Lenze 13330398 EMB9351-E Brake Chopper Module
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Product Information
The Lenze 13330398 EMB9351-E is an external brake chopper module designed for dynamic energy management in Lenze 9300 series servo inverters and frequency inverters. Operating at a switching threshold voltage of 765 V DC with a maximum DC bus rating of 800 V DC, this module protects drive electronics against overvoltage faults caused by high-inertia dynamic motor loads and rapid motor deceleration cycles. The unit safely channels surplus regenerative energy to an external braking resistor rated at a minimum resistance of 27 Ohms, delivering up to 1.5 kW of continuous braking power and supporting short-duration energy bursts up to 12 kW peak power.
Power connections and brake resistor wiring are established through dedicated screw terminals, with terminals +UG and -UG serving as the DC bus connection and terminals RB1 and RB2 connecting directly to the external brake resistor. Commissioning a replacement unit is straightforward, as the EMB9351-E operates as a pure hardware device that requires no parameter adjustment, firmware loading, or software programming. When replacing a failed module, maintenance teams only need to verify correct terminal polarity and confirm that the external resistor meets or exceeds the 27 Ohm minimum threshold. ABC Industrial Parts supports facilities requiring replacement units to restore machine uptime without complex commissioning routines.
Visual diagnostics on the front face simplify status verification during operation and troubleshooting. A green Ready LED confirms that DC link voltage is present and operational, a yellow Active / BR LED indicates active chopper circuit firing into the brake resistor, and a red Fault / Temp LED flags internal heat sink overtemperature or overload conditions. Additional thermal protection is integrated via signal terminals T1 and T2, which evaluate thermal relay contact state to trip line contactors or signal PLC safety loops during overtemperature events. When internal thermal or hardware faults prevent module operation, ABC Industrial Parts provides tested replacement units and repair options to minimize production downtime.
Technical Specifications
| Manufacturer | Lenze |
| Part Number | 13330398 |
| Model / Type | EMB9351-E |
| Component Type | Brake Chopper Module |
| Product Family | 9300 Series |
| Maximum DC Bus Voltage | 800 V DC |
| Switching Threshold Voltage | 765 V DC |
| Continuous Braking Power | 1.5 kW |
| Peak Braking Power | 12 kW |
| Minimum Brake Resistance | 27 Ohm |
| DC Bus Connection | Screw terminals (+UG, -UG) |
| Brake Resistor Connection | Screw terminals (RB1, RB2) |
| Thermal Monitoring Contact | NC/NO Contact (T1, T2) |
Diagnostics and Status Indication
The Lenze 13330398 EMB9351-E brake chopper module features three front-panel status LEDs that provide visual monitoring of operating states, active discharge cycles, and thermal conditions.
In addition to the visual status LEDs, the module incorporates potential-free thermal monitoring terminals labeled T1 and T2. These terminals connect to an internal thermal evaluation circuit that opens or closes a contact during overtemperature conditions, allowing direct integration into drive enable chains, safety circuits, or main contactor control loops to safely interrupt machine operation.
Status LED Indicators
| LED | Color/Status | Meaning |
|---|---|---|
| Ready | Green - Solid | DC link supply voltage is present and module is operational |
| Active / BR | Yellow - Solid / Flashing | Brake chopper circuit is actively firing and sending current to external brake resistor |
| Fault / Temp | Red - Solid | Internal heat sink overtemperature or overload condition |
Replacement and Spare Part Considerations
Replacing a Lenze 13330398 EMB9351-E module requires verifying physical terminal connections and power parameters before putting the spare unit into service. Because the module performs brake chopper switching entirely via hardware thresholds, no software tools, memory transfers, or parameter downloads are required.
When installing a spare module, ensure that the DC link wiring connected to screw terminals +UG and -UG maintains correct polarity and tight terminal torque. Verify that the connected braking resistor across terminals RB1 and RB2 has a total resistance of at least 27 Ohms. Connecting a resistor with a resistance value below 27 Ohms can overload the chopper switching circuit during high-load braking bursts.
Ensure that the thermal monitoring terminals T1 and T2 are correctly wired into the control circuit. Proper connection of the T1/T2 signal loop ensures that any overtemperature condition in the heat sink immediately signals the upstream control system or line contactor to protect both the drive and the brake chopper unit from thermal damage.
Frequently Asked Questions
Does the Lenze 13330398 EMB9351-E require software programming?
No, the EMB9351-E operates purely on hardware control circuit switching at a fixed 765 V DC threshold and requires no software parameter configuration or programming.
Which drive series is the EMB9351-E compatible with?
The EMB9351-E brake chopper module is designed for use with Lenze 9300 series servo inverters and 9300 series frequency inverters.
What is the minimum brake resistance required for the EMB9351-E?
The external braking resistor connected to terminals RB1 and RB2 must have a minimum resistance rating of 27 Ohms.
How do the thermal monitoring terminals T1 and T2 work?
Terminals T1 and T2 provide a potential-free thermal contact that changes state when an internal heat sink overtemperature or overload condition occurs, allowing connection to line contactors or PLC safety chains to trip the drive system.
What do the status LEDs on the EMB9351-E front panel mean?
The green Ready LED indicates DC bus voltage is present, the yellow Active / BR LED indicates the chopper circuit is actively transferring power to the brake resistor, and the red Fault / Temp LED flags an internal heat sink overtemperature fault.
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Disclaimer:
We are not an authorised distributor of Lenze.
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