Description

Phoenix Contact 342A3648P240W28

I. Basic Information

Part Number: 342A3648P240W28

Original OEM Model: QUINT-PS-100-240AC/24DC/10A

Brand: Phoenix Contact

Applicable System: Speedtronic Mark VIe Gas / Steam Turbine Control System. It supplies stable 24VDC DC control power to controllers, I/O cards and field acquisition terminal blocks, supporting single-unit redundant parallel connection and centralized power supply architecture deployment for multiple cabinet units.

Product Type: Industrial DIN-rail mounted AC-DC switching power supply module. It adopts wide-range AC input, active PFC (Power Factor Correction) and fully isolated step-down topology, integrating four hardware protection circuits including overvoltage, overcurrent, short-circuit and overtemperature protection. It is specially designed for high-reliability continuous operation scenarios in power stations.

Product Positioning

342A3648P240W28 is the standard DC power supply unit for the Mark VIe gas turbine control system. It stably converts 100~240V industrial mains AC into 24VDC control power to provide uninterrupted power supply for key equipment such as redundant processors, analog/digital I/O modules, IONET switches, field signal terminal blocks and LVDT acquisition cards. Multiple units of the same model can be connected in parallel with current sharing for capacity expansion to build dual redundant power supply loops; failure of a single power supply unit will not cause power loss and shutdown of the entire control system. The built-in filter and anti-interference circuit can resist harmonic, surge and electrostatic interference generated by inverters and high-voltage equipment in power plants, ensuring stable power supply for safety loops such as turbine speed regulation, load control, overspeed protection and ESD interlock. It is widely applied in new construction and technical renovation projects of Mark VIe control systems for thermal power plants, combined-cycle power stations, compressor units of long-distance oil & gas pipelines and turbine units of captive power plants.

Hardware Architecture

Wide-range AC Input & EMI Filter Unit

It is equipped with two-stage EMC power filter circuits and an active PFC circuit, compatible with single-phase 100~240V wide-voltage mains input. It suppresses reverse feed of grid harmonics, adapts to operating conditions with power grid voltage fluctuation and three-phase unbalanced power supply in power stations, and achieves a power factor of over 0.95.

Isolated High-frequency Step-down Conversion Unit

Adopting a high-frequency isolated transformer topology, it realizes complete electrical isolation between the high-voltage input side and the 24VDC low-voltage output side. Its dielectric withstand voltage complies with industrial high-voltage safety specifications, effectively blocking grid surges and lightning pulses from invading the control loop.

High-precision Voltage-stabilized & Current-sharing Output Unit

Rated output: 24VDC/10A (total power 240W). Equipped with a precision adjustable potentiometer, the output voltage can be finely adjusted within the range of 22.5~28.5V. A built-in parallel current-sharing circuit ensures balanced load distribution when multiple power supplies of the same specification operate in parallel, preventing overload and aging of individual units.

Multi-dimensional Hardware Protection & Status Indication Unit

It integrates OVP (Overvoltage Protection), OCP (Overcurrent Protection), automatic hiccup short-circuit protection and OTP (Overtemperature Protection) shutdown. A green DC OK operation indicator is mounted on the front panel, which lights up under normal power supply and turns off upon faults to intuitively display the operating status of the power supply and facilitate rapid on-site troubleshooting.

DIN-rail Heat Dissipation & Mounting Unit

It features an all-aluminum alloy housing with natural convection cooling without an internal cooling fan, avoiding faults caused by dust jamming and fan aging, and adapting to dust-proof sealed installation inside control cabinets. It adopts standard 35mm DIN-rail snap-on mounting for easy installation and removal, supporting dense horizontal arrangement of multiple units.

Mounting Specifications

AC Input Voltage: 100~240VAC (50/60Hz), allowable fluctuation range: 85~264VAC

Rated DC Output: 24VDC/10A, rated output power: 240W

Output Adjustable Range: 22.5VDC~28.5VDC

Mounting Method: Standard 35mm DIN-rail snap-on vertical installation inside the control cabinet

Overall Dimensions: 125mm (W) × 130mm (H) × 110mm (D)

Net Weight: 1.15kg

Ingress Protection Rating: IP20; it can only be installed inside sealed, constant-temperature, dehumidified and dust-proof industrial control cabinets.

