Sprint Electric SLX5 - 5kW, 12 A Three-Phase 4-Quadrant Regenerative DC Drive
The Sprint Electric SLX5 is a compact, analogue, three-phase regenerative DC drive designed for precise torque and speed control of DC motors up to 5 kW and 12 A. As part of the Sprint Electric SLX range, it uses a fully regenerative four-quadrant topology in order to provide controlled monitoring and braking in both directions.
For UK industrial applications where a DC motor already forms part of a machine, the SLX5 can provide a practical replacement or upgrade path for older analogue DC controllers while retaining the advantages of a differently controlled DC motor system.
Industrial Motor Warehouse supplies the Sprint Electric SLX5 from UK stock with technical support, making it suitable for OEMs, machine builders, maintenance engineers, and industrial users requiring dependable DC motor control.
Sprint Electric SLX5 Key Specifications
| Specification | Sprint Electric SLX5 |
|---|---|
| Drive type | Analogue DC thyristor drive |
| Quadrant operation | 4-quadrant |
| Regeneration | Fully regenerative |
| Input supply | 200–240 V / 380–480 V AC |
| Input frequency | 50/60 Hz |
| Input phase | Three phase |
| Rated DC armature current | 12 A |
| Rated motor power | Up to 5 kW |
| Approximate equivalent horsepower | 6.6 HP |
| Field output | Up to 5 A standard; higher-current field options available |
| Control | Analogue |
| Motor type | DC motor |
| Field weakening | Integral |
| Mounting | Panel mount |
| Ambient rating | 40°C |
| Cooling | Forced ventilation |
What is a Regenerative DC Drive?
A regenerative DC drive controls a DC motor while allowing electrical energy generated during braking or overhauling operation to flow back through the converter towards the AC supply.
This is fundamentally different from a conventional two-quadrant drive, where the drive can control forward and reverse torque only within a more limited operating arrangement, or where braking energy must be dissipated elsewhere.
The SLX5 is a 4 quadrant DC drive, meaning it can control the torque and speed of the motor across four operating quadrants.
| Quadrant | Motor Speed | Motor Torque | Operating Condition |
|---|---|---|---|
| I | + | + | Forward motoring |
| II | + | - | Forward regenerative braking |
| III | - | - | Reverse motoring |
| IV | - | + | Reverse regenerative braking |
Why is Four-Quadrant Control Important?
In applications like winding machinery, conveyors, machine tools, and material-handling systems, the motor may repeatedly transition between braking and motoring.
A regenerative DC motor controller can manage these transitions electronically rather than depending solely on mechanical braking or resistive energy dissipation.
For example, when a motor is driving an overhauling load and the commanded speed is reduced, the motor can operate as a generator. The regenerative converter controls this generated energy and returns it to the AC supply, subject to the operating conditions and installation requirements of the drive.
Spring Electric SLX5 as a DC Thyristor Drive
The SLX5 is an analogue DC thyristor drive. Thyristor-based converters remain relevant in industrial environments where robust control of existing DC motors is more important than replacing the whole motor-drive system with an AC inverter.
A thyristor converter controls the average DC voltage that is supplied to the armature of the motor by controlling the firing angle of the semiconductor devices.
For a three-phase fully controlled bridge, the idealised average DC output relationship is commonly expressed as:
Vdc ≈ 1.35 × Vac × cos α
where:
- Vdc = average converter DC output voltage
- Vac = three-phase AC line-to-line RMS voltage
- α = thyristor firing angle
The SLX’s three-phase topology provides the controlled conversion that is required for industrial DC motor speed and torque control.
Three-Phase Regenerative DC Drive for UK Industrial Systems
The SLX5 is a three phase regenerative DC drive, making it appropriate for industrial installations with compatible three-phase AC supplies.
Its specified supply range covers 200-240 V and 380-480 V AC, making the drive applicable to a range of industrial supply arrangements. The UK industrial environment commonly uses approximately 400 V line-to-line three-phase supplies, subject to the site’s electrical installation and applicable tolerances.
