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- Emerson
- VE5128
- Bulk Power Supply
- USA
- 123 × 180 × 122 mm
- 2.8 kg
- Xiamen, China
- New & In Stock
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Product Overview
The Emerson VE5128 DeltaV Bulk Power Supply converts an AC input into regulated 24 V DC power for industrial control equipment and field devices. With a rated output of 40 A and 960 W, it supports applications with a higher DC power demand than the lower-current DeltaV bulk supply models.
In a process control cabinet, the VE5128 can supply power to groups of instruments, interface equipment, and other 24 V DC loads. Its output voltage adjustment range allows the supply to be set according to the requirements of the connected equipment and the voltage drop across distribution wiring. The unit also includes power-factor correction and output monitoring features for integration into an industrial power arrangement.
The VE5128 is suited to installations where power distribution, load capacity, and cabinet space must be considered together. Its dimensions of 123 × 180 × 122 mm and weight of 2.8 kg are useful when checking mounting clearance, cabinet layout, and replacement-unit fit.
Technical Specifications
| Parameter | Specification |
|---|---|
| Brand | Emerson |
| Model | VE5128 |
| Product Type | DeltaV Bulk Power Supply |
| Product Series | DeltaV |
| Input Type | AC |
| Nominal AC Input Voltage | 100–240 V AC |
| AC Input Voltage Range | 85–264 V AC |
| AC Mains Frequency | 43–67 Hz |
| Output Voltage | 24 V DC |
| Output Voltage Adjustment Range | 23.5–28.5 V DC |
| Rated Output Current | 40 A |
| Continuous Output Power | 960 W |
| Peak Output Power | 1,440 W for 4 seconds |
| Output Ripple | Less than 200 mV peak-to-peak |
| Typical Efficiency | Greater than 93% |
| Power Factor | Typically 0.98 at 115 V AC; 0.92 at 230 V AC |
| Output Hold-Up Time | Greater than 20 ms at full load under specified input conditions |
| Dimensions | 123 × 180 × 122 mm |
| Weight | 2.8 kg |
Product Features
- High-current 24 V DC output: The 40 A rating supports control cabinets with substantial combined DC loads.
- 960 W continuous power capacity: Provides a power source for multiple connected devices within the supply’s rated operating limits.
- Adjustable output voltage: The 23.5–28.5 V DC adjustment range accommodates different distribution and equipment requirements.
- Wide AC input range: Accepts 85–264 V AC, supporting a range of industrial power conditions.
- Power-factor correction: Active power-factor correction helps manage the electrical characteristics of the AC input.
- Short-duration overload capability: Supports a specified higher output for a limited period, subject to the applicable operating conditions.
- Output monitoring: A DC status signal or alarm contact can be used in power-status monitoring arrangements where supported by the installed configuration.
- Industrial cabinet installation: Its defined enclosure dimensions allow engineers to plan mounting space and wiring access.
Working Principle
The VE5128 receives AC power and converts it into regulated 24 V DC through its internal power-conversion circuitry. The output voltage can be adjusted within the specified range to suit the connected load and distribution arrangement. Power-factor correction operates on the input side, while output regulation maintains the DC supply within its operating limits as load conditions change.
In a typical installation, the DC output is routed to distribution terminals or protective devices before reaching field instruments, control interfaces, and other cabinet loads. The supply’s status output can be incorporated into an alarm or monitoring circuit to help identify a loss of normal output status.
Power flow: AC input → input conditioning and power conversion → regulated 24 V DC output → DC distribution → control and field devices.
Role in a DeltaV Control Architecture
Within an industrial control system, the VE5128 functions as a bulk DC power source rather than as a controller or communication module. It supplies electrical power to downstream equipment through the cabinet’s DC distribution network. The controller, I/O modules, field instruments, and interface devices continue to perform their own control or signal-processing functions; the power supply supports their operation by maintaining the required DC power.
A high-current supply is particularly relevant when the total load includes multiple instruments or interface devices. Load calculations should include normal operating current, startup demand, wiring losses, and any allowance required for future expansion. Where a process requires power redundancy, the overall architecture must include a suitable redundancy arrangement rather than assuming that a single VE5128 provides redundant operation.
