EN
QS5.241-60 Installation Manual
Product Description
The QS5.241-60 is a DIN-rail mountable DC/DC converter, which provides a floating, stabilized and
galvanically separated SELV/PELV output voltage.
The device is equipped with conformal coated pc-boards.
Intended Use
This device is designed for installation in an enclosure and is intended for use in rolling stock
equipment for railway applications according to EN 50155 or for use 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 allowed.
The enclosure of the device provides a degree of protection of IP20.
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 can be powered from a regulated power supply or a similar DC source. The voltage
between the supply voltage terminals and ground must not exceed 375Vdc continuously.
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 6000m (19685ft). See additional requirements in the product
datasheet for use above 2000m (6560ft).
Keep the following minimum installation clearances: 40mm on top, 20mm on the bottom, 5mm left and
right side. Increase the 5mm to 15mm in case the adjacent device is a heat source. When the device
is permanently loaded with less than 50%, the 5mm can be reduced to zero.
The device is designed, tested and approved for branch circuits up to 30A (UL) and 32A (IEC) without
additional protection device. If an external fuse is utilized, do not use circuit breakers smaller than 6A
B- or C-Characteristic to avoid a nuisance tripping of the circuit breaker.
The maximum surrounding air temperature is +85°C (+185°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.
Check for correct supply voltage polarity. The device will not operate when the voltage is reversed.
Functional Description
The output is electronically protected against no-load, overload and short circuit and can supply any
kind of loads, including unlimited inductive loads 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 behind the flap on the front.
The green DC-OK LED reports an output voltage above 90% of the adjusted voltage of a running
device.
The DC-OK relay monitors the output voltage and the contact is closed when the DC-OK LED is on.
Contact ratings: 60Vdc 0.3A, 30Vdc 1A, 30Vac 0.5A for resistive loads.
The red overload LED is on, when the output voltage falls below 90% of the adjusted value or in case
of a short circuit in the output. The LED is flashing, when the device has switched off due to over-
temperature. Input voltage is required.
The device is equipped with an over-temperature protection. In case of a high temperature, the output
shuts down and starts automatically again after cooling off.
The device is designed to deliver 6.3A output current for up to 4s with nominal output voltage.
Devices can be paralleled to increase the output power. The output voltage shall be adjusted to the
same value (±100mV) with the same load conditions on all devices, or the devices can be left with the
factory settings. The ambient temperature is not allowed to 60°C. If more than three devices
are connected in parallel, a diode, fuse or circuit breaker with a rating of 10A is required on each
output.
Same devices can be connected in series for higher output voltages. It is allowed to connect as many
devices 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 36V. The output
shuts down and automatically attempts to restart.
Technical Data
All values are typical figures specified at 110Vdc input voltage, 24V 4.2A
output, 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 24.1V
Output current
Continuous:
4.2 – 3.6A
Below +70°C ambient
Short-term, up to 4s:
6.3 – 5.4A
Below +70°C ambient
Short-term, up to10 minutes:
4.2 – 3.6A
Below +85°C ambient
Input voltage DC
DC 110V
-30% / +40%
Input voltage range
77 - 154Vdc
Input current DC
1.0A
Input inrush current
10A pk
Temp. independent
Efficiency
91.1%
Power losses
9.8W
Hold-up time
42ms
Temperature range
-25 to +85°C
Max. wire size (litz wire)
4mm² Input
terminals
Wire size AWG
AWG 20-10
Input terminals
Max. wire diameter
2.8mm Input
terminals
Wire stripping length
10mm / 0.4inch
Input terminals
Max. wire size (litz wire)
2.5mm² Output/DC-OK
terminals
Wire size AWG
AWG 26-12
Output/DC-OK terminals
Max. wire diameter
2.3mm Output/DC-OK
terminals
Wire stripping length
6mm / 0.25inch
Output/DC-OK terminals
Size (wxhxd)
40x124x117mm Without
DIN-rail
Weight
640g / 1.41lb
Functional Diagram
+
+
-
-
DC-OK
contact
Output
Over-
Voltage
Protection
Boost
Converter
Output
Voltage
Regulator
Output
Filter
DC-ok
Relay
Output
Voltage
Monitor
Output
Power
Manager
Temper-
ature
Shut-
down
DC-OK
LED
Input Fuse
Input Filter
Active
Inrush
Limiter
Power
Converter
+
-
V
OUT
13
14
Reverse
Polarity
&
Back-
feeding
Protection
Overload
LED
Output Characteristic
Output voltage
10A
24V
Output current
12V
0V
2A
4A
6A
8A
0A
Adjustment range
28V
A: continuous
B: up to 4s
A
B
Temperature Range
Allowed output current at 24V
Ambient temperature
2A
0A
-25°C
A: continuous
B: up to 4s
C: up to 10 minutes
6A
+25°C
0°C
+50°C
+70°C
+85°C
4A
4.2A
6.3A
A
C
B
