Lenze EMB9352-E Supply and Regenerative Brake Module
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Product Information
The Lenze EMB9352-E is a heavy-duty power supply and regenerative brake module designed for centralized DC link energy distribution in Lenze 9300 multi-axis servo drive applications. Operating across an input voltage range of 320 to 528 V AC with a 24 V DC auxiliary control supply, this unit Rectifies 3-phase AC mains to provide a nominal 565 V DC bus voltage directly to connected drive controllers. Operating at 400 V AC, the module delivers 48 kW of continuous rated power and up to 85 A DC continuous output current, with an increased power rating of 58 kW at 480 V AC (71 A DC continuous). For heavy acceleration and peak dynamic demands, the supply delivers a peak power output of 72 kW and a 128 A DC peak current for up to 15 seconds.
System connectivity and multi-axis synchronization rely on the onboard CAN system bus interface operating at 500 kbps on terminal X4, alongside a versatile expansion slot X1. Slot X1 supports a range of interface cards including the EMZ9371BC operational keypad, EMF2102IB or EMF2111IB LECOM serial adapters, and the EMF2133IB PROFIBUS-DP fieldbus module. Commissioning or installing a spare unit requires parameter alignment using Lenze Global Drive Control (GDC) software or direct parameter copying using the keypad module, as configuration settings are stored in non-volatile onboard EEPROM memory. Connecting external dynamic braking resistors down to a minimum resistance of 4.7 Ohms activates the integrated brake chopper circuit to safely absorb regenerative energy during rapid deceleration cycles. ABC Industrial Parts can assist in sourcing fully tested units to keep your production machinery running smoothly.
Diagnostics and operating conditions are displayed continuously through visual status LEDs, relay alarm terminals, and fieldbus error monitoring. Status indications cover supply readiness, operational state, thermal warnings, and active fault conditions. Terminal X5/A1-A2 provides a dedicated relay output contact that opens immediately upon a fault condition to report trip status to higher-level controllers. If internal control failures, damaged brake chopper circuitry, or unrecoverable EEPROM errors occur, field repairs on internal printed circuit boards are not feasible, making module replacement or professional off-site repair through ABC Industrial Parts the most efficient path back to operational service.
Technical Specifications
| Manufacturer | Lenze |
| Part number | EMB9352-E |
| Model / Type | Supply and Regenerative / Brake Module 9352 |
| Product family | Lenze 9300 |
| Component type | Power Supply Module |
| Supply voltage range | 320 - 528 V AC |
| Auxiliary supply voltage | 24 V DC |
| Rated input current (400V) | 70 A |
| Nominal DC output voltage | 565 V DC |
| Rated power (400V) | 48 kW |
| Rated power (480V) | 58 kW |
| Peak power (15s) | 72 kW |
| Continuous DC output current (400V) | 85 A |
| Continuous DC output current (480V) | 71 A |
| Peak DC output current (15s) | 128 A |
| Minimum brake resistance | 4.7 Ohm |
Programming and Configuration
The Lenze EMB9352-E power supply utilizes non-volatile internal EEPROM memory to store system operational parameters and network configuration data. Setup and configuration are performed using Lenze Global Drive Control (GDC) software connected via a LECOM interface adapter, or directly through the EMZ9371BC plug-in keypad module.
When swapping a module during maintenance, parameters can be cloned directly using the keypad or downloaded from saved GDC project backups. Diagnostic parameters C0168 and C0169 maintain historical fault records for evaluation. In the event of parameter memory corruption, resetting the device to factory defaults is performed by setting code C0002 to 8 and code C0003 to 1.
Communication and System Integration
System integration within a Lenze 9300 multi-axis network is managed through the integrated CAN system bus interface at terminal X4. Running at a transmission speed of 500 kbps, the system bus broadcasts error frames and status signals to synchronised downstream servo drive controllers.
For higher-level PLC connection and system monitoring, slot X1 supports several communication adapters. Options include the EMF2133IB PROFIBUS-DP interface module, INTERBUS communication modules, or EMF2102IB / EMF2111IB LECOM adapters for serial communication. Proper system bus wiring requires installing 120 Ohm termination resistors at both physical ends of the CAN network line.
Diagnostics and Status Indication
Front-mounted LED indicators on the EMB9352-E provide immediate visual feedback on power status, active operations, and fault conditions. Terminal X5/A1-A2 offers a digital relay output contact that opens when a trip condition occurs, signaling external safety monitoring equipment or PLCs.
Detailed trip diagnostic codes are retrieved using the plug-in EMZ9371BC keypad or observed remotely through the GDC software diagnostic monitor. Fault conditions automatically broadcast error frames across the internal CAN system bus to alert all connected 9300 servo drives.
Status LED Indicators
| LED | Color/Status | Meaning |
|---|---|---|
| Ready (Green LED) | Green - Solid / Blinking | Solid green indicates power supply is ready and DC bus is charged. Blinking green indicates unit enabled or active operation. |
| Fault / Trip (Red LED) | Red - Solid / Fast Flashing | Continuous red indicates an active fault (Trip). Fast flashing indicates a serious internal hardware failure. |
| Brake / Warning (Yellow LED) | Yellow - Solid / Pulsing | Warning state or active brake chopper operation. Indicates dynamic brake threshold is reached. |
Replacement and Spare Part Considerations
When replacing an EMB9352-E module in an existing Lenze 9300 control cabinet, ensure the replacement unit matches the exact model number. Verify that the incoming 3-phase AC line voltage (320 to 528 V AC) and 24 V DC auxiliary connections match original system specifications prior to powering up.
