Lenze 345849 8605_E.3D.44 8600 Series Frequency Inverter 4.0 kW
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Product Information
The Lenze 345849 (Model 8605_E.3D.44) is a 4.0 kW frequency inverter from the Lenze 8600 Series, engineered for precise speed control of three-phase asynchronous AC motors in automated industrial machinery. Operating across an AC supply voltage range of 320 V AC to 528 V AC (nominal 3x 400/480 V AC), this cabinet-mounted inverter draws a rated input current of 12.0 A and delivers a continuous output current of 9.5 A, with a maximum output current of 14.3 A for temporary high-load demands up to 150% overload for 60 seconds. Housed in an IP20 protection enclosure, the unit features an integrated brake transistor designed to manage regenerative energy during fast motor deceleration. Dynamic speed control is achieved using either linear or quadratic V/f characteristic curves or open-loop vector control, with adjustable switching frequencies up to 16 kHz around an 8 kHz standard baseline.
Interfacing and commissioning a spare Lenze 345849 drive require aligning parameter settings and network options with the target production line. The inverter incorporates a front slot designed for plug-in fieldbus option modules, supporting PROFIBUS-DP, CANopen, or Lenze LECOM RS-232 / RS-485 serial communication protocols. Local parameter configuration, tuning, and parameter transfer are carried out using the pluggable operating keypad module 8601.01 or the Lenze Global Drive Control (GDC) PC software suite. When swapping out a drive, configuration sets can be transferred via keypad copy-paste routines or downloaded directly from saved GDC project files. Expert assistance from ABC Industrial Parts is available to help source tested spare drives and guide parameter extraction or restoration during critical replacement procedures.
Real-time operating conditions and diagnostic status are communicated directly through local indicator hardware and software connections. A combined Red/Green status LED provides immediate visual state detection, illuminating solid green during operational readiness, flashing green while running, illuminating solid red upon a TRIP fault state, and flashing red under warning conditions. Detailed TRIP fault codes are readable on the pluggable keypad display, while parameter C0161 in GDC software maintains a complete historical error log, complemented by a physical status relay contact output for remote trip signaling. First-line field checks should verify input phase balance across L1, L2, and L3, cable insulation, and cooling airflow. Unresolvable codes such as OC1 output short circuits or EE EEPROM memory errors indicate internal power stage or control board hardware faults, where testing or unit replacement through ABC Industrial Parts provides the fastest route back to operation.
Technical Specifications
| Manufacturer | Lenze |
| Part Number | 345849 |
| Model / Type | 8605_E.3D.44 |
| Component Type | Frequency Inverter |
| Product Family | 8600 Series |
| Rated Power | 4.0 kW |
| Supply Voltage Range | 320 - 528 V AC |
| Nominal Input Voltage | 3x 400 / 480 V AC |
| Rated Input Current | 12.0 A |
| Continuous Output Current | 9.5 A |
| Maximum Output Current | 14.3 A |
| Output Frequency Range | 0 - 480 Hz |
| Switching Frequency | 8 kHz |
| Control Method | V/f Characteristic / Open-Loop Vector Control |
| Enclosure Protection Rating | IP20 |
| Mounting Type | Control Cabinet Mounting |
Programming and Configuration
Programming and commissioning of the Lenze 345849 frequency inverter are performed using the optional 8601.01 pluggable operating keypad or Lenze Global Drive Control (GDC) PC software. The keypad module provides a clear display interface to navigate parameter menus, adjust speed acceleration and deceleration ramps, configure V/f characteristic curves, and switch to open-loop vector control mode.
When managing parameter sets for multiple machines or preparing a spare drive, GDC software enables comprehensive parameter uploading, editing, and offline storage. Drive parameters can be uploaded directly from an operational unit and saved to a PC file. If internal parameter data becomes corrupted, factory default parameters can be reloaded to re-establish stable operation before applying custom drive settings.
Communication and System Integration
System integration for the Lenze 8600 Series relies on a front expansion slot configured to accept interchangeable communication option modules. Depending on network requirements, the 345849 inverter supports PROFIBUS-DP and CANopen fieldbus interface modules for integration into distributed PLC automation systems.
For direct point-to-point connections or serial network structures, Lenze LECOM RS-232 or RS-485 interface modules can be installed. These interface modules handle command instructions, setpoint adjustments, and real-time operational feedback. Proper module seating and cable bus termination prevent communication breakdown trips such as code CE0.
Diagnostics and Status Indication
The Lenze 345849 frequency inverter provides visual status feedback via a dual-color Red/Green LED mounted on the unit front panel. A solid green light signifies that the drive is powered and ready, while a flashing green light indicates active motor operation. A solid red light signals a TRIP fault condition, and a flashing red light indicates an active warning state.
Detailed fault evaluation is performed by reading TRIP error codes directly from the optional 8601.01 keypad display or by extracting the error history log recorded in parameter C0161 using Global Drive Control software. An internal status relay contact output is also available to trigger external annunciators or trip host safety circuits during fault conditions.
Status LED Indicators
| LED | Color/Status | Meaning |
|---|---|---|
| Red / Green LED | Red/Green - Solid / Flashing | Green lit: Drive operational/ready; Green flashing: Drive running; Red lit: TRIP fault state; Red flashing: Warning condition |
Replacement and Spare Part Considerations
Replacing a malfunctioning Lenze 345849 drive requires verifying electrical ratings and transferring software parameters. The donor or replacement unit must match the 4.0 kW power output, 9.5 A continuous current rating, and 320–528 V AC voltage range of model 8605_E.3D.44. Existing parameters must be uploaded from the original drive or restored from a saved GDC project file to preserve control parameters, motor protection settings, and fieldbus node parameters.