The SLX5 should therefore be selected against the actual incoming supply, motor nameplate data, field requirements, load profile, and protection management rather than simply matching the motor’s nominal kW rating.
In Comparison: SLX5 vs Conventional 2-Quadrant DC Drive
| Feature | SLX5 4Q Regenerative | Conventional 2Q DC Drive |
|---|---|---|
| Forward motoring | Yes | Yes |
| Forward regenerative braking | Yes | Limited/not inherent |
| Reverse motoring | Yes | Depends on system arrangement |
| Reverse regenerative braking | Yes | Limited/not inherent |
| Energy returned to AC supply | Yes, during regenerative operation | Generally no |
| Dynamic reversing | Strong capability | Application dependent |
| Suitable for overhauling loads | Yes | Requires careful braking arrangement |
| Control topology | Three-phase, 4Q regenerative | Typically 2Q |
| Best suited to | Reversing and regenerative machinery | Simpler unidirectional duties |
SLX5 vs. Sprint Electric PLX5
For applications where digital control is preferred, Sprint Electric also offers the PLX family. Industrial Motor Warehouse describes the PLX range as digital, three-phase, four-quadrant fully regenerative DC drives, beginning with the PLX5.
| Characteristics | Spring Electric SLX5 | Sprint Electric PLX5 |
|---|---|---|
| Power class | 5 kW | 5 kW class |
| Rated armature current | 12 A | 12 A class |
| Supply | Three Phase | Three phase |
| Quadrants | 4Q | 4Q |
| Regeneration | Fully regenerative | Fully regenerative |
| Control architecture | Analogue | Digital |
| Field weakening | Integral | Digital control architecture |
| Typical reason to select | Analogue replacement/straightforward integration | Advanced digital control and system integration |
Where Is the Sprint Electric SLX5 Used?
A 5 kW, 12 A four-quadrant regenerative drive is particularly relevant to relatively small industrial DC motor applications where controlled reversing and braking are important.
Potential applications include:
- Machine tools
- Winding and unwinding machinery
- Web-processing equipment
- Conveyors requiring controlled reversing
- Material-handling machinery
- Test stands
- Rollers
- Printing machinery
- Small hoisting or tension-control systems
- Retrofit projects involving existing DC motors
- OEM machinery requiring analogue DC control
Application suitability must be confirmed from the motor and load data. A machine with a high-inertia load or frequent regenerative cycles may need additional engineering considerations even when the nominal power of the motor is within the drive range.
Is the Sprint Electric SLX5 Right for Your Application?
The SLX5 is a strong candidate when you have a DC motor up to approximately 5 kW/ 12 A, a compatible three-phase AC supply, and a requirement for four-quadrant regenerative control.
It is especially worth considering where:
- An existing DC motor is mechanically sound
- The machine needs controlled braking
- Frequent forward/reverse operation is needed
- The load can drive the motor during deceleration
- Regenerative operation is beneficial
- An analogue control system is already installed
- A legacy DC drive needs replacement
- The machine needs field weakening
However, drive selection is always based on motor armature current, armature voltage, field current, supply voltage, load profile, and regenerative duty, not motor kW alone.
Buy Sprint Electric SLX5 in the UK
The Sprint Electric SLX5 combines a 5 kW/12 A rating with three phase input, four-quadrant regenerative operation, analogue control and integral field weakening. It is a technically capable option for UK industrial DC motor applications where controlled torque, speed, reversing and regenerative braking are required.
Industrial Motor Warehouse lists the SLX5 as a 5 kW, 12 A, 4Q, three phase regenerative DC drive and supplies Sprint Electric products with UK technical support.
Need help selecting the correct DC drive? Compare the motor’s armature voltage, armature current, field current, supply voltage, and application duty with the SLX5 specification before ordering. If you are replacing an obsolete DC controller, contact Industrial Motor Warehouse for expert technical guidance on selecting a compatible Sprint Electric Drive.