Before restoring full machine operation, check that external braking resistors maintain an electrical resistance of at least 4.7 Ohms to prevent overcurrent damage to the integrated brake chopper. Ensure the CAN system bus on terminal X4 retains its 120 Ohm terminating resistors at both ends of the line.
Parameter sets stored in the EEPROM must be transferred to the replacement unit using either Lenze GDC software or the EMZ9371BC keypad. If transferring parameters fails due to memory failure (EER fault), re-initialize defaults using C0002=8 and C0003=1 prior to reloading application settings.
Error Codes & Fault Codes
The following error codes may be displayed during operation or diagnostics:
| Code | Name | Description | Possible Cause | Recommended Action |
|---|---|---|---|---|
| OH | Heatsink Overtemperature | Heatsink temperature exceeds maximum allowed threshold limit (approx. 85°C to 90°C). | Cooling fan failure, clogged heat sink fins, ambient cabinet temperature too high, continuous thermal overload. | Check cabinet ventilation, clean cooling fins, verify cabinet fan functionality, reduce ambient temperature, verify load cycle. |
| OH4 | Heatsink Temperature Warning / Overload | Heatsink thermal threshold pre-warning activated prior to tripping. | High continuous current load, restricted airflow. | Inspect cabinet cooling and thermal load environment. |
| OU | DC Bus Overvoltage | DC link bus voltage exceeded maximum allowable threshold (approx. 800 V DC). | High regenerative energy from connected drives, brake resistor disconnected, damaged brake chopper circuit, brake resistor value too high. | Check external brake resistor wiring and resistance value, inspect internal brake chopper functionality. If internal brake chopper circuit is damaged, return unit for repair. |
| LU | DC Bus Undervoltage | DC link bus voltage fell below minimum voltage threshold (approx. 285 V DC / 430 V DC). | Mains supply phase failure, drop in AC mains line voltage, blown input fuses, main contactor dropped out. | Verify 3-phase AC input voltages at L1, L2, L3 terminals. Check main power contactor and supply fuses. |
| OC1 | Short Circuit / Earth Fault | Instantaneous short circuit or ground fault detected on DC link output or brake resistor connection. | Short circuit in DC bus wiring, earth fault in connected inverter modules, shorted braking resistor. | Check DC bus cable isolation, check external brake resistor for low resistance or short to ground, disconnect drives and megger wiring. |
| OC5 | Ixt Thermal Overload | Continuous thermal load integration (Ixt overload) exceeded limit. | Module operated above rated continuous current (85 A) for prolonged duration. | Reduce connected drive loading, check system power calculations, verify duty cycle requirements. |
| LP | Mains Phase Failure | Asymmetry or loss of one line phase detected on incoming 3-phase AC mains. | One incoming phase fuse blown, loose wire on input power terminals, unbalanced supply grid. | Measure input AC voltage across all three incoming phases (L1-L2, L2-L3, L1-L3). Inspect line fuses and contacts. |
| EER | EEPROM Memory Error | Internal EEPROM memory read or checksum failure during boot or parameter read/write operation. | Corrupted parameter memory, internal control board hardware fault. | Re-initialize parameters to default factory setting (C0002=8, C0003=1). If error persists, internal control hardware fault exists — replace or return unit for repair. |
| CE0 | Communication Error Slot X1 | Communication breakdown between power supply control board and plug-in automation/communication module in slot X1. | Module loose in slot X1, fieldbus cable interrupted, bus master stopped. | Verify seating of communication module in slot X1, check fieldbus wiring and termination. |
| CE4 | System Bus Communication Error (CAN) | Time-out or message collision fault on internal system bus (CAN interface X4). | Interrupted system bus cable, incorrect bus baud rate, missing terminal resistors (120 Ohm) at bus ends. | Check wiring on CAN terminals X4, ensure termination resistors are installed, verify baud rate configuration. |
Frequently Asked Questions
What power rating does the Lenze EMB9352-E deliver?
The Lenze EMB9352-E delivers 48 kW rated power at 400 V AC (85 A DC continuous) and 58 kW at 480 V AC (71 A DC continuous). It supports a peak output power of 72 kW (128 A DC) for up to 15 seconds.
What minimum braking resistance is required for the integrated brake chopper?
The internal dynamic brake chopper circuit requires an external braking resistor with a minimum resistance value of 4.7 Ohms.
How do I transfer parameters to a replacement EMB9352-E module?
Parameters can be copied directly using the EMZ9371BC keypad or uploaded and downloaded using Lenze Global Drive Control (GDC) software via a LECOM adapter.
What causes an EER fault code and how can it be resolved?
An EER error indicates an EEPROM memory read or checksum failure. Reset parameters to default factory settings by setting code C0002 to 8 and code C0003 to 1. If the fault persists, an internal control board hardware fault is present, requiring module repair or replacement.
Which communication modules can be installed in expansion slot X1?
Slot X1 accepts the EMZ9371BC keypad, EMF2102IB or EMF2111IB LECOM serial adapters, the EMF2133IB PROFIBUS-DP module, or INTERBUS communication interfaces.
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