Lenze 00398399 EMB9343-E 9300 Series Brake Module
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Product Information
The Lenze 00398399 EMB9343-E is an external brake chopper module designed for integration with Lenze 9300 Series servo inverters and frequency inverters. Engineered to manage regenerative electrical energy generated during fast motor deceleration, this brake module diverts surplus energy away from the drive DC link into an external braking resistor to prevent overvoltage tripping. The module provides a continuous braking power capability of 35 kW and handles peak impulse loads up to 100 kW. Enclosed in an IP20-rated housing, it operates across a DC bus voltage range of 270 V DC to 785 V DC and automatically initiates chopper action when the bus voltage hits its fixed threshold of 765 V DC.
Integrating a replacement EMB9343-E into an operational drive system involves making connections to the designated heavy-duty screw terminal blocks, identified by terminals +UG, -UG, RB1, and RB2. The module requires a connected external braking resistor with a minimum resistance value of 5.6 Ohms to limit peak pulsed current to 140 A and maintain safe transistor switching. In addition to power connections, the integrated thermal fault relay contact must be integrated into the machine safety loop or main contactor control circuit to trip power upon severe overload. ABC Industrial Parts can assist in supplying tested replacement hardware to help restore dynamic braking performance without costly production interruptions.
Diagnostic monitoring on the front panel is accomplished via three distinct status LEDs that indicate operational readiness, active switching, and active fault states. A solid green Ready LED confirms control supply presence, a flashing or solid yellow Impuls / Braking LED shows active chopper operation, and a solid red Fault LED alerts operators to overtemperature, resistor overload, or hardware malfunctions. When a fault occurs, the internal thermal fault relay contact opens to trigger upstream safety tripping. Hardware faults within the internal circuit board cannot be adjusted or repaired in the field; replacing the unit or securing a tested exchange module through ABC Industrial Parts offers a direct solution to recover production.
Technical Specifications
| Manufacturer | Lenze |
| Part number | 00398399 |
| Model/type | EMB9343-E |
| Component type | Brake Module |
| Product family | 9300 Series |
| Continuous brake power | 35 kW |
| Peak brake power | 100 kW |
| DC bus voltage range | 270 - 785 V DC |
| Switching threshold voltage | 765 V DC |
| Minimum brake resistance | 5.6 Ohm |
| Maximum peak current | 140 A |
| Protection rating | IP20 |
Diagnostics and Status Indication
The EMB9343-E visual feedback system uses three status LEDs on the front panel to convey operational status. The green Ready LED lights solid when the control supply voltage is stable and the unit is prepared for switching. The yellow Impuls / Braking LED flashes or turns solid when the internal transistor actively switches regenerative current to the external resistor. The red Fault LED lights solid during abnormal states such as module overtemperature, resistor overload, or internal hardware faults.
For automated system diagnostics, the module incorporates a thermal fault relay output contact. Under normal working conditions, this contact remains closed to permit drive operation. If an overtemperature event or hardware malfunction occurs, the fault contact opens to trip the line contactor or execute an emergency stop signal on the primary drive controller.
Status LED Indicators
| LED | Color/Status | Meaning |
|---|---|---|
| Ready | Green - Solid | Control supply voltage present and module is ready for operation |
| Impuls / Braking | Yellow - Flashing / Solid | Brake chopper active, switching current to the braking resistor |
| Fault | Red - Solid | Fault condition active (overtemperature, resistor overload, or internal hardware fault) |
Replacement and Spare Part Considerations
Before installing a replacement Lenze 00398399 EMB9343-E module, verify that the external braking resistor matches system specifications and has an Ohm value equal to or greater than 5.6 Ohms. Connecting a resistor below 5.6 Ohms will result in excessive peak currents exceeding the 140 A threshold, which can damage the internal power transistors.
Ensure that the DC bus wiring (+UG and -UG) and external resistor wiring (RB1 and RB2) are cleanly routed and properly torqued into the screw terminals. Additionally, re-establish the connection from the internal thermal fault relay output to the line contactor or main drive trip loop to preserve automatic hardware shutdown features during overload events.
Frequently Asked Questions
What is the function of the Lenze 00398399 EMB9343-E brake module?
The EMB9343-E functions as a brake chopper for Lenze 9300 Series drive systems. It dissipates regenerative energy produced during motor braking into an external braking resistor, protecting the drive DC bus from overvoltage conditions.
At what threshold voltage does the brake chopper start operating?
The module automatically begins switching power to the braking resistor when the drive DC bus voltage reaches 765 V DC, operating within an overall range of 270 V DC to 785 V DC.
What is the minimum resistor value allowed for the EMB9343-E?
The connected external braking resistor must have a minimum resistance of 5.6 Ohms to prevent peak currents from exceeding the maximum rating of 140 A.
What do the three front-panel LEDs indicate?
The green Ready LED indicates control power is available, the yellow Impuls / Braking LED indicates active braking chopper operation, and the red Fault LED indicates an overtemperature condition, resistor overload, or internal failure.
How is the thermal fault relay output used?
The integrated thermal fault relay contact opens during overtemperature or hardware failure states. It is wired into the upstream line contactor or drive trip circuit to safely disconnect power and prevent hardware damage.
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