Vac)

22. FULFILLED STANDARDS

EN 61558-2-17 Safety of Power Transformers

EN/IEC 60204-1 Safety of Electrical Equipment of Machines

EN/IEC 61131-2 Programmable Controllers

EN 50178, IEC 62103 Electronic Equipment in Power Installations

23. USED SUBSTANCES

Electrolytic capacitors included in this unit do not use electrolytes such as Quaternary Ammonium Salt Systems.

Plastic housings and other molded plastic materials are free of halogens, wires and cables are not PVC insulated.

The unit conforms to the RoHS directive 2002/96/EC

The materials used in our production process do not include the following toxic chemicals:
Polychlorinated Biphenyl (PCB), Pentachlorophenol (PCP), Polychlorinated naphthalene (PCN), Polybrominated
Biphenyl (PBB), Polybrominated Biphenyl Oxide (PBO), Polybrominated Diphenyl Ether (PBDE), Polychlorinated
Diphenyl Ether (PCDE), Polybrominated Diphenyl Oxide (PBDO), Cadmium, Asbestos, Mercury, Silica

Mar. 2007 / Rev. 1.0 DS-ML50.100-EN
All parameters are specified at 24V, 2.1A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.

13/20

ML50.100, ML50.109

24V, 2.1A, SINGLE PHASE INPUT

MiniLine

24. PHYSICAL DIMENSIONS AND WEIGHT

Weight 240g / 0.53lb
DIN-Rail Use 35mm DIN-rails according to EN 60715 or EN 50022 with a height of 7.5 or 15mm.

The DIN-rail height must be added to the depth (91mm) to calculate the total required
installation depth.

Electronic files with mechanical data can be downloaded at www.pulspower.com

Fig. 24-1 Front view Fig. 24-2 Side view

25. INSTALLATION AND OPERATION INSTRUCTIONS

Mounting:

Output terminal must be located on top and input terminal on the bottom. For other orientations see chapter 27.12.
An appropriate electrical and fire end-product enclosure should be considered in the end use application.

Cooling:

Convection cooled, no forced cooling required. Do not cover ventilation grill (e.g. cable conduits) by more than 30%!

Installation clearances:

25mm on top and bottom.

Risk of electrical shock, fire, personal injury or death!

Do not use the unit without proper earth connection (Protective Earth).
Turn power off before working on the power supply. Protect against inadvertent re-powering.
Make sure the wiring is correct by following all local and national codes.
Do not open, modify or repair the unit.
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.

Service parts:
The unit does not contain any service parts. The tripping of an internal fuse is caused by an internal fault. If damage
or malfunctioning should occur during operation, immediately turn power off and send unit to the factory for
inspection!

Mar. 2007 / Rev. 1.0 DS-ML50.100-EN
All parameters are specified at 24V, 2.1A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.

14/20

MiniLine

26. ACCESSORY

DIN-Rail bracket for wall or panel mount
A DIN-rail bracket is included in each shipping box.

Fig. 26-1 DIN-Rail Bracket Fig. 26-2 DIN-Rail Bracket Dimensions

ML50.100, ML50.109

24V, 2.1A, SINGLE PHASE INPUT

Hole diameter: 4.2mm

MLY02.100 Dual decoupling module 2x5A

Fig. 26-3 MLY02.100 Dual Decoupling Module

Fig. 26-4 Redundant System with Two ML50.100

PS1 ok PS2 ok

L
N

and One MLY02.100

DC

- -

+ +

ok

adj.

ML50.100

L N

II

- -

+ +

adj.

ML50.100

L N

DC

ok

+-+

VIN 1

MLY02

V

+ +

-

VIN 2

OUT

Load

- -

-

+

Mar. 2007 / Rev. 1.0 DS-ML50.100-EN
All parameters are specified at 24V, 2.1A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.

15/20

ML50.100, ML50.109

24V, 2.1A, SINGLE PHASE INPUT

MiniLine

27. APPLICATION NOTES

27.1. PEAK CURRENT CAPABILITY

Solenoids, contactors and pneumatic modules often have a steady state (sealed) 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.

Branch circuits are often protected with circuit breakers or fuses. In case of a short or an overload in the branch
circuit, the protective device (fuse, circuit breaker) needs a certain amount of over-current to trip or to blow. The
peak current capability ensures the safe operation of subsequent circuit breakers.

Assuming the input voltage is turned on before such an event, the built-in large sized output capacitors inside the
power supply can deliver extra current. Discharging this capacitor causes a voltage dip on the output. The following
two examples show typical voltage dips:

Fig. 27-1 Peak load 4.2A for 50ms, typ. Fig. 27-2 Peak load 10.5A for 5ms, typ.

24.0V

Output
Voltage

24.0V

t

u

p

t

u

e

g

O

o

V

10.5V

Output
Current

a

t

l

4.2A

0A

10ms/DIV

Peak load 4.2A (resistive) for 50ms

Output voltage dips from 24V to 16V.

