Siemens 6ES5984-1UA31 Power Supply

Robust Power Conversion for SIMATIC S5 Systems

The Siemens 6ES5984-1UA31 delivers reliable power conversion for the SIMATIC S5 programmable controller platform. This unit accepts 120/230 V AC input and provides a stable 24 V DC output for powering the CPU, I/O modules, and field devices. Its metal enclosure measures 250 mm in height, 70 mm in width, and 180 mm in depth, fitting standard S5 rack configurations. The total weight reaches approximately 2.8 kg, reflecting its robust transformer and filtering components.

This power supply delivers a continuous output current of 10 A, sufficient for powering fully populated S5 systems. The following table details the complete technical specifications for this power conversion solution:

Parameter	Specification
Product Brand	Siemens
Product Model	6ES5984-1UA31
Product Category	Power Supply Module
Platform Compatibility	SIMATIC S5
Input Voltage	120/230 V AC ±15% (selectable)
Input Frequency	47-63 Hz
Output Voltage	24 V DC
Output Current	10 A (continuous)
Output Power	240 W
Efficiency	87% typical
Dimensions (H x W x D)	250 mm x 70 mm x 180 mm
Weight	2.8 kg
Ripple and Noise	< 100 mV peak-to-peak
Hold-up Time	30 ms minimum
Operating Temperature	0°C to +55°C
Storage Temperature	-40°C to +85°C
Isolation Voltage	3000 V AC (input-to-output)

Input Flexibility and Global Compatibility

The 6ES5984-1UA31 accepts both 120 V and 230 V AC input voltages with ±15% tolerance for industrial mains variations. Users can select the appropriate input range via a convenient voltage selector switch. This module operates across a wide frequency range from 47 to 63 Hz, accommodating global power grids. Engineers can therefore deploy this unit in facilities worldwide without modification.

Output Regulation and Load Handling

The regulated 24 V DC output maintains ±2% voltage accuracy across all load conditions from 0 to 10 A. This stable output ensures proper operation of all connected S5 modules and field devices. The unit delivers a hold-up time of 30 ms minimum, allowing the system to ride through brief power interruptions. This extended hold-up protects critical control processes from unexpected voltage sags.

Protection Features and Thermal Management

Built-in overvoltage protection clamps the output at safe levels during regulator failure events. Overcurrent protection limits the output current to prevent damage from short-circuited loads. The module employs natural convection cooling with a large heatsink for efficient heat dissipation. Operating temperatures from 0°C to +55°C cover standard industrial environments without requiring derating.