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CT5.121 Installation Manual
EN
Product Description
The CT5.121 is a DIN-rail mountable power supply for three-phase mains systems, which provides a
floating, stabilized and galvanically separated SELV/PELV output voltage.
The device utilizes only two legs of a three-phase system, which saves wiring and installation costs.
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.
Unused screw terminals should be securely tightened.
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 isolation of the device is designed to withstand impulse voltages of overvoltage category III
according to IEC 60664-1. For corner grounded delta systems, the overvoltage category level 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- and IT mains networks. The voltage between the L
terminals and the PE terminal must not exceed 500Vac 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 32A (IEC) and 30A (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.
WARNING EXPLOSION HAZARDS!
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 loads and capacitive loads.
Do not apply return voltages from the load to the output terminals higher than 25Vdc.
The output voltage can be adjusted with a small flat-blade screwdriver on the front of the unit.
The green DC-OK LED reports an output voltage above 10.5V of a running device.
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.
Devices can be paralleled to increase the output power. The ambient temperature is not allowed to
exceed +45°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 20V. The output
shuts down and automatically attempts to restart.
Technical Data
All values are typical figures specified at 400Vac 50Hz input voltage, 12V
8A output, 25°C ambient temperature and after a 5 minutes run-in time
unless otherwise noted.
Output voltage
DC 12V
Adjustment range
12 – 15Vdc
Output current
8.0 – 6.4A
6.0 – 4.8A
Derate linearely between +60°C and +70°C
Input voltage AC
AC 380 - 480V
Mains frequency
50 – 60Hz
Input current AC
0.64 / 0.56A
Power factor
0.44 / 0.42
Input inrush current
4 / 4A peak
Efficiency
85.4 / 85.8%
Losses
16.4 / 15.9W
Hold-up time
43 / 63ms
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
7mm / 0.28inch
Tightening torque
1Nm / 9lb.inch
Size (wxhxd)
40x124x117mm
Weight
500g / 1.1lb
Functional Diagram
L1
Input Fuse
Input Filter
PFC
L2
Input Rectifier
Inductor
Inrush Current
Limiter
Temper-
Output
Output
ature
Over-
Power
Shut-
Voltage
Manager
down
Protection
Output Characteristic
Output voltage
15V
12V
6V
0V
0A
2A
4A
6A
Temperature Range
Allowed output current at 12V
8A
6A
A: continuous
B: short term (max. 60s)
0A
-25
0
+25
Nominal
Factory setting 12.0V
Below +60°C ambient
At +70°C ambient
-15% / +20%
±6%
At 400 / 480Vac
At 400 / 480Vac
At 400 / 480Vac
At 400 / 480Vac
At 400 / 480Vac
At 400 / 480Vac
Without DIN-rail
+
+
Power
Output
Converter
Filter
-
-
DC-OK
LED
Voltage
V
Regulator
OUT
Adjustment range
10A
8A
12A
14A
Output current
B
A
+45
+60
+70°C
Ambient temperature
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