Lenze EMB9351-E 9300 Series Brake Unit Module
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Product Information
The Lenze EMB9351-E is an autonomous standard-design brake unit module belonging to the Lenze 9300 product family. Functioning as a brake chopper within variable frequency drive systems, it protects the common DC bus against overvoltage conditions caused by motor regeneration during active dynamic braking or rapid deceleration. The module operates across a wide DC voltage range from 270 V DC up to 775 V DC, delivering 3 kW continuous braking power and up to 19 kW peak power at a maximum braking current of 28.3 A.
Physical integration is made through dedicated power screw terminals for the DC link connections (+UG, -UG) and the external braking resistor terminals (RB1, RB2), alongside control terminal blocks for enable input signals and fault output evaluation. Putting a spare unit into service requires hardware threshold alignment using onboard DIP switches and configuration jumpers to match the system mains voltage and operating parameters. Selecting a matching external braking resistor with a minimum resistance of 27 Ohms is essential to safeguard internal switching components. ABC Industrial Parts provides technical support to ensure replacement units are configured correctly before powering up the drive system.
Diagnostic feedback is provided via dedicated front-panel LED indicators and an integrated relay output. The Ready / Voltage ON LED remains solid when DC bus power is present, the Brake / Active LED illuminates during energy discharge into the resistor, and the Fault / Overload / Overtemperature LED signals thermal overload or threshold failures. Before putting a replacement online, technicians should verify terminal polarities, confirm resistor ohmic resistance, and check that configuration switches match the failed module. When internal power transistor or logic faults occur, ABC Industrial Parts can supply tested replacement units to restore operations without delay.
Technical Specifications
| Manufacturer | Lenze |
| Part number | EMB9351-E |
| Model / type | 9351 Standard Design |
| Component type | Brake Unit Module |
| Product family | 9300 |
| Supply voltage range | 270 - 775 V DC |
| Continuous braking power | 3 kW |
| Peak braking power | 19 kW |
| Maximum peak braking current | 28.3 A |
| Minimum braking resistance | 27 Ohm |
Programming and Configuration
The Lenze EMB9351-E uses onboard hardware DIP switches and configuration jumpers to establish precise voltage switching thresholds. These settings align the module's activation point with the system mains voltage and DC bus limits.
Control wiring connects through dedicated terminal blocks, providing enable signal input and an integrated relay contact for fault signaling to a host controller or PLC. Because parameter selection relies on hardware jumpers rather than software file downloads, setting up a spare unit requires adjusting physical switches to match the replaced hardware.
Communication and System Integration
The module integrates directly into the drive DC link architecture via dedicated power terminals labeled +UG and -UG. Power output to the external braking resistor connects to terminals RB1 and RB2.
To ensure stable energy dissipation and system safety, the unit must be paired with an external braking resistor rated at a minimum resistance of 27 Ohms. Automated safety feedback is integrated via a dedicated relay contact that signals fault state directly to an upstream PLC or safety circuit.
Diagnostics and Status Indication
Status monitoring on the Lenze EMB9351-E relies on direct visual indicators on the front panel and fault signaling relay contacts. Three LED indicators provide real-time status of line supply presence, switching activity, and thermal or operational fault conditions.
Status LED Indicators
| LED | Color/Status | Meaning |
|---|---|---|
| Ready / Voltage ON | Solid | DC bus voltage is connected and power supplies are operational |
| Brake / Active | Flashing / Active | Braking chopper transistor is actively discharging energy into the resistor |
| Fault / Overload / Overtemperature | Solid | Module thermal overload or operational fault threshold exceeded |
Replacement and Spare Part Considerations
When swapping a failed EMB9351-E brake unit, hardware configuration must be verified prior to energizing the DC bus. Inspect the positions of all onboard DIP switches and jumpers on the existing module to ensure identical voltage threshold settings on the replacement device.
Verify that the external braking resistor remains within specification and meets the 27 Ohm minimum resistance requirement. Confirm correct polarity on the DC link (+UG, -UG) terminals and secure terminal torque to prevent localized overheating during high-peak discharge cycles.
Frequently Asked Questions
What power rating does the Lenze EMB9351-E support?
The Lenze EMB9351-E provides 3 kW continuous braking power and up to 19 kW peak power with a maximum peak braking current of 28.3 A.
What is the minimum braking resistance required for the EMB9351-E?
The external braking resistor connected to terminals RB1 and RB2 must have a resistance of at least 27 Ohms.
How are activation thresholds configured on this module?
Activation thresholds are configured via physical onboard DIP switches and hardware jumpers to match the mains supply voltage of the drive system.
What DC supply voltage range is compatible with the EMB9351-E?
The module operates across a DC input voltage range from 270 V DC up to 775 V DC.
How does the EMB9351-E signal operational faults to a machine controller?
The module features an integrated relay contact output that provides fault evaluation signaling to an external PLC or control system.
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Disclaimer:
We are not an authorised distributor of Lenze.
Product photos are for illustration purposes only and may differ from the actual product delivered.
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