Supporting Equipment: Mark VIe controllers, S/T/R triple redundant I/O cards, IONET industrial switches, shielded power supply cables, fuse terminal blocks

Commissioning Tools: High-precision digital multimeter, insulation resistance tester, torque screwdriver, infrared thermometer

Supporting System

Supporting Hardware

Mark VIe redundant controllers, various I/O signal acquisition modules, industrial Ethernet switches, 24VDC power distribution terminal blocks, loop protection fuses, twisted shielded power cables, diode modules for redundant parallel connection.

Commissioning Tools

GE ControlST configuration software, power quality analyzer, hipot tester, portable multimeter.

Upper-level Connection System

Plant DCS and SIS safety monitoring systems. An external voltage acquisition module can upload power supply operating status and fault signals to the upper system to realize remote fault alarm monitoring.

Typical Application Industries

Mark VIe control systems for 300MW/600MW/1000MW thermal power steam turbine generator units; gas turbine control devices for combined-cycle power plants; turbine control systems for compressor units of long-distance oil & gas pipelines; automation systems for generator units in metallurgical and chemical captive power plants; control projects for waste heat steam turbine units in distributed energy and biomass power stations.

Product Features

Wide Voltage Input & High PFC Design
Single-phase 85~264V wide-range AC input with active power factor correction (PF≥0.95), adapting to complex power supply conditions including grid voltage sags, harmonic distortion and frequent load fluctuations in power stations.
Redundant Parallel Current-sharing Performance
A built-in precision current-sharing control circuit allows up to 8 identical power supplies to be paralleled for capacity expansion with load imbalance ≤3%, enabling easy construction of dual or triple redundant safety power supply architectures and bumpless switching upon single-unit power supply faults.
All-metal Fanless Industrial Heat Dissipation
Integrated aluminum alloy housing with natural convection cooling has no rotating vulnerable parts, featuring dust resistance and vibration resistance. Its MTBF (Mean Time Between Failures) reaches no less than 200,000 hours, suitable for 7×24-hour uninterrupted continuous operation in power stations.
Comprehensive Six-level Safety Protection Mechanism
Six protection functions are integrated: input overvoltage, input undervoltage, output overvoltage, output overcurrent, short-circuit hiccup protection and overtemperature automatic shutdown. The power supply can automatically resume output after short-circuit faults are cleared without manual restart.
Industrial-grade EMC Anti-interference Performance
Compliant with the EN 61000 series electromagnetic compatibility standards, it can resist electrostatic discharge, electrical fast transient pulses, surges and radio frequency radiation interference, adapting to strong electromagnetic environments where inverters, high-power relays and high-voltage modules are densely arranged inside control cabinets.
Continuously Adjustable Output Voltage Design
A precision adjustable potentiometer is equipped on the front panel to finely tune the output voltage according to on-site cable voltage drop and multi-card load conditions, preventing abnormal controller reset caused by low terminal voltage resulting from long-distance power supply.

Attachment: 342A3648P240W28.png

II. Technical Specifications

1. Electrical Parameters

GE Part Number: 342A3648P240W28, Phoenix Contact Original Model: QUINT-PS-100-240AC/24DC/10A

AC Input: 100~240VAC 50/60Hz, maximum input current: 3.2A

Input Voltage Tolerance Range: Adaptive for wide range of 85VAC~264VAC

Power Factor: ≥0.95 (Active PFC)

Rated DC Output: 24VDC/10A, rated power: 240W

Output Voltage Adjustable Range: 22.5VDC ~ 28.5VDC

Voltage Regulation Accuracy: ±1% full-load steady-state accuracy

Load Transient Response Time: ≤100ms

Protection Modes: Input undervoltage, input overvoltage, output OVP, output OCP, automatic short-circuit hiccup protection, OTP overtemperature shutdown

Maximum Parallel Quantity: Up to 8 identical units can operate in parallel with current sharing

Dielectric Withstand Voltage: 2300VAC between input & output, input & ground; 500VAC between output & ground

2. Mechanical Parameters

Mounting Method: Vertical snap-on installation on standard 35mm DIN rail

Overall Dimensions: 125mm (W) × 130mm (H) × 110mm (D)

Net Weight: 1.15kg

Terminal Type: Spring anti-loose screw terminals, compatible with 0.5~2.5mm² copper cables

Cooling Mode: Natural convection cooling via aluminum alloy housing, fanless design

3. Environmental Specifications

Normal Operating Ambient Temperature: -20℃ ~ +60℃ (full load within 45℃; derated operation up to 60℃)

Storage & Transportation Temperature: -40℃ ~ +85℃

Operating Humidity: 5%~95% RH, non-condensing, free of corrosive gas and conductive dust

Vibration Standard: IEC 60068-2-6, capable of withstanding conventional vibration conditions of generator units

III. Key Features

Stable DC Power Supply for Control Systems

It converts single-phase industrial AC into high-precision regulated 24VDC power to provide uninterrupted control power for Mark VIe controllers, I/O acquisition cards, industrial switches and field transmitter terminal blocks, avoiding control logic misoperation and offline module reset faults caused by voltage fluctuations.

