EN
ML50.111 Installation Manual
Product Description
The ML50.111 is a DIN-rail mountable single-phase-input power supply, which provides a floating,
stabilized and galvanically separated SELV/PELV output voltage.
The output of the device fulfils the requirements for a limited power source acc. to NEC Class 2.
The device is optimized for parallel use to increase the output current or for redundant power supply
systems. For an easy replacement, the device is equipped with pluggable screw terminals.
Intended Use
This device is designed for installation in an enclosure and is intended for commercial use, such as
in industrial control, process control, monitoring and measurement equipment or the like. Do not use
this device in equipment where malfunction may cause severe personal injury or threaten human
life.
Installation Instructions
Install device in an enclosure providing protection against electrical, mechanical and fire hazards.
Install the device onto a DIN-rail according to EN 60715 with the input terminals on the bottom of the
device. Other mounting orientations require a reduction in output current.
Make sure that the wiring is correct by following all local and national codes. Use appropriate copper
cables that are designed for a minimum operating temperature of 60°C for ambient temperatures up
to +45°C, 75°C for ambient temperatures up to +60°C and 90°C for ambient temperatures up to
+70°C. Ensure that all strands of a stranded wire enter the terminal connection.
The device is designed for pollution degree 2 areas in controlled environments. No condensation or
frost is allowed.
The housing of the device provides a degree of protection of IP20. The housing does not provide
protection against spilled liquids.
The isolation of the device is designed to withstand impulse voltages of overvoltage category II
according to IEC 60664-1.
The device is designed as “Class of Protection” I equipment according to IEC 61140. Do not use
without a proper PE (Protective Earth) connection.
The device is suitable to be supplied from TN, TT and IT mains networks. The continuous voltage
between the input terminals and the PE potential must not exceed 300Vac.
The input can also be powered from batteries or similar DC sources. The continuous voltage
between the supply voltage and the PE/ground potential must not exceed 375Vdc.
A disconnecting means shall be provided for the input of the device.
The device is designed for convection cooling and does not require an external fan. Do not obstruct
airflow and do not cover ventilation grid!
The device is designed for altitudes up to 2000m (6560ft).
Keep the following minimum installation clearances: 40mm on top, 20mm on the bottom, 0mm left
and right side. Increase the 0mm to 15mm in case the adjacent device is a heat source.
The device is designed, tested and approved for branch circuits up to 16A (IEC) or 15A (UL) without
additional protection device. If an external fuse is utilized, do not use circuit breakers smaller than
10A B- or 6A C-Characteristic to avoid a nuisance tripping of the circuit breaker.
The maximum surrounding air temperature is +70°C (+158°F). The operational temperature is the
same as the ambient or surrounding air temperature and is defined 2cm below the device.
The device is designed to operate in areas between 5% and 95% relative humidity.
Installation Instructions for Hazardous Location Areas
The device is suitable for use in Class I Division 2 Groups A, B, C, D locations.
Substitution of components may impair suitability for this environment.
Do not disconnect the device or operate the voltage adjustment unless power has been switched off
or the area is known to be non-hazardous.
Functional Description
The output is electronically protected against no-load, overload and short circuit and can supply any
kind of loads, including inductive and capacitive loads.
Do not apply return voltages from the load to the output terminals higher than 35V.
The output voltage can be adjusted with a small flat-blade screwdriver on the front of the unit.
The green DC-OK LED reports a voltage on the output terminals above 19V.
Devices can be paralleled to increase the output power. The ambient temperature is not allowed to
60°C. The device is featured with a “soft output regulation characteristic” in order to
achieve current share between multiple devices. This regulates the output voltage in such a manner
that the voltage at no load is approx. 4% higher than at nominal load. If more than three devices are
connected in parallel, a diode, fuse or circuit breaker with a rating of 4A is required on each output.
Same devices can be connected in series for higher output voltages. It is allowed to connect as
many outputs in series as needed, providing the sum of the output voltage does not exceed 150Vdc.
In case of an internal defect, a redundant circuit limits the maximum output voltage to 39V. The
output shuts down and automatically attempts to restart.
The DC-OK signal reports an output voltage above 19V on the output terminals. The signal is an
open collector source output to feed loads up to 30mA. Connect the load (relay, LED, PLC) between
the DC-OK pin and the negative output voltage. An external free-wheeling diode is not required.
Technical Data
All values are typical figures specified at 230Vac, 50Hz input
voltage, 24V 2.1A output load, 25°C ambient temperature and
after a 5 minutes run-in time unless otherwise noted.
Output voltage
DC 24V
Nominal
Adjustment range
24 – 28Vdc
Factory setting 24.5V
Output current
2.1 – 1.8A
Below +60°C ambient
1.6 – 1.3A
At +70°C ambient
Derate linearly b60°C and +70°C
Input voltage AC
AC 100 – 240V
-15% / +10%
Mains frequency
50 – 60Hz
±6%
Input current AC
0.83 / 0.52A
At 120 / 230Vac
Power factor
0.56 / 0.48
At 120 / 230Vac
Input voltage DC
DC 110-300V
-20% / +25%
Input current DC
0.51 / 0.19A
At 110 / 300Vdc
Input inrush current
17 / 35A pk
At 120 / 230Vac, 40°C,
cold start
Efficiency
88.4 / 89.0%
At 120 / 230Vac
Power losses
6.6 / 6.2W
At 120 / 230Vac
Hold-up time
40 / 180ms
At 120 / 230Vac
Temperature range
-10 to +70°C
Max. wire size (litz wire)
2.5mm²
Wire size AWG
AWG 24-12
Max. wire diameter
2.4mm
Wire stripping length
7mm / 0.28inch
Tightening torque
0.45Nm / 4lb.inch
Size (wxhxd)
45x75x91mm Without
DIN-rail
Weight
240g / 0.53lb
Functional Diagram
Input
Fuse
&
Input
Filter
L
N
Output Over-
Voltage
Protection
Input
Rectifier
&
Inrush
Limiter
Output
Voltage
Controller
+
+
-
DC-OK
Output
Filter
V
OUT
DC-ok
LED
Power
Converter
-
Output Characteristic
Output voltage
4.0A
24V
Output current
0V
2.0A
3.0A
0A
Adjustment range
28V
1.0A
2.5A
A: 100Vac
B: 120Vac
C: 230Vac
0.5A
1.5A
3.5A
A: for 100Vac mains
B: for 120Vac mains
C: for 230Vac mains
A
B
C
Temperature Range
Allowed output current at 24V
Ambient temperature
0A
-10
2.1A
+60
+70°C
1.6A