| System Element | Role in the Architecture |
|---|---|
| AC power source | Supplies the incoming electrical power to the VE5128 |
| VE5128 bulk power supply | Converts AC input into regulated 24 V DC |
| DC distribution terminals | Route the output to individual branches and loads |
| Branch protection | Protects downstream wiring and circuits according to the system design |
| DeltaV controllers and I/O equipment | Execute control logic and process input/output signals when supplied by their required power sources |
| Field instruments and interface devices | Use the distributed DC power for measurement, signaling, or interfacing |
| Alarm or status monitoring circuit | Monitors the power supply’s available status signal or contact |
Industrial Applications
| Application | How the VE5128 Is Used |
|---|---|
| Process control cabinets | Supplies 24 V DC to groups of control and interface devices |
| Oil and gas facilities | Supports DC power distribution for suitable instrumentation and control loads |
| Chemical processing plants | Supplies cabinet-mounted equipment used for process monitoring and control |
| Water and wastewater treatment | Powers compatible instruments and control-interface equipment |
| Power and utility installations | Supports auxiliary DC loads in industrial monitoring and control cabinets |
| Manufacturing lines | Supplies power to compatible sensors, interface devices, and automation accessories |
| Distributed control system installations | Acts as a bulk DC source within the wider control-system power arrangement |
| System expansion projects | Adds power capacity where load calculations show that an additional supply is required |
Installation and Maintenance
- Verify the model identification: Confirm that the unit is VE5128 and that its output rating matches the intended installation.
- Check the input supply: Ensure that the incoming AC voltage and frequency fall within the specified operating range.
- Calculate the connected load: Confirm that the continuous current and power demand remain within the supply’s rated capacity.
- Plan cabinet space: Allow for the unit’s 123 × 180 × 122 mm dimensions and the clearance required for wiring, ventilation, and maintenance access.
- Confirm mounting suitability: Use a mounting arrangement appropriate for the equipment and the cabinet’s mechanical layout.
- Follow electrical isolation procedures: Disconnect and verify the absence of hazardous input power before wiring or servicing the unit.
- Check input and output wiring: Use conductors and terminals suitable for the circuit current, installation conditions, and applicable electrical requirements.
- Observe polarity: Verify positive and negative DC connections before energizing connected equipment.
- Set the output voltage: Adjust the DC output within the permitted range only when required by the connected equipment and installation design.
- Check load distribution: Review branch currents and wiring voltage drop to avoid overloading the supply or individual distribution circuits.
- Monitor operating conditions: Investigate abnormal status indications, excessive temperature, unexpected output variation, or repeated overload conditions.
- Inspect during scheduled maintenance: Check terminal tightness, wiring condition, ventilation paths, mounting security, and the condition of connected distribution components.
Related Components
| Component | Function |
|---|---|
| AC input protection device | Provides upstream protection and isolation appropriate to the installation |
| 24 V DC distribution terminals | Distribute the supply output to individual circuits |
| Branch circuit protection | Protects downstream wiring and connected loads |
| DC-powered field instruments | Use the regulated output where their electrical ratings are compatible |
| Control and I/O interface equipment | Receives DC power according to its own supply requirements |
| Power status monitoring circuit | Uses an available supply status signal or alarm contact to indicate power conditions |
| Redundancy or power-sharing equipment | Supports a redundant power arrangement when the overall design and selected components are compatible |
Recommended Related Models
| Model | Product Description | Typical Use |
|---|---|---|
| VE5123 | DeltaV Bulk Power Supply, 24 V DC, 10 A | Lower-current DC power requirements |
| VE5138 | DeltaV Bulk Power Supply, 24 V DC, 5 A | Smaller loads and lower-power installations |
| VE5126 | DeltaV Bulk Power Supply, 24 V DC, 20 A | Applications requiring an intermediate current rating |
| VE5129 | DeltaV Bulk Power Supply, 24 V DC, 40 A, conformal coating | Related 40 A model with conformal coating |
| VE5127 | DeltaV Bulk Power Supply, 24 V DC, 20 A, conformal coating | Lower-current option with conformal coating |
Key Advantages
- High output capacity: Supplies up to 40 A and 960 W continuously for suitable DC loads.
- Adjustable DC output: Allows voltage adjustment within the specified operating range.
- Broad AC input tolerance: Supports a wide range of incoming AC voltage conditions.
- Power conversion efficiency: Typical efficiency above 93% helps limit conversion losses under specified conditions.
- Practical cabinet integration: Defined physical dimensions support installation planning and equipment replacement.
- Status monitoring capability: An available status output can support power-condition monitoring in the wider control system.
Technical FAQs
What should be checked before replacing a VE5128?
Confirm the model number, output voltage, current and power requirements, input supply range, terminal arrangement, mounting dimensions, and status-signal wiring. A replacement should also be assessed against the existing cabinet’s protection and distribution design.
How much load can the VE5128 support continuously?
The supply is rated for 40 A at 24 V DC, equivalent to 960 W continuous output. The total connected load should remain within both limits, with additional consideration given to startup current, ambient temperature, and the requirements of the installation.
When is the adjustable output voltage useful?
The adjustment range of 23.5–28.5 V DC can help accommodate connected-device requirements and voltage drop in DC distribution wiring. The setting must remain within the permissible input range of every connected device.
Does the VE5128 provide power redundancy by itself?
No. A single VE5128 is a power source, not a complete redundant power system. Redundancy requires a compatible system arrangement, suitable additional power equipment, and wiring that supports the required fault-handling behavior.