Lenze 492_E_1 492 E 1 Dynamic Braking Chopper Module
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Product Information
The Lenze 492E1 (Model 492 E 1) is an autonomous dynamic braking chopper module belonging to the Lenze Bremsmodule family and 492 series. Designed for variable frequency drive systems operating across a DC link voltage range of 270 V DC to 780 V DC, this component protects frequency inverters from tripping on overvoltage during rapid deceleration, emergency stops, or overhauling load conditions. When regenerative energy returned by decelerating motors causes the DC bus voltage to reach the 765 V DC threshold, the internal semiconductor chopper activates instantly. Handling a maximum peak braking current of 20 A, the module provides short-time peak power dissipation up to 15 kW and continuous power dissipation up to 1.5 kW.
Interfacing the module into a drive system requires direct power connection to the drive DC link terminals (+UG and -UG). Strict adherence to terminal polarity is mandatory during installation to avoid hardware damage. The module functions entirely on hardware switching logic and operates without software, parameters, or digital programming, making physical substitution straightforward. The unit must be paired with an external braking resistor having a minimum resistance of 27 Ohms to dissipate the diverted energy safely. A potential-free relay contact output provides direct hardware integration into safety chains, line contactor circuits, or drive enable lines. ABC Industrial Parts supports plant maintenance teams in sourcing tested replacement units to keep active machinery running without major system redesigns.
Operational monitoring is available on the module via three front-panel status LEDs. The Ready (Bereit) indicator confirms active DC bus connection and internal control power, while the Braking (Impuls) indicator illuminates when energy is actively shunted into the external resistor. A Fault (Störung) state signals that an overtemperature condition or external thermal contact trip has occurred, opening the potential-free relay contact to isolate the drive. If internal component failures occur within the module power electronics, selecting a replacement or tested exchange unit through ABC Industrial Parts provides a fast route back to full production.
Technical Specifications
| Manufacturer | Lenze |
| Part number | 492_E_1 |
| Model / Type | 492 E 1 |
| Component type | Dynamic Braking Chopper Module |
| Product family | Bremsmodule |
| Minimum DC link voltage | 270 V DC |
| Maximum DC link voltage | 780 V DC |
| Braking voltage threshold | 765 V DC |
| Peak braking current | 20 A |
| Minimum braking resistance | 27 Ohm |
| Continuous braking power | 1.5 kW |
| Peak braking power | 15 kW |
Diagnostics and Status Indication
The Lenze 492E1 dynamic braking module features integrated front-panel LED indicators that deliver real-time visual diagnostics for operational states and fault conditions. These indicators allow maintenance technicians to verify DC link connection status, active power dissipation, and thermal trip conditions directly at the hardware level.
In addition to visual indicators, the module incorporates a potential-free relay contact output. On an overtemperature fault or open thermal contact circuit, the contact opens automatically. This hardware signal can be wired into a master safety circuit, line contactor drop-out loop, or inverter enable line to stop drive operation immediately during thermal overload conditions.
Status LED Indicators
| LED | Color/Status | Meaning |
|---|---|---|
| Ready / Bereit | Solid | DC link voltage present and internal control power active; module ready for operation. |
| Braking / Impuls | Active | Chopper transistor active; energy being dissipated into external braking resistor. |
| Fault / Störung | Solid | Overtemperature or thermal trip triggered; internal thermal overload or external thermal contact open circuit. |
Replacement and Spare Part Considerations
When replacing a Lenze 492E1 dynamic braking module, terminal wiring correctness is paramount. Power connections must be attached to the drive DC link with strict attention to terminal polarity (+UG and -UG). Reversing DC link polarity will cause severe hardware damage to the internal semiconductor switching stage.
Verified electrical compatibility with the connected external braking resistor must be maintained. The resistor must feature an ohmic resistance of at least 27 Ohms to limit braking current to safe operating levels. Resistors below this threshold risk tripping or damaging the module transistor during dynamic braking events.
Although the legacy Type 492 series is discontinued, maintaining functional units remains vital for packaging, material handling, and textile applications. When undertaking broader system modernizations, Lenze EMB8250 and EMB9350 series brake modules serve as recommended retrofit solutions.
Frequently Asked Questions
What is the primary function of the Lenze 492_E_1 dynamic braking module?
The Lenze 492E1 acts as an autonomous DC link braking chopper. It monitors drive bus voltage and automatically diverts regenerative energy produced during motor deceleration into an external power resistor when the voltage exceeds 765 V DC.
Does the Lenze 492_E_1 require software configuration or digital parameters?
No. The module operates entirely on fixed hardware voltage switching thresholds and contains no software, memory cards, or digital parameters. Replacement units require only correct physical installation and wiring.
What external braking resistor specification is required for the Lenze 492_E_1?
The connected external braking resistor must have a minimum resistance of 27 Ohms. Operating with a lower resistance value will exceed the peak braking current threshold of 20 A and risk damaging the chopper module.
How do I identify a thermal overload trip on the module?
A thermal overload or open thermal contact circuit triggers the illuminated Fault / Störung status LED on the front panel and causes the internal potential-free fault relay contact to open.
What recommended retrofits exist for the discontinued Lenze 492 series?
Lenze EMB8250 and EMB9350 series brake modules are recommended retrofits when upgrading drive systems built around discontinued 492 series braking units.
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Specific firmware and hardware versions
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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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