Lenze 329169 7813.2 Dynamic Braking Chopper Module
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Product Information
The Lenze 329169, type designation 7813.2, is a dynamic braking chopper module belonging to the 781x Series. Designed for installation in variable frequency drive systems operating on 400 V or 480 V AC mains, this panel- or cabinet-mounted unit limits intermediate DC bus overvoltage conditions caused by regenerative energy during rapid motor deceleration, emergency stops, or overhauling industrial loads. The module operates across a DC bus voltage range of 270 V DC to 770 V DC and engages its chopper circuit at an activation threshold of 770 V DC. It provides a peak braking power capacity of 13.5 kW with a peak switching current of 17.5 A, as well as a continuous braking power rating of 1.35 kW at a 10% duty cycle.
Physical connection to the drive system and braking load is established through the +UG, -UG, and RB power terminals. Putting a replacement 7813.2 unit into service requires verifying hardware setup rather than uploading software parameters. Hardware DIP switches and internal jumpers allow straightforward parameter selection and voltage threshold adjustments directly on the device. When installing a replacement module, maintenance personnel must confirm correct DC bus terminal polarity, proper jumper configuration, and compliance with the minimum external braking resistance requirement of 44 Ohms. Expert technicians at ABC Industrial Parts can assist in verifying hardware configuration and selecting compatible replacement units for existing drive setups.
Diagnostic feedback is provided directly on the front panel via status LED indicators. A solid Ready LED signals that DC bus supply voltage is present and the module is operational, while the Braking indicator switches actively during current diversion to the braking resistor. A solid or flashing Fault LED alerts operators to thermal overload conditions above a 90°C heatsink threshold or internal hardware failures. An integrated thermal fault relay contact allows for system safety interlocks, enabling upstream line contactors to trip and prevent external resistor damage during sustained overtemperature conditions. If internal hardware faults occur, component-level repairs or a fully tested exchange module from ABC Industrial Parts offer a rapid path to restoring machine operation.
Technical Specifications
| Manufacturer | Lenze |
| Part Number | 329169 |
| Model / Type | 7813.2 |
| Component Type | Dynamic Braking Chopper Module |
| Product Family | 781x Series Dynamic Braking Modules |
| Minimum Supply Voltage | 270 V DC |
| Maximum Supply Voltage | 770 V DC |
| Switching Voltage Threshold | 770 V DC |
| Peak Braking Power | 13.5 kW |
| Continuous Braking Power | 1.35 kW |
| Maximum Output Current | 17.5 A |
| Minimum Braking Resistance | 44 Ohm |
| Mounting Type | Panel / Cabinet Mounting |
Programming and Configuration
The Lenze 329169 (7813.2) dynamic braking module does not require external programming software or handheld parameterization tools for setup. Configuration is handled entirely through hardware switches and jumpers located on the module itself.
Internal jumpers and DIP switches allow technicians to adjust operating parameter selections and switching voltage thresholds to match system requirements. When commissioning a spare or replacement unit, the jumper positions on the replacement unit must be set to match the hardware settings of the original module to ensure proper activation at 770 V DC.
Diagnostics and Status Indication
Visual status indication on the front panel allows technicians to monitor operational status without external tools. Three LED indicators provide immediate feedback regarding power presence, active switching, and trip conditions.
In addition to visual LEDs, the 7813.2 includes an integrated thermal fault relay output for automated interlock monitoring. The internal thermal sensor trips if the heatsink temperature exceeds 90°C, opening the fault relay contact. Wiring this contact into the upstream line contactor control circuit protects external braking resistors from thermal runaway caused by prolonged braking or internal chopper failures.
Status LED Indicators
| LED | Color/Status | Meaning |
|---|---|---|
| Ready / Bereit | Solid | DC bus supply voltage present and unit ready for operation |
| Braking / Impuls | Active / Switching | Chopper active / switching current to braking resistor |
| Fault / Störung | Solid / Flashing | Overtemperature trip (>90°C heatsink temp) or internal hardware fault |
Replacement and Spare Part Considerations
When replacing an existing Lenze 329169 or Type 7813.2 chopper unit, verify that the external braking resistor has a resistance value of at least 44 Ohms. Connecting a resistor with lower resistance can lead to overcurrent conditions that exceed the maximum peak switching current rating of 17.5 A.
Ensure correct wiring to the +UG, -UG, and RB power terminals before energizing the drive system. Reversing DC bus polarity (+UG and -UG) will result in component damage. Ensure the hardware DIP switch and jumper settings on the replacement module mirror those of the removed unit.
The 7813.2 module serves as a direct replacement component across legacy Lenze 781x series drive installations and relevant Lenze EMB8251-E and EMB8252-E series applications. Verifying thermal relay interlock connections prevents thermal resistor damage during operation.
Frequently Asked Questions
What software is required to configure the Lenze 329169 braking module?
No software is required. Parameter selection and voltage threshold configuration are handled entirely using hardware DIP switches and internal jumpers on the unit.
What is the minimum external braking resistance allowed for the Lenze 7813.2?
The module requires an external braking resistor with a minimum resistance of 44 Ohms to operate safely within its peak switching current limit of 17.5 A.
At what voltage threshold does the dynamic braking chopper activate?
The module's switching circuit activates when the DC bus voltage reaches 770 V DC, diverting excess regenerative energy to the connected resistor.
What do the Fault LED and thermal relay indicate on the 7813.2 module?
The Fault LED illuminates solid or flashing when the heatsink temperature exceeds 90°C or when an internal hardware fault occurs. The thermal fault relay opens to allow upstream line contactors to trip and prevent resistor overheating.
What power rating can the Lenze 329169 dynamic braking module absorb?
The unit handles a peak braking power of 13.5 kW and has a continuous power dissipation capacity of 1.35 kW at a 10% duty cycle.
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Disclaimer:
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