W Series Data Sheet
125, 250 Watt AC-DC and DC-DC DIN-Rail Converters
125, 250 Watt AC-DC (DC-DC) Converters Convert Select
Features
• RoHS lead-free-solder and lead-solder-exempted
products are available
• Rugged 35 mm DIN-rail snap-fit design
• Class I equipment
• Universal AC-input or DC-input (66 – 150 or 90 – 350
VDC) with single stage conversion
• Power factor correction, harmonics IEC/EN 61000-3-2
• Virtually no inrush current
• Immunity to IEC/EN 61000-4-2, -3, -4, -5, -6, -8, -11
• Emissions according to EN 55011/022
• Very high efficiency; up to 89%
• Short-term output peak power capability, rectangular
current limiting characteristic
• Single or two independently regulated outputs with 12,
24, 36, or 48 V
• Outputs no-load, overload, and short-circuit proof
• PCBs coated by protective lacquer
• Very high reliability
138
5.43"
Safety-approved to IEC/EN 60950-1 and UL/CSA 60950-1
2
nd
Ed., UL 508 listed components
1
103
4.05"
114
4.49"
1
not EW
Description
The Convert Select front end series represents a family of
DIN-rail mountable DC-DC and AC-DC converters with power
factor correction. The converters have been designed
according to the latest industry requirements and standards.
The converters are ideal for use in outdoor and other
demanding applications to power building control systems,
factory automation, industrial controls, instrumentation,
electromagnetic drives, fans, and other DC loads. Different
models are available with a single output or two independently
regulated, electrically isolated outputs with 12, 24, 36, or 48 V.
Special models for battery charging are available. The EW
models are particularly suitable for 110 V railway applications;
they have been designed in accordance with the railway
standards EN 50155 and EN 50121.
Key features of the Convert Select line include power factor
correction with low harmonic distortion, negligibly low inrush
current, high immunity to transients and surges, and low
electromagnetic emissions. Internal protection circuits such as
input over- and undervoltage lockout, thermal protection, as
well as output overvoltage protection by a second control loop
ensure safe operation of the final system.
The outputs deliver an electrically-isolated Safety Extra Low
Voltage (SELV) and low output noise. They are no-load,
Table of Contents
Page
Page
Immunity to Environmental Conditions ................................. 16
Mechanical Data ................................................................... 17
Safety and Installation Instruction ......................................... 18
Description of Options .......................................................... 21
Accessories ........................................................................... 24
Description .......................................................................... 1
Model Selection .................................................................. 2
Functional Description ........................................................ 4
Electrical Input Data ............................................................ 6
Electrical Output Data ......................................................... 8
Electromagnetic Compatibility (EMC) ............................... 13
Copyright © 2018, Bel Power Solutions Inc. All rights reserved.
BCD20020-G Rev AE, 25-APR-2018
MELCHER
The Power Partners.
Page 1 of 25
W Series Data Sheet
125, 250 Watt AC-DC and DC-DC DIN-Rail Converters
overload, and short-circuit proof. The electronically controlled
short-term peak power capability of up to 150% of the rated
output power enables the front end converters to deliver
additional power to start-up motors or to safely operate
subsequent circuit breakers. Built-in large sized output
capacitors absorb possible reverse energy, which may be
caused by quick deceleration of electromagnetic drives
connected directly to the output. A green LED at the front cover
displays the status of the output(s).
The Convert Select Series was designed according to all
relevant international safety standards. The converters are
approved by TÜV and UL, and are UL 508 listed. Adequate
clearances and creepage distances allow operation in
pollution degree 3 environment (with AC input). All board
assemblies are coated with a protective lacquer.
The thermal concept allows operation at full load up to an
ambient temperature of 60 °C (LW models) or 70 °C (EW
models) in free air without forced cooling. A rugged DIN snap-fit
device allows easy and reliable fixing onto the various 35 mm
DIN rail models. The converters are fitted with cage clamp
terminals which are easily accessible from the front. System
connectors with screw terminals for use with pre-assembled
harnesses, external adjustment of the output voltage as well as
various auxiliary functions are available as options.
The letter E stands for improved EMC performance of LW
models. Models without E are obsolete.
