Power System Overview
The Siemens 39PSMNAN operates as a dedicated power supply module for the SIMATIC S7-300 PLC system. This unit converts incoming AC mains voltage into stable DC power for all backplane modules. It delivers multiple output rails to satisfy various component requirements. Automation engineers rely on this module for consistent and clean system power.
Technical Specifications
The 39PSMNAN measures 125 mm in height and 40 mm in width. Its slim housing saves valuable space in control cabinets. The module weighs approximately 0.6 kilograms. It accepts a wide input voltage range from 85 VAC to 264 VAC.
| Parameter | Specification |
|---|---|
| Model | 39PSMNAN |
| Product Type | Power Supply Module |
| Dimensions | 125 mm x 40 mm x 120 mm (depth) |
| Weight | ~0.6 kg |
| Input Voltage | 85 VAC to 264 VAC (single-phase) |
| Input Frequency | 47 Hz to 63 Hz |
| Output Voltage 1 | 24V DC (2.5 A) |
| Output Voltage 2 | 5V DC (5 A) |
| Total Output Power | 85 W (maximum) |
| Efficiency | 89% (typical) |
| Connector Type | 1 x 3-pin AC input header, 1 x 6-pin DC output header |
| On-board Components | 1 x transformer, 2 x rectifiers, 4 x filter capacitors |
| Energy Storage | 2200 μF bulk capacitance (input side) |
| Protection | Overvoltage, overcurrent, short-circuit |
| LED Indicators | 1 x Power OK (green) |
| Operating Temp. | 0°C to +55°C |
Power Conversion Architecture
This module employs a switched-mode power supply design for high efficiency. The input stage rectifies and filters the AC mains voltage. A high-frequency transformer provides isolation between input and output. The secondary stage produces both 24V DC and 5V DC outputs. The 24V rail delivers 2.5 A for field devices and I/O modules. The 5V rail supplies 5 A for logic circuits and processors. A 2200 μF capacitor stores energy for brief input dropouts.
Interface and Protection Features
The Siemens 39PSMNAN uses a 3-pin header for AC input connections. A 6-pin header distributes the DC outputs to the backplane. Three protection circuits guard against overvoltage, overcurrent, and short-circuit faults. A green Power OK LED confirms all outputs within tolerance. The module automatically recovers from most fault conditions. A manual reset switch allows forced restart after severe faults.
Installation and System Integration
Installing the 39PSMNAN requires one slot in the S7-300 rack. The module connects to the backplane via the standard bus connector. You must wire the AC mains to the input header following safety guidelines. The module operates reliably between 0°C and 55°C ambient temperatures. Proper ventilation ensures optimal thermal dissipation. The module’s high efficiency minimizes heat generation in the cabinet.
Reliability and Maintenance
The Siemens 39PSMNAN delivers stable power for critical automation systems. Its switched-mode design ensures constant output regardless of input variations. The protection circuits prevent damage from wiring errors or load faults. Routine maintenance includes checking the Power OK LED and input fuse. Replacing the module requires only a power-down and simple unplugging.
Details
| Weight | 0.6 kg |
|---|---|
| Dimensions | 125 × 40 × 120 mm |
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