Capacity Expansion via Multi-unit Parallel Redundant Power Supply

Relying on the built-in current-sharing circuit, multiple power supplies share the load evenly when connected in parallel. It supports the construction of 1-out-of-2 or 2-out-of-3 redundant power supply loops. Load can be automatically and smoothly transferred to other normal units upon single power supply failure, ensuring uninterrupted operation of the gas turbine control system.

Grid Interference Isolation & Power Quality Optimization

Adopting two-stage EMI filter plus active PFC design, it prevents grid-side harmonics and surges from invading the control loop and avoids harmonic pollution to the plant power grid generated by the power supply itself, guaranteeing measurement accuracy of precision acquisition cards installed in the same cabinet against interference.

Automatic Fault Protection & Visual Status Monitoring

It automatically cuts off output to protect downstream equipment in case of short circuit, overload, overtemperature or abnormal input voltage, and resumes power supply automatically after faults are eliminated. The front-panel DC OK indicator displays real-time operating status for quick positioning of power supply faults.

Adaptive Fine-tuning & Compensation of Output Voltage

The DC output voltage can be adjusted via the front-panel potentiometer to compensate for voltage drops of long-distance power cables and multi-load losses, ensuring the supply voltage of all control modules at the cabinet terminal stays within the rated operating range.

Long-term Stable Power Supply for Severe Industrial Conditions

The fanless sealed dust-proof structure adapts to power station operating environments with heavy dust, extreme temperatures, strong vibration and high electromagnetic interference, delivering reliable power supply for critical safety loops including unit safety interlock, overspeed protection and load regulation.

IV. Working Principle

After single-phase 100~240V mains AC is connected to the power supply input terminals, it first passes through two-stage EMI filter circuits to eliminate grid harmonics, surges and electrostatic interference, then enters the active PFC circuit to reshape distorted AC waveforms into regular input waveforms with high power factor, stabilize the rear-stage bus voltage and reduce grid reactive power loss.

The high-voltage bus voltage is stepped down via a high-frequency isolated inverter transformer, rectified and filtered to output stable 24VDC DC voltage. A precision closed-loop voltage feedback circuit samples the output voltage in real time and dynamically adjusts the high-frequency switching duty cycle to keep the output voltage within the set range under full-load, light-load and sudden load change conditions.

When multiple power supplies operate in parallel, the built-in current-sharing controller samples the output current of each unit in real time and finely adjusts individual output voltages to achieve balanced load distribution. During operation, the input voltage, output current and temperature of internal power devices are continuously monitored. Once overvoltage, overcurrent, short-circuit or overtemperature faults occur, the control circuit immediately shuts down the high-frequency conversion loop and enters hiccup protection mode with the DC OK indicator off. The power supply restarts automatically to restore regulated output after faults are cleared.

The precision front-panel potentiometer adjusts the voltage feedback reference value to continuously fine-tune the output voltage from 22.5V to 28.5V, meeting voltage drop compensation requirements for different cable lengths and multi-load operating conditions.

V. Application Scenarios

Mark VIe control systems for thermal power and combined-cycle power plants: Standard 24VDC power supply for controllers, I/O cards and IONET switches inside steam and gas turbine control cabinets, used for building redundant power loops and in-situ replacement of faulty aging power supply modules.
Turbine control systems for compressor units of long-distance oil & gas pipelines: Centralized DC power supply for station gas turbine control cabinets, providing safe and stable power for anti-surge valve control modules, shaft vibration acquisition cards and ESD emergency shutdown loops.
Automation systems for captive power plants in metallurgical and chemical industries: Power capacity expansion and technical upgrading replacement projects for integrated DCS & gas turbine control cabinets of waste heat generator units.
Generator unit control projects for distributed energy and biomass power stations: Deployment of supporting power supply units and spare parts inventory for newly built Mark VIe systems, ensuring reliable power supply for unit grid connection, frequency regulation and safety shutdown control loops.
Retrofit projects for control cabinets of large industrial drive turbine equipment: Power supply system optimization for process drive turbine control systems in fertilizer and refining plants, upgrading single-circuit power supply to dual redundant power supply to improve unit operational safety level.