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QT20.361 Installation Manual
EN
Product Description
The QT20.361 is a DIN-rail mountable power supply for three-phase mains systems, which provides a
floating, stabilized and galvanically separated SELV/PELV output voltage.
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 enclosure of the device provides a degree of protection of IP20. The enclosure does not provide
protection against spilled liquids.
The isolation of the device is designed to withstand impulse voltages of overvoltage category III
according to IEC 60664-1. Above 2000m the overvoltage category is reduced to level II.
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 or IT mains networks. The continuous voltage
between the input terminal and the PE potential must not exceed 400Vac. The device is not designed
to be used on corner grounded delta systems.
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 16A (IEC) and 15A (UL) without
additional protection device. If an external fuse is utilized, do not use circuit breakers smaller than 6A
B- or 3A 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 unlimited inductive and capacitive loads.
Do not apply return voltages from the load to the output terminals higher than 48V.
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 or too high 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 20A output current for up to 4s with nominal output voltage.
Devices can be paralleled to increase the output power. The ambient temperature is not allowed to
exceed +60°C. 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. If more than three
devices are connected in parallel, a diode, fuse or circuit breaker with a rating of 20A 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 53V. The output
shuts down and automatically attempts to restart.
Technical Data
All values are typical figures specified at 3x 400Vac 50Hz input voltage,
symmetrical phase voltages, 36V, 13.3A output load, 25°C ambient
temperature and after a 5 minutes run-in time unless otherwise noted.
Output voltage
DC 24V
Adjustment range
36 – 42Vdc
Output current
Continuous:
13.3 – 11.4A
10.0 – 8.6A
Short-term, up to 4s:
20.0 – 17.1A
Derate linearely between +60°C and +70°C
Input voltage AC
3AC 380 - 480V
Mains frequency
50 – 60Hz
Input current AC
0.79 / 0.65A
Power factor
0.94 / 0.95
Input inrush current
3 / 3A peak
Efficiency
94.8 / 94.6%
Losses
26.3 / 27.4W
Hold-up time
22 / 22ms
Temperature range
-25 to +70°C
Max. wire size (litz wire)
4mm²
Wire size AWG
AWG 20-10
Max. wire diameter
2.8mm
Wire stripping length
10mm / 0.4inch
Size (wxhxd)
65x124x127mm
Weight
870g / 1.92lb
Functional Diagram
L1
Input Filter
L2
Input Rectifier
PFC
Inrush Current
Converter
L3
Limiter
Temper-
Output
Output
ature
Over-
Power
Shut-
Voltage
Manager
down
Protection
Output Characteristic
Output voltage
42V
36V
A: continuous
B: for 4s
0V
0A
4A
8A
12A
Temperature Range
Allowed output current at 36V
20A
13.3A
10A
A: continuous
B: short term (typ. 4s)
0A
-25
0
Nominal
Factory setting 36V
Below +60°C ambient
At +70°C ambient
Below +70°C ambient
±15%
±6%
At 3x400 / 480Vac
At 3x400 / 480Vac
At 3x400 / 480Vac,
temp. independent
At 3x400 / 480Vac
At 3x400 / 480Vac
At 3x400 / 480Vac
Without DIN-rail
Voltage
V
Regulator
OUT
+
+
Output
Power
Filter
Converter
-
-
Overload
LED
DC-OK
LED
13
DC-ok
DC-OK
14
Relay
Contact
Adjustment range
16A
20A
24A
Output current
+60
+70°C
Ambient temperature
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