EN
AC1253 Installation Manual
Product Description
The AC1253 is a DIN-rail mountable power supply for three-phase mains systems, which provides
network power for the AS-Interface
®
system. The AS-Interface
®
system is a field bus technology,
where power and data are provided by the same single two-conductor wire. Therefore, special power
supplies with an integrated data-decoupling circuit are required to prevent the modulated signal
voltage on the AS-Interface
®
bus from being corrupted.
Intended Use
This device is designed for installation in an enclosure and is intended for commercial use to supply
power to AS-Interface
®
network systems.
Do not use this device in equipment, where malfunctioning may cause severe personal injury or
threaten human life without additional appropriate safety devices, that are suited for the end-
application.
If this device is used in a manner outside of its specification, the protection provided by the device may
be impaired.
When operating without AS-Interface structure (e.g. in a laboratory test), connect a 470μF/35V
capacitor between AS-Int and AS-Interface – terminals to avoid output voltage oscillations.
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.
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. Use ferrules for wires on the
input terminals. Unused screw terminals should be securely tightened.
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 housing does not provide
protection against spilled liquids.
The device is designed for overvoltage category II zones. Below 2000m altitude the device is tested
for impulse withstand voltages up to 4kV, which corresponds to OVC III 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 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 5000m (16400ft). Above 2000m (6560ft) a reduction in
output current is required.
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.
Functional Description
The output is electronically protected against no-load, overload and short circuit.
The green AS-i-OK LED reports a nominal output voltage of a running device. The LED is off as soon
as the unit is in overload mode.
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.
Do not parallel devices for higher output currents.
Do not connect outputs of devices in a series connection for higher output voltages.
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 3x 400Vac 50Hz input voltage,
symmetrical phase voltages, 30.6V 8A output load, 25°C ambient
temperature and after a 5 minutes run-in time unless otherwise noted.
Output voltage
DC 30.6V
Nominal
Adjustment range
Not adjustable
Factory setting 30.6V
Output current
8A
Below +60°C ambient
6A
At +70°C ambient
Derate linearly b60°C and +70°C
For use on AS-Interface
®
networks only
Current limitation
>8.4A
Input voltage AC
3AC 380-480V
-15% / +20%
Mains frequency
50 – 60Hz
±6%
Input current AC
0.7 / 0.6A
At 3x400 / 3x480Vac
Power factor
0.53 / 0.52
At 3x400 / 3x480Va
Input inrush current
4 / 4A pk
At 400 / 480Vac, temp.
independent
Efficiency
92.0 / 92.1%
At 3x400 / 3x480Va
Power losses
21.2 / 20.9W
At 3x400 / 3x480Va
Hold-up time
34 / 53ms
At 3x400 / 3x480Va
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)
62x124x120mm
Without DIN-rail
Weight
850g / 1.87lb
Functional Diagram
Input
Fuse
Input
Filter
Input
Rectifier
L1
Output
Overvoltage
Protection
PFC
Inductor
&
Inrush
Limiter
AS-i +
Output
Filter
AS-i-ok
(green)
Power
Converter
Shield
AS-i
Decoupling
Unit
AS-i +
AS-i -
AS-i -
Temperature
Shut-down
L2
L3
Output Characteristic
Output voltage
12A
Output current
15V
0V
2A
4A
6A
0A
30.6V
8A
10A
Temperature Range
Allowed output current
Ambient temperature
0A
-25
8A
+60
+70°C
6A
A: continuous
B: short term (max. 60s)
A
B
0