Model Selection
Table 1: Standard models
Output 1
V
o1 nom1
I
o1 nom
[VDC]
[A]
12.35
12.35
24.7
24.7
37
37
49.4
49.4
12.35
24.7
37
49.4
24.7
24.7
7.5*
14*
5
10
3.3
6.6
2.5
5
7*
5
3.3
2.5
5
5
Output 2
V
o2 nom1
I
o2 nom
[VDC]
[A]
-
-
-
-
-
-
-
-
12.35
24.7
37
49.4
-
24.7
-
-
-
-
-
-
-
-
7*
5
3.3
2.5
-
5
Output Power
P
o nom
[W]
93*
173*
124
247
122
244
124
247
173*
247
244
247
120
240
66 – 150 VDC
Operating Input
Voltage
V
i min
-
V
i max
85
2
– 264 VAC,
47 – 63 Hz
4
,
90
2
– 350 VDC
7
Type
Designation
6
LWR1301-6E
3
LWN1301-6E
3
LWR1601-6E
LWN1601-6E
LWR1701-6E
LWN1701-6E
3
3
Effic.
η
min 8
[%]
83*
83*
87
87
88
88
88
88
83*
87
89
89
87
87
Options
3, 5
R
D1,
D2, D5
M1, M2
F
K2, G
LWR1801-6E
LWN1801-6E
LWN2320-6E
3
LWN2660-6E
LWN2770-6E
3
LWN2880-6E
EWR1601-0
EWN2660-0
9
9
R, M1, M2
Q, K2, G
* Version 106 or higher
1
R-input not connected.
2
For derating at low input voltage see section
Output Power Derating.
3
For minimum quantity and lead times contact the Company.
4
The converters have been tested up to 440 Hz; operation at 16
2
/ Hz is also possible, but the output ripple is slightly higher. For questions
3
when operating at frequencies <47 Hz or >63 Hz, consult the Company.
5
On double-output models the options R, M2, D1, D2, D5 are related to the second output only.
6
Improved EMC performance for LWN/LWR models. Former models without E are still available on request.
7
V
≤
250 VDC for models with option F
i
8
Min. efficiency at
V
i nom
,
I
o nom
, and
T
A
= 25 °C. Typical values are approx. 2% better.
9
EWN and EWR models are designed for railway applications according to EN 50155 and EN 50121.
NFND: Not for new designs.
Preferred for new designs
BCD20020-G Rev AE, 25-APR-2018
MELCHER
The Power Partners.
Page 2 of 25
W Series Data Sheet
125, 250 Watt AC-DC and DC-DC DIN-Rail Converters
Table 2: Battery charger models (M1 included)
V
Bat
[VDC]
12
Output Voltage
V
o safe1
V
o max
[VDC]
[VDC]
12.84
1
14.65
Nominal Output ValuesOperating InputType Designation
6
Effic.
V
o nom 5
I
o nom 5
P
o nom 5
Voltage
[VDC]
[A]
[W]
V
i min
-
V
i max
13.8
7.5 *
14*
24
36
25.68
1
38.52
1
51.36
1
29.3
43.95
27.3
40.88
4.2
8.4
2.8
5.6
48
58.6
54.5
2.1
4.2
1
Options
3
η
min 8
[%]
83*
85*
86
85
86
86
86
87
F
K2, G
104*
194*
115
230
115
230
115
230
85
2
– 264 VAC,
47 – 63 Hz
4
,
90
2
– 350 VDC
7
LWR1140-6EM1
3
LWN1140-6EM1
3
LWR1240-6EM1
LWN1240-6EM1
LWR1840-6EM1
3
LWN1840-6EM1
3
LWR1740-6EM1
LWN1740-6EM1
* Version 106 or higher
Setting voltage (typ.) with open R-input
2
For derating at low input voltage, see section
Output Power Derating.
3
For minimum quantity and lead times, contact the Company.
4
The converters have been tested up to 440 Hz; for operating frequency <47 Hz or >63 Hz consult the Company.
5
Nominal output figures, calculated with a cell voltage of 2.27 V at 20 °C.
6
Improved EMC performance. Former models without E are still available on request.
7
V
≤
250 VDC for models with option F.
i
8
Min. efficiency at
V
i nom
,
V
o nom
,
I
o nom
, and
T
A
= 25 °C. Typical values are approx. 2% better.
Part Number Description
L W N 2 6 60 -6 E D2 F K2 G
Input voltage range .......................................................... E, L
Series .................................................................................. W
Nominal output power
125 W .............................................................. R
250 W .............................................................. N
Number of outputs ............................................................ 1, 2
Type specification .................................................. 000 – 999
Operational ambient temperature range
T
A
–40 to 60 °C ................................................... -6
EW or customer-specific ........................... -0, -5
Improved EMC performance ................................................ E
Options
Output voltage control input
1 .......................................
R
Save data signal
1 ..........................................
D1,
D2, D5
Multiple functions via D-SUB connector
1 ..
