Siemens 6SE7028-0ES87-2DA1 50 kW Braking Unit
A 50 kW braking unit that transfers regenerative DC-link energy to a matched resistor.
Overview
6SE7028-0ES87-2DA1 is a Siemens SIMOVERT MASTERDRIVES Compact Plus braking unit. Product data identifies 510–650 V DC, 50 kW rated braking power and an IP20 enclosure class.
The unit switches regenerative energy from the DC link into an external resistor. Resistor value, thermal installation, cable route and host voltage are part of selection.
Specs
| Manufacturer | Siemens |
|---|---|
| Exact Model | 6SE7028-0ES87-2DA1 |
| Family | SIMOVERT MASTERDRIVES |
| Product Type | Braking unit |
| Design | Compact Plus |
| DC Link Range | 510–650 V DC |
| AC Class | Three-phase 380–460 V AC |
| Rated Braking Power | 50 kW |
| Protection Class | IP20 |
| Matching Resistance | 8 ohms |
Features
Absorbs regenerative energy during deceleration or overhauling operation.
Protects the DC link by switching energy into an external resistor.
Uses Compact Plus construction for cabinet installation.
Requires matched resistor and compliant heat dissipation.
Applications
- Deceleration duty on documented MASTERDRIVES converters.
- Hoist, centrifuge, conveyor or process loads returning energy to the DC link.
- Legacy drive service with fully documented braking duty and resistor circuit.
Lifecycle
- Record host MLFB, DC-link voltage and braking duty profile.
- Document resistor, resistance, power rating, thermal switch and cable route.
- Verify discharge and absence of voltage before work.
- Test braking under controlled load while monitoring voltage and temperature.
FAQ
Which resistor information is needed for 6SE7028-0ES87-2DA1?
Provide resistance, continuous and peak power, thermal switch, cable length and approved pairing.
Can 6SE7028-0ES87-2DA1 be selected from motor power alone?
No. Confirm voltage, regenerative energy, cycle and resistor thermal capacity.
What cabinet checks matter for 6SE7028-0ES87-2DA1?
Verify IP20 protection, clearances, ventilation, conductors, grounding and heat dissipation.
Why review the DC-link waveform after fitting 6SE7028-0ES87-2DA1?
It confirms correct braking without repeated overvoltage or thermal overload.
What should accompany an urgent 6SE7028-0ES87-2DA1 request?
Send drive and unit labels, resistor data, drawing, fault codes and duty cycle.
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