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Technical specifications for 1756-PSCA2
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Manufacturer:Allen-Bradley
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Product Category:PLC Systems
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Spare Part Number:1756-PSCA2
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Weight:0.25 kg
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Tariff Code:8537101190
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Supply connections:2 redundant supply cable inputs
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Current capacity at 1.2 V DC:1.5 A
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Current capacity at 3.3 V DC:4 A
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Current capacity at 5.1 V DC:15 A
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Current capacity at 24 V DC:2.8 A
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Operating temperature:0 to 60 °C
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Storage temperature:-40 to 85 °C
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Relative humidity:5 to 95%, noncondensing
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Operating vibration:2 g at 10 to 500 Hz
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Operating shock:30 g
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Enclosure rating:Open style
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Connection wire category:Category 3 on 1756-CPR2 connections
Information
Overview
Downloads
Applications / Compatibility
Product Precautions
- Allen-Bradley 1756-PSCA2 separates the chassis connection from the power-conversion units, supporting a dual-supply arrangement in which either correctly sized supply can carry the chassis load.
Power path: One or two redundant supplies feed one chassis connector
Adapter current capacity: 4 A at 3.3 V DC; 15 A at 5.1 V DC
Environment: 0 to 60 °C operation; open-style construction
Adapter current capacity: 4 A at 3.3 V DC; 15 A at 5.1 V DC
Environment: 0 to 60 °C operation; open-style construction
The adapter fits the card guides at the left side of a compatible ControlLogix chassis and routes power to its backplane. In the Series B arrangement covered by 1756-IN005C, each redundant supply connects through a separate 1756-CPR2 cable. Chassis series and supply compatibility must be checked together.
The redundant supplies normally share the load; a surviving supply must be able to support the entire populated chassis if its partner fails. The adapter current capacities are 1.5 A at 1.2 V DC, 4 A at 3.3 V DC, 15 A at 5.1 V DC and 2.8 A at 24 V DC. These are adapter limits, not a promise that every rail can be fully loaded simultaneously by the selected supplies.
The standard 1756-PSCA2 operates from 0 to 60 °C in a suitable enclosure with noncondensing humidity. Supply-status annunciation is provided by the redundant power supplies, rather than by a configurable communication interface in the passive adapter. Cable retention, chassis grounding and the supply alarm circuit all remain part of the completed power system.
The redundant supplies normally share the load; a surviving supply must be able to support the entire populated chassis if its partner fails. The adapter current capacities are 1.5 A at 1.2 V DC, 4 A at 3.3 V DC, 15 A at 5.1 V DC and 2.8 A at 24 V DC. These are adapter limits, not a promise that every rail can be fully loaded simultaneously by the selected supplies.
The standard 1756-PSCA2 operates from 0 to 60 °C in a suitable enclosure with noncondensing humidity. Supply-status annunciation is provided by the redundant power supplies, rather than by a configurable communication interface in the passive adapter. Cable retention, chassis grounding and the supply alarm circuit all remain part of the completed power system.
Controller platform reference: ControlLogix redundant power system. Follow the applicable chassis and power-supply installation instructions.
Rockwell Automation ControlLogix Chassis and Power Supply, 1756-IN005C-EN-P provides the manufacturer reference for 1756-PSCA2 and its applicable system arrangement. The separate installation guide covers dual-source isolation, connector seating, power-budget review and annunciator testing.
1756-PSCA2 Official Technical Reference Excerpt
Rockwell Automation ControlLogix Chassis and Power Supply, 1756-IN005C-EN-P provides the manufacturer reference for 1756-PSCA2 and its applicable system arrangement. PDF · 8 pages.1756-PSCA2 Installation & Verification Guide
Apter Power guide covering dual-source isolation, connector seating, power-budget review and annunciator testing. PDF · 5 pages.
Original manufacturer pages retain their technical context. Use the Apter Power guide with the applicable manufacturer instructions and approved installation design.
System and supply context: 1756-PSCA2 forms the chassis connection in an assembled ControlLogix redundant-power system. Supplies, cables and chassis are separate items unless specifically included in the quotation.
Application scope: These uses concern chassis-power continuity. They do not establish redundant controllers, safety integrity or fault tolerance for every component.
Application scope: These uses concern chassis-power continuity. They do not establish redundant controllers, safety integrity or fault tolerance for every component.
Dual AC supplies
Use the adapter with a compatible pair of AC redundant supplies and dedicated supply cables when the installed chassis design uses AC input sources.Dual DC supplies
Connect a compatible DC redundant-supply pair to the chassis, with the full backplane demand included in each supply assessment.Mixed supply architecture
An approved AC/DC redundant pair can converge at the adapter when permitted by the chassis and supply compatibility requirements.Monitored power assemblies
Combine the adapter power path with supply annunciator inputs so a failed supply can be detected while the remaining source supports operation.
Prepare Allen-Bradley 1756-PSCA2 for its configured installation using these checks.
Isolate both sources
Remove both backplane power sources before disconnecting the adapter cables.
Match chassis series
Check the installed chassis series and its approved redundant supply combination.
Retain both cables
Inspect each connector and tighten its retaining screws; do not force misaligned contacts.
Calculate full demand
Check rail currents and total chassis power against one surviving supply.
Protect the open assembly
Use a suitable enclosure and maintain the standard adapter temperature range.
Prove supply alarms
Check the separate annunciator circuit and the controlled single-supply test before release.
Alternative Names
1756-PSCA2
1756PSCA2
Allen-Bradley 1756-PSCA2
Technical notes
Passive power routing: The adapter brings redundant supply connections to one chassis backplane; it is not a processor or communication module.
Thermal selection: Use the 0 to 60 °C standard-model limit and the selected supplies' load derating.
Redundancy boundary: The common adapter and interconnecting cables remain possible failure points.
FAQ View All FAQ
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Does 1756-PSCA2 convert the incoming AC supply?No. It is a passive adapter between the redundant supplies and the chassis backplane. AC or DC conversion is performed by the selected external power supplies.
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How do two power supplies share a chassis through 1756-PSCA2?Each supply connects to the adapter through its own dedicated cable. During normal operation the supplies share the load; either remaining supply must be sized to support the full chassis load.
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Which end of a 1756-CPR2 cable connects to 1756-PSCA2?The male end connects to the adapter and the female end to the redundant power supply. Secure both connectors with their retention screws after seating them.
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Can 1756-PSCA2 be unplugged while one redundant source remains energized?Do not disconnect its supply cables while either backplane power source is energized. A second active source still supplies the adapter, and connector arcing can damage contacts.
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What limits apply to the four DC rails passing through 1756-PSCA2?Adapter capacities are 1.5 A at 1.2 V, 4 A at 3.3 V, 15 A at 5.1 V and 2.8 A at 24 V DC. Apply the selected supply total-power and thermal limits as well.
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Does 1756-PSCA2 itself provide the supply-failure annunciator?The solid-state annunciator contacts belong to the redundant power supplies. Their monitoring circuit is wired separately so the controller can recognize a failed or switched-off supply.
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Is 1756-PSCA2 rated for the same temperature range as PSCA2XT?No. The standard 1756-PSCA2 operating range is 0 to 60 °C. The XT variant has separate environmental ratings and must not be treated as the same catalog item.
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Why does a 1756-PSCA2 installation still need cable and chassis checks?Power-supply redundancy addresses supply faults; it does not eliminate faults in the common adapter, cables or backplane. Verify connector engagement, grounding and the actual chassis loading.
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