1756-PA72 AB
About 1756-PA72
Allen Bradley 1756-PA72 is a standard power supply primarily used to power the backplane of the 1756 ControlLogix chassis, enabling each module connected to the chassis to operate. 1756-PA72 is designed to accept an input voltage range of 85-265 VAC and a frequency range of 47-63 Hz. It provides an output power of 75 W @ 0-60 ° C (+32…+140 ° F), with a current capacity of 4A at 3.3VDC; 10A at 5.1VDC and 2.8A at 24VDC.
The holding time of 1756-PA72 at 85VAC and 50/60 Hz is 5 cycles; 6 cycles @ 120VAC, 50/60 Hz; 6 cycles @ 200VAC, 50/60 Hz, and 6 cycles @ 240V AC, 50/60 Hz. Hold time refers to the reaction of the power supply from the removal of input voltage and the beginning of a DC power supply failure.
1756-PA72 is installed at the leftmost position of the chassis. It has a dedicated slot allocation located outside the rack and does not occupy ControlLogix slots. It can be installed in different ControlLogix chassis, such as 1756-A4, 1756-A7, 1756-A10, 1756-A13, and 1756-A17, whether it is Series A, B, or C. The power supply weighs approximately 0.95 kilograms (2.10 pounds) and has a physical size of 14.0 x 11.2 x 14.5 centimeters (5.51 x 4.41 x 5.71 inches). This module, along with the ControlLogix chassis, has an open enclosure, so it needs to be installed inside the enclosure to protect the hardware from industrial pollutants and interference. 1756-PA72 may not be used for redundant power applications, but it can also be used for distributed I/O architectures.
The power consumption of 1756-PA72 is 25 watts at 0 to 60 degrees Celsius (32 to 140 degrees Fahrenheit). The power consumption of this power supply is 85.3 BTU/hour, and the maximum surge current of the power supply is 20 A. Allen Bradley 1756-PA72 provides built-in overcurrent protection. It is provided by the user with a maximum current of 15 A. The maximum transformer load of this power supply is 100VA, and the voltage isolation is 250V continuous voltage. The 1756-PA72 also has an enhanced insulation type that can be tested at 3500 volts DC for 60 seconds. Allen Bradley 1756-PA72 is an open device. The power supply should be installed in an appropriate enclosure designed specifically for specific environmental conditions. The interior of the casing should only be accessible with tools.
