The 1756-PA72 is a standard power module in the ControlLogix series produced by Allen-Bradley (Rockwell Automation), and its main function is to provide power to the backplane of the ControlLogix case, ensuring that every module connected to the case is able to function properly.
The following are the detailed specifications and features of the module:
Input voltage range: 85-265 VAC.
Frequency range: 47-63 Hz.
Output power: 75 W at 0-60°C (32-140°F).
Current capacity: 4A at 3.3VDC; 5.1 10A for VDC; 2.8A at 24VDC.
Holding time: Under different AC voltages, the holding time is 5 cycles at 85VAC, 6 cycles at 120VAC, 6 cycles at 200VAC, and 6 cycles at 240VAC. Hold time refers to the reaction time of the power supply to the removal of the input voltage and the DC power failure.
Installation position: It is usually installed on the leftmost side of the chassis and does not occupy the ControlLogix slot.
Compatible chassis: Can be installed in different series of ControlLogix chassis such as 1756-A4, 1756-A7, 1756-A10, 1756-A13 and 1756-A17.
Physical dimensions: 14.0 x 11.2 x 14.5 cm (5.51 x 4.41 x 5.71 inches).
Weight: Approximately 0.95 kg (2.10 lb).
Power consumption: 25 watts at 0 to 60 degrees Celsius (32 to 140 degrees Fahrenheit).
Power dissipation: 85.3 BTU/ hour.
Maximum surge current: 20 amps.
Overcurrent protection: Provides built-in overcurrent protection, and users need to provide protection up to 15 amps.
Maximum transformer load: 100 volt-ampere.
Voltage isolation: 250 V continuous voltage.
Insulation type: Enhanced, test for 60 seconds at 3500 volts DC.
The 1756-PA72 power module is designed to provide a stable power supply in industrial environments, ensuring reliable operation of the ControlLogix system. It is suitable for a variety of industrial automation applications and needs to be installed in a proper housing to protect the hardware from contaminants and interference. The module is not suitable for redundant power applications, but can be used in distributed I/O architectures.