Lenze 00706404 Resistor 6 Ohm – Braking Resistor 1.2 kW
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Product Information
The Lenze 00706404 is an industrial dynamic braking resistor designed to absorb and dissipate regenerative energy in automated drive systems. Functioning as a high-capacity power accessory within the Lenze Drive Accessories family, this 6 Ohm braking resistor converts electrical energy fed back into the intermediate DC circuit during rapid motor deceleration, quick stops, or overhauling loads into controlled thermal energy. Engineered with a continuous power dissipation rating of 1.2 kW and supporting maximum DC link operating voltages up to 800 V DC, the 00706404 prevents voltage spikes across the drive bus, protecting both the frequency inverter and connected motor components in dynamic industrial machinery.
Integrating a replacement 00706404 resistor requires matching electrical connections to the drive's external brake chopper terminals or intermediate circuit connections. The resistor is designed for direct pairing with Lenze frequency inverters and servo drives equipped with integrated brake choppers requiring a 6 Ohm nominal resistance load. While the resistor itself contains no software or internal parameters, commissioning a spare unit involves verifying that the host drive's brake chopper control parameters are properly configured and that wiring integrity is maintained. Using the exact 6 Ohm specification protects the drive's internal chopper transistors against high-current overload conditions during heavy braking cycles. Maintenance teams sourcing replacement units can count on ABC Industrial Parts for swift availability of fully tested spare components.
In active motion applications across material handling, high-speed packaging, textile manufacturing, and automated assembly, an intact braking resistor is critical to preventing overvoltage drive trips. When a drive experiences repeated DC link overvoltage faults during ramp-down, inspecting the braking resistor connections, checking resistance across the terminals, and evaluating thermal buildup are key initial diagnostic steps. Because braking resistors operate under elevated thermal conditions, mounting location and safe thermal clearance from heat-sensitive panel components are essential for reliable service life. If the resistor suffers thermal fatigue or an open-circuit failure, replacing the module with an identical unit restored through ABC Industrial Parts ensures immediate return to full operational duty without risking drive damage.
Technical Specifications
| Manufacturer | Lenze |
| Part Number | 00706404 |
| Model / Type | Resistor 6 Ohm |
| Component Type | Braking Resistor |
| Product Family | Drive Accessories |
| Nominal Resistance | 6 Ohm |
| Continuous Power Rating | 1.2 kW |
| Maximum DC Link Voltage | 800 V DC |
Replacement and Spare Part Considerations
When replacing the Lenze 00706404 braking resistor, matching the exact electrical characteristics is mandatory to ensure drive system stability and hardware safety. The 6 Ohm nominal resistance is specifically selected to suit the current limits of the drive's internal brake chopper transistor. Installing a resistor with lower resistance can lead to overcurrent destruction of the chopper transistor, while a higher resistance reduces braking torque and energy absorption capacity, leading to frequent DC link overvoltage shutdowns.
In addition to electrical compatibility, replacement planning must account for physical placement and thermal management. The 00706404 dissipates up to 1.2 kW of continuous thermal power during active braking, generating elevated temperatures during heavy start-stop duty cycles in conveyor systems, packaging equipment, or textile machinery. Replacement units must be installed with sufficient physical separation from temperature-sensitive control wiring, electronic modules, and enclosure walls to allow natural heat dissipation.
Before placing a new or replacement braking resistor into service, technicians should verify wiring continuity across the brake chopper terminals and confirm that the drive parameters for external brake resistor operation are active. Checking that maximum operating limits do not exceed 800 V DC ensures safe integration across compatible Lenze frequency inverters and servo drive architectures.
Frequently Asked Questions
What is the primary function of the Lenze 00706404 braking resistor?
The Lenze 00706404 braking resistor absorbs regenerative kinetic energy generated by decelerating electric motors and converts it into heat. This prevents intermediate DC link overvoltage trips on connected Lenze frequency inverters and servo drives.
What are the core electrical ratings of the 00706404 dynamic resistor?
The 00706404 features a nominal resistance of 6 Ohms, a continuous power dissipation rating of 1.2 kW, and supports maximum operating voltages up to 800 V DC.
Why must the 6 Ohm resistance value be strictly maintained when replacing this part?
Maintaining the exact 6 Ohm rating protects the internal brake chopper transistor of the drive from current overloads caused by lower resistance, while ensuring adequate braking torque and preventing DC bus overvoltage faults caused by higher resistance.
Which drive systems are compatible with the Lenze 00706404 braking resistor?
The 00706404 is compatible with Lenze frequency inverters and servo drive systems equipped with an integrated brake chopper that requires an external 6 Ohm braking resistor rated up to 800 V DC.
What happens if a braking resistor fails or is disconnected during operation?
If the braking resistor fails open-circuit or is disconnected, regenerative energy cannot be dissipated during motor deceleration. As a result, the drive's DC bus voltage will rise rapidly, causing the inverter to shut down on a DC link overvoltage fault to protect its components.
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