As the Lenze 8600 series is a legacy product line, maintaining a verified spare on hand prevents extended downtime in conveyor, pump, and packaging systems. For complete control system modernizations, Lenze offers the i550 cabinet frequency inverter series as a successor line. However, direct replacement with an original 345849 unit avoids control panel rewiring and PLC program modifications.
Error Codes & Fault Codes
The following error codes may be displayed during operation or diagnostics:
| Code | Name | Description | Possible Cause | Recommended Action |
|---|---|---|---|---|
| OC1 | Short Circuit | Short circuit or short to earth/ground detected at output terminals | Motor cable short circuit, motor winding short circuit, output power stage defect, ground fault in motor cable | Check motor cable for short circuits or ground faults, check motor insulation with megohmmeter. If trip occurs with motor disconnected, internal power stage fault is present requiring hardware repair or unit replacement. |
| OC2 | Overcurrent during Acceleration | Output current threshold exceeded during motor acceleration ramp | Acceleration time (ramp time) set too short, motor mechanically overloaded or blocked, motor cable excessively long | Increase acceleration time ramp, check motor sizing and mechanical load for jams, check cable lengths and motor parameters. |
| OC3 | Overcurrent during Deceleration | Output current threshold exceeded during motor braking ramp | Deceleration time set too short, fast ramp down without sufficient braking resistance | Increase deceleration time ramp, install external braking resistor or verify brake chopper wiring. |
| OC4 | Overcurrent at Constant Speed / Overload | Motor current exceeded maximum allowed limit during steady state operation | Sudden mechanical load surge, motor blocked or jammed, incorrect V/f curve setting | Inspect driven machinery for mechanical bind or blockage, review load profile and current limit settings. |
| OU | DC Bus Overvoltage | DC bus intermediate circuit voltage exceeded maximum limit (> 770 V DC) | Regenerative energy from driven load during braking, braking time too short, braking resistor open circuit or missing, input mains voltage too high | Check deceleration time ramps, verify internal brake chopper functionality and external braking resistor resistance/connection, check mains voltage. |
| LU | DC Bus Undervoltage | DC bus intermediate circuit voltage dropped below lower limit (< 400 V DC) | Mains supply voltage drop, phase loss in incoming AC power supply, transient power outage | Check mains voltage across all 3 input phases (L1, L2, L3), verify input fuses and main contactor connections. |
| OH | Heatsink Overtemperature | Drive power module heatsink temperature exceeded safe limit (> 85 °C) | Insufficient enclosure cooling/ventilation, ambient temperature above limit, cooling fan defective or blocked, heatsink dirty | Clean heatsink cooling fins, ensure adequate cabinet ventilation, verify operation of internal cooling fan, check ambient temperature. |
| OH4 | Motor Overtemperature | Motor thermal sensor (PTC or thermal contact) tripped due to overheating | Motor thermal overload, insufficient motor cooling at low speeds, motor fan failure, PTC sensor wire disconnected | Allow motor to cool down, inspect motor cooling fan, check PTC sensor wiring at control terminals T1 and T2. |
| EE | EEPROM Fault / Memory Error | Checksum fault or corruption detected in internal parameter storage | Power failure during parameter store write operation, internal EEPROM hardware failure | Reload factory default settings and restore parameters. If error persists after default load, internal control board hardware fault exists requiring repair or unit replacement. |
| CE0 | Communication Error | Communication breakdown between control unit and plugged option module / PC interface | Fieldbus cable disconnected, loose option module connection, improper bus termination, fieldbus master timeout | Check communication interface seating, inspect bus cabling and termination resistors, check bus master status. |
Frequently Asked Questions
How do I transfer parameters from an old Lenze 345849 drive to a replacement unit?
Parameters can be copied using the pluggable keypad module 8601.01 by uploading parameters from the original drive and downloading them to the replacement unit. Alternatively, parameters can be transferred using a PC running Lenze Global Drive Control (GDC) software connected via a LECOM RS-232/RS-485 interface module.
What causes an OC1 fault code on the Lenze 8605_E.3D.44 inverter?
An OC1 fault code indicates an output short circuit or ground fault in the motor cable or motor windings. If the fault persists when the motor cable is physically disconnected from output terminals, an internal power stage defect is present requiring hardware repair or unit replacement.
What input supply voltage and power rating does the Lenze 345849 require?
The Lenze 345849 frequency inverter operates on a 3-phase AC voltage range of 320 V AC to 528 V AC (nominal 3x 400/480 V AC), delivering a rated power of 4.0 kW with a continuous output current of 9.5 A.
Which fieldbus interfaces are compatible with the Lenze 345849?
The drive features a front option slot that supports optional communication modules including PROFIBUS-DP, CANopen, and Lenze LECOM RS-232 / RS-485 interface modules.
What steps should be taken if an OU overvoltage code appears?
An OU trip indicates that the DC bus voltage has exceeded 770 V DC, usually caused by regenerative energy during motor deceleration. Increase the deceleration time ramp, verify the internal brake chopper and external braking resistor connections, and check the incoming mains supply voltage.
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