Power supplies
7 Power supplies
Power supplies available from B&R are recommended to provide power to the products. All available variants are
available on the B&R website.
7.1 System characteristics
In order to satisfy demands for complete, comprehensive system solutions, B&R offers a wide range of power
supplies for top-hat rail installation. This extensive spectrum ranges from single-phase power supplies that supply
2 A up to three-phase power supplies that supply 40 A. All switching power supplies can manage a wide range
of AC and DC input voltages. This input voltage ranges from 100 to 240 VAC or 400 to 500 VAC and from 90 to
350 VDC. In addition to a wide range of input voltages, these devices are also certified for a wide temperature
range spanning from -25°C to 70°C. In addition to being no-load proof, all power supplies also provide short circuit
and overload protection.
Optimal layout of connection and control elements
Connection terminals and control elements are clearly labeled and arranged on the front of the device. And since
the terminals are located at the top or bottom of the front of these devices, they are extremely easy to access.
The large size and stability of the terminals also allow the use of a battery-operated screwdriver. Furthermore,
the terminals are designed so that the cable does not require heat protection even when using larger devices.
These units also come equipped with a third minus terminal for easily implementing secondary grounding, further
reducing installation costs.
Safety is key
Electronic current limiting protects electrical installations from overload and short circuits. Overvoltage protection
protects connected consumers in the event that the controlled system fails. Overtemperature protection initiates a
continuous reduction of output power when the temperature gets too high until it has once again returned to the
permissible range (thermal load distribution).
Overload characteristics
To prevent devices from immediately cutting off when a minimal overload occurs, these power supplies operate
according to an I-V curve with a variable operating point:
•
Output characteristics: The I-V curve ensures that highly capacitive loads as well as consumers with DC-
to-DC converters in the input circuit are reliably supplied.
•
Overload design: Output current is limited if a short circuit or overload occurs. Instead of cutting off, the
unit delivers a continuous output current. The secondary voltage is also lowered until the secondary short
circuit or overload has been corrected. Downstream fuses are triggered. Identical power supplies can be
connected in parallel without creating any sort of startup problems.
Electromagnetic compatibility (EMC)
All devices satisfy EN 61000-6-2 (immunity) and EN 61000-6-3 (emissions) standards in the highest respective
class. Noise suppression is also provided on the output to prevent even long unshielded lines from emitting noise.
Also provided:
•
Transient overload protection to protect the device from voltage spikes on the mains.
•
Inrush current limitation effective for warm devices as well. As a result, even the 0PS3400.1 (24 V / 40
A) allows protection using conventional circuit breakers, which are used in the supply line in any case.
In addition to these functions, EMC is also included in the CE certification. These power supplies also satisfy EN
50178, EN 60204-1 and UL508 LISTED requirements in addition to standard international certifications (IEC 60950,
EN 60950, UL 60950, CUL CSA-C22.2 No 60950).
Installation / EMC guide 1.36 (April 2021) 35
To Next Page
Loading...