ABB Bailey IEPDF02 Power Supply Board

Technical Specifications

Parameter	Value
Brand	ABB Bailey
Model	IEPDF02
Category	Power Supply Board
Weight	1.28 lbs (0.58 kg)
Dimensions	7.1 x 5.4 x 1.8 inches
Component Count	142 discrete components
Input Voltage	24V DC nominal
Input Range	18V to 32V DC
Output Voltages	+5V, +12V, -12V, +24V
+5V Output Current	6A maximum
+12V Output Current	1A maximum
-12V Output Current	0.5A maximum
+24V Output Current	1.5A maximum
Total Output Power	55W
Efficiency	82% typical
Ripple & Noise	<30 mV peak-to-peak
Protection	Overcurrent, overvoltage
Energy Storage	3 x 680µF, 4 x 220µF
Operating Temperature	-20°C to 60°C

Physical Construction and Component Layout

This IEPDF02 power supply board measures 7.1 inches in length. Its width reaches 5.4 inches with a height of 1.8 inches. The total weight comes to approximately 1.28 pounds. Manufacturers placed 142 discrete components on this four-layer PCB. These components include DC-DC converters, filter chokes, power transistors, and protection circuits. The board uses thick copper traces for high current paths.

Output Rails and Power Distribution

IEPDF02 generates four regulated DC outputs from a 24V input source. The +5V rail delivers up to 6 amps for logic circuits. A +12V rail supplies 1 amp for analog and communication sections. The -12V rail provides 0.5 amp for operational amplifiers. A pass-through +24V rail delivers 1.5 amps for field I/O devices. Total combined output power reaches 55 watts continuously. All outputs include overcurrent and overvoltage protection. Ripple and noise stay below 30 millivolts peak-to-peak. Consequently, this board provides clean power for sensitive electronics.

Input Flexibility and Energy Storage

The power supply board accepts a nominal 24V DC input voltage. The acceptable range spans from 18V to 32V DC. This wide tolerance accommodates battery systems and fluctuating supplies. For energy storage, the board integrates three 680µF capacitors. Four additional 220µF capacitors filter each output rail separately. These capacitors provide 15 milliseconds of hold-up time. Therefore, the IEPDF02 rides through brief input interruptions smoothly.

Efficiency and Application Use

IEPDF02 achieves 82% typical efficiency at nominal load. This high efficiency minimizes heat generation inside the enclosure. You will find this board in ABB Bailey INFI 90 control systems. It powers controller cards, I/O modules, and communication boards. The IEPDF02 operates reliably from -20°C to 60°C ambient. For example, it suits outdoor cabinets or cold storage facilities. Therefore, this power supply board provides stable DC energy for demanding Bailey automation systems.