M1, M2
Built-in second fuse, input diode ................. F, Q
System connector .......................................... K2
RoHS compliant for all six substances ............ G
1
Only one of these options is possible.
Note:
The sequence of options must follow the order above.
NFND: Not for new designs
Preferred for new designs.
Example:
LWN2660-6ED2FK2G: Power factor corrected AC-DC converter, operating input voltage range 85 – 264 VAC,
2 electrically isolated and individually regulated outputs, each providing 24.7 V, 5 A, improved EMC performance,
options D2, F, K2, and RoHS-compatible for all 6 substances.
BCD20020-G Rev AE, 25-APR-2018
MELCHER
The Power Partners.
Page 3 of 25
W Series Data Sheet
125, 250 Watt AC-DC and DC-DC DIN-Rail Converters
Product Marking
Basic type designation, applicable safety approval and
recognition marks, CE mark, warnings, pin designation,
company logo.
Specific type designation, input voltage range, nominal output
voltages and currents, degree of protection, batch no., serial
no., and data code including production site, version, and date
of production.
Functional Description
The W Series converters are primary controlled AC-DC or DC-
DC flyback converters with a constant switching frequency of
130 kHz. The power-factor-corrected single-step conversion of
the input voltage to a low output voltage results in extremely
high efficiency. Depending upon the output power, the
converters are fitted with one (125 W) or two (250 W)
powertrains. Models with two powertrains have one or two
outputs. Double-output models exhibit individually regulated
powertrains.
The input voltage is fed via fuse, filter, and rectifier to the main
transformer, designed in planar technique. The input filter with
very small input capacitance generates virtually no inrush
current. An input transient suppressor protects the converter
against high voltage peaks and surges. Input over- and
undervoltage lockout as well as input current limitation protect
the converter from operation outside of its specification. The
input voltage waveform is sensed by the primary control logic
to allow active power factor correction, forcing the input current
to follow the input voltage waveform.
The secondary side of the main transformer supplies via the
rectifier diode a large electrolytic output storage capacitor
providing for the hold-up time. Double-output models exhibit an
individual control logic each. The output voltage and the output
current are measured and fed back to the primary control logic
via an optocoupler. A second control loop monitors the output
voltage. It disables the output in the case of a failure in the
control logic and limits the output voltage.
Built-in temperature sensors monitor the internal temperature
of each powertrain. If the temperature exceeds the limit, the
converter reduces the output power continuously to keep the
temperature below its limit. A green LED on the front cover
confirms the presence of the output voltage(s).
The R input (option R, M1, or M2) allows for external adjustment
of the output voltage by means of a resistor or an external
voltage source. An external sensor can be connected to the R
input and allows for temperature-controlled battery charging
(see
Accessories).
03103b
L
Vi+
Fuse
3
Rectifier
1
+
Output filter
Input filter
Input filter
C
y
2
Vo+
3
6
C
Y
7
N
Vi–
Shunt
C
y
C
y
Shunt
2
4
Vo–
5
8
2
nd
fuse
(option F)
models
have a link or a
decoupling diode
(opt. Q) in the
Vi+ line.
1
EW
1
Control circuit
including
PFC and
input OVP/UVP
V
o
/I
o
control
C
Y
9
1
2
nd
control loop (SELV)
11
10
AUX
Fig. 1
Single-output converters (125 W).
BCD20020-G Rev AE, 25-APR-2018
MELCHER
The Power Partners.
Page 4 of 25
W Series Data Sheet
125, 250 Watt AC-DC and DC-DC DIN-Rail Converters
03104b
L
Vi+
Fuse
Output filter
3
Input filter
Input filter
C
y
C
y
2
3
Vo1+
Rectifier
1
+
N
Vi–
Shunt
C
y
Shunt
2
2
nd
fuse
(option F)
1
C
y
Control circuit
including
PFC and
input OVP/UVP
C
y
4
Vo1–
5
V
o
/I
o
control
2
nd
control loop
C
y
6
7
Output filter
Input filter
Vo2+
1
EW models
+
have a link or a
decoupling diode
(opt. Q) in the
Vi+ line.
Shunt
C
y
Shunt
C
y
8
9
Vo2–
Control circuit
including
PFC and
input OVP/UVP
V
o
/I
o
control
2
nd
control loop
1
11
10
AUX
Fig. 2
250 W converters.
The figure shows a double-output model.
For the pinout of 250 W single-output
models, see fig. 1 or table 13.
BCD20020-G Rev AE, 25-APR-2018
MELCHER
The Power Partners.
Page 5 of 25
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