Lenze 320378 472_E.1 Braking Module
Het item werd toegevoegd aan uw offerteaanvraag
Product Information
The Lenze 320378 (Type 472_E.1) is a panel-mounted DC bus braking module engineered for regenerative energy dissipation in dynamic motor drives. Operating within the Lenze 470 Series and compatible with Lenze 8200 Series frequency inverters, this brake chopper actively monitors the DC link voltage across a range of 270 V DC to 780 V DC. When rapid deceleration ramps generate kinetic feedback energy, the module activates at its factory-configured 760 V DC threshold to protect connected drives from overvoltage shutdowns. Housed in an IP20 enclosure for cabinet wall mounting, it supports peak braking power loads up to 18 kW and continuous dissipation up to 3.5 kW when paired with an external braking resistor.
Integrating a replacement unit into an existing drive cabinet requires verifying electrical connections and hardware switches. The Lenze 320378 connects via standard terminal strips to the inverter DC bus, an external braking resistor with a minimum resistance of 27 Ohms, and control wiring. Onboard DIP switches allow technicians to align hardware settings before applying main power. Replacing an existing unit involves ensuring the external resistor matches circuit specifications and properly configuring the internal DIP switches. When commissioning replacement hardware or recovering drive functionality after a failure, ABC Industrial Parts provides tested exchange units and expert support to keep production lines running smoothly.
Diagnostic feedback is provided directly on the front panel via dual LED indicators and a relay contact output. A green READY / IMPULSE LED illuminates solid when the control circuit is active and flashes during active brake switching pulses. A red TRIP / OVERVOLTAGE LED lights continuously during DC link overvoltage or fault trips. Additionally, an integrated relay contact provides operational state and trip signaling directly to a master PLC or machine controller. First-line troubleshooting involves checking connected resistor wiring, verifying DC bus voltage, and inspecting cabinet ventilation for heatsink thermal limits. If internal hardware degradation occurs, replacing the unit with a verified spare from ABC Industrial Parts offers a fast path to restoring machine operation.
Technical Specifications
| Supply Voltage Range | 270 - 780 V DC |
| Switching Threshold Voltage | 760 V DC |
| Minimum Braking Resistance | 27 Ohm |
| Peak Braking Power | 18 kW |
| Continuous Braking Power | 3.5 kW |
| Ingress Protection Rating | IP20 |
| Mounting Type | Panel / Cabinet Wall |
Programming and Configuration
Onboard hardware configuration for the Lenze 320378 is managed through internal DIP switches, allowing physical adjustments directly on the module without requiring specialized software parameters or external programming tools.
Prior to energizing a replacement braking unit, technicians should match the DIP switch settings with those of the original unit. Proper setup ensures the switching logic operates correctly in tandem with the connected frequency inverter and external load parameters.
Communication and System Integration
The Lenze 320378 connects directly to the DC bus terminals of Lenze 470 and 8200 Series frequency inverters. Wiring is established via standard terminal strip interfaces, ensuring low-impedance connection for rapid energy transfer during braking events.
For automated system monitoring, the module features an integrated relay contact output. This potential-free contact toggles to signal operational readiness or fault trip conditions directly to a higher-level controller or PLC, enabling immediate system shutdown or alarm handling during an overvoltage event.
Diagnostics and Status Indication
Front-panel LED indicators provide real-time status of the control logic and power switching states. In addition to visual indication, the onboard signaling relay offers real-time status feedback to system controls.
Status LED Indicators
| LED | Color/Status | Meaning |
|---|---|---|
| READY / IMPULSE | Green - Solid / Flashing | Green LED indicates control circuit active and ready for operation; flashing indicates active brake switching pulse. |
| TRIP / OVERVOLTAGE | Red - Solid | Red LED indicates fault condition or DC link overvoltage condition. Constant illumination indicates fault shutdown. |
Replacement and Spare Part Considerations
When substituting a Lenze 320378 braking module, ensure the replacement matches part number 320378 and type code 472_E.1. Confirm that the connected external resistor maintains a minimum resistance value of 27 Ohms to prevent overcurrent stress on the internal switching components.
Before powering up the replacement, verify that all DIP switch configurations match the original unit settings and inspect the cabinet environment to guarantee adequate thermal clearance for the integrated heatsink.
Error Codes & Fault Codes
The following error codes may be displayed during operation or diagnostics:
| Code | Name | Description | Possible Cause | Recommended Action |
|---|---|---|---|---|
| OVERVOLTAGE_TRIP | DC Link Overvoltage | DC bus voltage exceeds maximum allowable threshold for the module. | Deceleration ramp too steep, connected external braking resistor open-circuit or disconnected, incorrect resistance value. | Check braking resistor wiring and resistance value; extend deceleration ramp time; verify DC bus voltage levels. |
| OVERTEMPERATURE_TRIP | Heatsink Overtemperature | Internal temperature of the braking module heatsink exceeds safe operating limit. | Inadequate cooling or airflow, excessive continuous braking duty cycle, ambient temperature above limit. | Verify cabinet ventilation; check duty cycle against continuous power rating; inspect heatsink for blockages. |
Frequently Asked Questions
What inverter series are compatible with the Lenze 320378 braking module?
The Lenze 320378 (Type 472_E.1) is compatible with Lenze 470 Series and Lenze 8200 Series frequency inverters.
What is the minimum resistor value required for the Lenze 320378?
The module requires an external braking resistor with a minimum resistance of 27 Ohms.
What do the green and red LEDs on the Lenze 320378 indicate?
The green READY / IMPULSE LED indicates active control circuits when solid and active switching pulses when flashing. The red TRIP / OVERVOLTAGE LED indicates a fault condition or DC link overvoltage when continuously illuminated.
How is the Lenze 320378 configured during replacement?
Configuration is completed via internal DIP switches on the module, requiring manual setting alignment before energizing the device.
What causes an OVERVOLTAGE_TRIP on the Lenze 320378?
Overvoltage trips typically occur when deceleration ramps are too steep, the external braking resistor is disconnected or open-circuit, or the resistance value is incorrect.
Take advantage of our exchange formula
A defective product does not have to be worthless. At ABC Industrial Parts, you can hand in defective products and immediately benefit from a discount on your new purchase. This is a smart way to save money while contributing to a circular economy.
Play it safe with our warranty conditions
Industrial plants prefer to keep running invariably, no matter what. Therefore, it is essential that you can rely on high-quality products and/or sustainable repairs. With our warranty conditions, you can count on certainty, whether you choose new, used or repaired products.
Data backup and recovery
Have you lost valuable parameters or data due to a malfunction while the manufacturer no longer provides support? At ABC Industrial Parts, we help you secure this data, both for common and specific products.
Specific firmware and hardware versions
If you are working with specific hardware or firmware versions that are no longer available from the manufacturer, ABC Industrial Parts is your partner. When making your enquiry, clearly state which versions you need, we will then look at the possibilities of supplying those versions, so that your installations continue to function optimally.
Disclaimer:
We are not an authorised distributor of Lenze.
Product photos are for illustration purposes only and may differ from the actual product delivered.
Some of the content on this page was created with the help of AI. While we strive to provide accurate and up-to-date information, errors may occur.