16V

Output
Current

10.5A

0A

Peak load 10.5A (resistive) for 5ms

Output voltage dips from 24V to 10.5V.

1ms/DIV

27.2. BACK-FEEDING LOADS

Loads such as decelerating motors and inductors can feed voltage back to the power supply. This feature is also called
return voltage immunity or resistance against Back- E.M.F. (E

This power supply 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 maximum allowed feed back voltage is 35Vdc. The absorbing energy can be calculated according to the built-in
large sized output capacitor which is specified in chapter 10.

lectro Magnetic Force).

Mar. 2007 / Rev. 1.0 DS-ML50.100-EN
All parameters are specified at 24V, 2.1A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.

16/20

MiniLine

27.3. SERIES OPERATION

The power supply can be put in series to increase the output voltage.

Fig. 27-3 Schematic for series operation

Unit A

AC

Unit B

AC

DC

DC

+

-

+

-

+

Load

-

Earth

Instructions for use in series:

a) It is possible to connect as many units in series as needed,

providing the sum of the output voltage does not exceed
150Vdc.

b) Voltages with a potential above 60Vdc are not SELV any

more and can be dangerous. Such voltages must be installed

with a protection against touching.
c) For serial operation use power supplies of the same type.
d) Earthing of the output is required when the sum of the

output voltage is above 60Vdc.

Note: Avoid return voltage (e.g. from a decelerating motor or
battery) which is applied to the output terminals.

ML50.100, ML50.109

24V, 2.1A, SINGLE PHASE INPUT

27.4. PARALLEL USE TO INCREASE OUTPUT POWER

Several power supplies can be paralleled to increase the output power. The ML50.100 has no feature included which
balances the load current between the power supplies. Usually the power supply with the higher adjusted output
voltage draws current until it goes into current limitation. This means no harm to this power supply as long as the
ambient temperature stays below 50°C. If a current sharing feature is required, choose the ML50.101 or ML50.111.

Fig. 27-4 Schematic for parallel operation

Unit A

AC

AC

Unit B

DC

DC

+

­+

Load

+

-

-

Instructions for parallel use:

a) Use only power supplies from the same series (ML-Series).
b) Adjust the output voltages of all power supplies to

approximately the same value (±200mV).

c) A fuse (or diode) on the output is only required if more than

three units are connected in parallel.

d) Do not load terminals with more than 13A. Follow wiring

instructions according to chapter 27.6

e) Ensure that the ambient temperature of the power supply

does not exceed 50°C.

27.5. PARALLEL USE FOR REDUNDANCY

Power supplies can be paralleled for redundancy to gain a higher system reliability. Redundant systems require a
certain amount of extra power to support the load in case one power supply unit fails. The simplest way is to put two
MiniLine power supplies in parallel. This is called a 1+1 redundancy. In case one power supply unit fails, the other one
is automatically able to support the load current without any interruption. Redundant systems for a higher power
demand are usually built in a N+1 method. E.g. Five power supplies, each rated for 2.1A are paralleled to build a 8A
redundant system. If one unit fails, the 8A can still be drawn.

Mar. 2007 / Rev. 1.0 DS-ML50.100-EN
All parameters are specified at 24V, 2.1A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.

17/20

ML50.100, ML50.109

24V, 2.1A, SINGLE PHASE INPUT

MiniLine

Please note: This simple way to build a redundant system has two major disadvantages:

- The faulty power supply can not be recognized. The green LED will still be on since it is reverse-powered from
the other power supply.

- It does not cover failures such as an internal short circuit in the secondary side of the power supply. In such a
situation the defective unit becomes a load for the other power supplies and the output voltage can not be
maintained any more.

This above conditions can be avoided by utilizing decoupling diodes which are included in the decoupling module
MLY02.100.

Other recommendations for building redundant power systems:
a) Use separate input fuses for each power supply.
b) Monitor the individual power supply units. A DC-ok output is included in the ML50.100, ML50.101 and

ML50.111. In all other cases, use the redundancy module YRM2.DIODE which has a monitoring circuit for each
input included.

c) When possible, connect each power supply to different phases of the mains network.

27.6. DAISY CHAINING OF OUTPUTS

Daisy chaining (jumping from one power supply output to the next) is allowed as long as the maximum current
through one terminal pin does not exceed 13A. If the current is higher, use a separate distribution terminal block.

Fig. 27-5 Daisy chaining of outputs

max 13A!

Fig. 27-6 Using distribution terminals

+ +

Output

- -

+ +

Output

- -

Power
Supply

Input

Power

Supply

Input

+

Load

-

+ +

Output

- -

Power

Supply

Input

+ +

- -

Output

Power

Supply

Input

+

Load

Distribution
Terminals

-

27.7. CHARGING OF BATTERIES

The power supply can be used for float-charging of lead-acid or maintenance free 24V VRLA batteries.

