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This power supply module provides DC power to all INFI 90 rack components. It converts incoming AC line voltage into stable outputs for logic and I/O modules. The unit mounts in the leftmost slot of the INFI 90 rack.
Technical specifications
| Parameter | Specification |
|---|---|
| Brand | ABB Bailey |
| Model | ABB Bailey NPSM04 |
| Product Family | INFI 90 |
| Category | Power Supply Module |
| Input Voltage | 120/240V AC (selectable) |
| Input Frequency | 47 to 63 Hz |
| Input Current | 1.5A at 120V AC, 0.75A at 240V AC |
| Output Voltage 1 | +5V DC |
| Output Current 1 | 12A continuous |
| Output Voltage 2 | +15V DC |
| Output Current 2 | 2A continuous |
| Output Voltage 3 | -15V DC |
| Output Current 3 | 1A continuous |
| Output Voltage 4 | +24V DC (isolated) |
| Output Current 4 | 1.5A continuous |
| Total Output Power | 100 Watts maximum |
| Hold-up Time | 20 ms at full load |
| Efficiency | Approximately 80% |
| Component Count | 1 main PCB, 1 transformer, 12 capacitors, 1 fan |
| Energy Storage | 4 x electrolytic capacitors (1000 µF each) |
| Cooling Method | Internal fan with front intake |
| Dimensions (L x W x H) | Approx. 28 cm x 14 cm x 12 cm |
| Weight | Approx. 2.1 kg |
| Operating Temperature | 0°C to 55°C |
| Mounting | INFI 90 rack slot (leftmost) |
Detailed Technical Analysis
This power supply module accepts either 120V or 240V AC input voltage. You select the correct voltage using a slide switch on the side. The unit then produces regulated +5V, ±15V, and isolated +24V outputs. The +5V rail delivers up to 12 amps for logic circuits.
Now let us examine its output capabilities. The +15V and -15V rails power analog circuits and op-amps. The isolated +24V rail supplies power to field devices and relays. Four large electrolytic capacitors store energy for 20 milliseconds of hold-up time. The module achieves approximately 80% efficiency under normal load.
This power supply uses an internal fan for forced air cooling. The fan draws air through the front grille and exhausts from the rear. The ABB Bailey NPSM04 weighs 2.1 kilograms for stable rack mounting. A single PCB contains all power conversion and filtering circuits.
Installation and Configuration Guidelines
You mount this power supply in the leftmost slot of an INFI 90 rack. Connect the AC input wires to the terminal block on the front. Use 14 AWG or larger wire for the AC supply connection. The module automatically distributes DC power to the backplane.
For safety, connect a proper earth ground to the grounding terminal. Do not exceed the maximum output current on any rail. The internal fan requires adequate clearance for air intake. Leave at least 5 centimeters of space in front of the grille.
Practical Applications
Engineers use this power supply for INFI 90 system power and restoration. It powers complete racks with multiple logic and I/O modules. This component also works in legacy DCS retrofit projects. Its 100-watt capacity suits medium-sized INFI 90 configurations.
Summary of Features
To conclude, this power supply delivers 100 watts with +5V, ±15V, and +24V outputs. It weighs 2.1 kilograms and includes an internal cooling fan. Choose ABB Bailey NPSM04 for reliable rack power in INFI 90 systems.