3PS791.90-1 B & R Automation
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The B & R Automation 3PS791.90-1 is part of the System 2005 Controllers series and features a nominal input voltage of 230 VAC with a voltage range from 187 to 265 VAC. It operates with a maximum output power of 45 watts and supports input frequencies between 47 and 63 Hz. The controller offers a maximum current flow of 0.4 A and includes a ready relay rated at 3 A with 780 V VDR protection.
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Product Description:
The 3PS791.90-1 is a power-supply and monitoring module manufactured by B&R Automation for the System 2005 Controllers series. It conditions mains power for the controller backplane and drives a readiness contact that informs higher-level safety logic when operating limits are met. Within an industrial automation panel, the unit stabilizes control voltages and guards against brownouts, ensuring uninterrupted service for CPUs, communication interfaces, and distributed I/O. Its combined supply and status functions reduce the need for separate monitoring hardware in compact control cabinets.
The module accepts a line window from 187 VAC to 265 VAC, centered on the nominal 230 V rating, so routine sags or swells do not interrupt the control rail. Internal circuitry limits steady-state input current to 0.4 A, allowing downstream breakers and cabling to be sized accurately. Frequency tolerance spans 47 Hz up to the 63 Hz ceiling, enabling use on 50 Hz, 60 Hz, or slightly off-spec generator supplies. When fully loaded, the converter furnishes as much as 45 W of regulated DC to the System 2005 backplane, powering multiple logic and interface cards. Soft-start sequencing and over-voltage shutdown protect electrolytic components while preserving program execution during mains disturbances.
Status output is delivered through a normally open ready relay rated to carry control loads of up to 3 A and protected by a 780 V VDR that absorbs switching transients. Contact ratings reach 270 VAC / 30 VDC, so the relay can switch either line-level interlocks or low-voltage PLC inputs. Data integrity is supported by a capacitor bank that buffers RAM at 12 V; charging begins at 8 V and disconnects above 30 V to protect memory devices from excess stress. A remote I/O slave interface is provided, allowing this power module to report diagnostic states across the System 2005 network without additional wiring complexity.
Frequently Asked Questions about 3PS791.90-1:
Q: What is the nominal input voltage required for the 3PS791.90-1 controller?
A: The 3PS791.90-1 controller in the System 2005 series has a nominal input voltage rating of 230 VAC.
Q: What is the maximum output power of the 3PS791.90-1 controller?
A: The 3PS791.90-1 unit can deliver up to 45 W of output power to connected devices.
Q: What input frequency range does the 3PS791.90-1 support?
A: This controller accommodates an input frequency range from 47 Hz up to 63 Hz.
Q: What are the current rating and protection details for the ready relay on the 3PS791.90-1?
A: The ready relay on the 3PS791.90-1 features a contact rating of 3 A and protection with 780 V VDR.
Q: What RAM buffer voltage range does the 3PS791.90-1 controller offer?
A: The 3PS791.90-1 provides a RAM buffer with a voltage range from 8 V to 30 V, nominally operating at 12 V.