Instructions for charging batteries:

a) Ensure that the ambient temperature of the power supply does not exceed 50°C.
b) Set the output voltage on a disconnected load, very precisely to the end-of-charge voltage according to the

expected battery temperature.

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 4A or 6A circuit breaker (or blocking diode ) between the power supply and the battery.
d) Ensure that the output current of the power supply 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 power supply is typ. 10.7mA at 25Vdc when the power supply is switched off (except in

case a blocking diode is utilized).

Mar. 2007 / Rev. 1.0 DS-ML50.100-EN
All parameters are specified at 24V, 2.1A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.

18/20

ML50.100, ML50.109

24V, 2.1A, SINGLE PHASE INPUT

MiniLine

27.8. EXTERNAL INPUT PROTECTION

The unit is tested and approved for branch circuits up to 15A (UL) or 16A (IEC). External protection is only required if
the supplying branch has an ampacity greater than this. In some countries local regulations might apply so check local
codes and requirements.

If an external protective device is utilized, a minimum value is required to avoid undesired tripping of the fuse.

B-Characteristic C-Characteristic

Ampacity max.

min.

15A (UL), 16A (IEC) 15A (UL), 16A (IEC)

10A 6A

27.9. INDUCTIVE AND CAPACITIVE LOADS

The unit is designed to supply any type of load, including unlimited capacitive and inductive loads.

27.10. OPERATION ON TWO PHASES

Fig. 27-7 Schematic for two phase operation

L1

L3

L2

max.

+10%

240V

Fuse

Power Supply

AC

internal

fuse

L

N

PE

DC

Instructions for two phase operation:
a) A phase to phase connection is allowed as long as the

supplying voltage is below 240V

b) Use a fuse or a circuit breaker to protect the N input. The

N input is internally not protected and is in this case
connected to a hot wire.

Appropriate fuses or circuit breakers are specified in section 27.6
“External Input Protection”.

+10%

.

27.11. USE IN A TIGHTLY SEALED ENCLOSURE

When the power supply is installed in a tightly sealed enclosure, the temperature inside the enclosure will be higher
than the outside. The inside temperature defines the ambient temperature for the power supply.

Results from such an installation:
Power supply is placed in the middle of the box, no other heat producing equipment inside the box
Enclosure: Rittal Type IP66 Box PK 9510 100, plastic, 130x130x75mm

Input: 230Vac

Load: 24V, 2.1A
Temperature inside the box: 40.8°C (in the middle of the right side of the power supply with a distance of 1cm)
Temperature outside the box: 21.9°C
Temperature rise: 18.9K

Load: 24V, 1.7A
Temperature inside the box: 38.7°C (in the middle of the right side of the power supply with a distance of 1cm)
Temperature outside the box: 21.7°C
Temperature rise: 17.0K

; load is placed outside the box

; (=80%) load is placed outside the box

Mar. 2007 / Rev. 1.0 DS-ML50.100-EN
All parameters are specified at 24V, 2.1A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.

19/20

C

C

C

C

C

ML50.100, ML50.109

24V, 2.1A, SINGLE PHASE INPUT

MiniLine

27.12. MOUNTING ORIENTATIONS

Mounting orientations other than input terminals on the bottom and output on the top requires a reduction in
continuous output power or a limitation in the maximum allowed ambient temperature. The amount of reduction
influences the lifetime expectancy of the power supply. Therefore, two different derating curves for continuous
operation can be found below:

Curve A1 Recommended output power.
Curve A2 Max allowed output power (results approx. in half the lifetime expectancy of A1).

Fig. 27-8

Mounting
Orientation A

Standard
Orientation

Fig. 27-9

Mounting
Orientation B
(Upside down)

OUTPUT

Power

Supply

INPUT

INPUT

Supply

Power

OUTPUT

Fig. 27-10

Mounting
Orientation C

(Table-top
mounting)

Fig. 27-11

Mounting
Orientation D

(Horizontal cw)

Supply

INPUT

OUTPUT

Power

Fig. 27-12

Mounting
Orientation E

(Horizontal ccw)

OUTPUT

Power

INPUT

Supply

Output Power

50W

40
30
20
10

0

Ambient Temperature

10 20 30 40

Output Power

50W

40
30
20
10

0

Ambient Temperature

10 20 30 40

Output Power

50W

40
30
20
10

0

Ambient Temperature

10 20 30 40

Output Power

50W

40
30
20
10

0

Ambient Temperature

10 20 30 40

Output Power

50W

40
30
20
10

0

Ambient Temperature

10 20 30 40

50

50

50

50

50

A

1

60°

A

2

A

1

60°

A

2

A

1

60°

A

2

A

1

60°

A

2

A

1

60°

Mar. 2007 / Rev. 1.0 DS-ML50.100-EN
All parameters are specified at 24V, 2.1A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.

20/20