Lenze 7814.1 329170 Range 7800 Frequency Inverter
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Product Information
The Lenze 7814.1, model 329170, is a 3.0 kW frequency inverter from the Lenze Range 7800 family designed for variable speed regulation of standard 3-phase AC induction motors. Operating on a nominal 400V AC 3-phase supply across a voltage tolerance of 320V to 506V AC, this compact drive provides a continuous rated output current of 7.0 A with an adjustable output frequency range from 0 to 480 Hz. Housed in an IP20 enclosure with accessible screw terminal connections, the unit utilizes V/f characteristic control with linear or quadratic performance curves to manage constant torque applications such as conveyors and agitators, or variable torque loads in centrifugal pumps and ventilation fans.
Connecting external setpoints and machine control signals is managed via screw terminals accommodating 0 to 10 V or 0/4 to 20 mA analog speed inputs, alongside programmable digital inputs for start, stop, rotation direction, and preset operating speeds. Operational signaling is handled through a dedicated volt-free relay contact. Putting a spare drive into service is rarely a direct plug-and-run operation because operating parameters must be loaded into the unit's non-volatile internal EEPROM memory to match machine requirements. Parameter transfer and commissioning are performed using the Lenze Operating Module 2102 keypad or Lenze Global Drive Control (GDC) software connected via a LECOM interface module. Support from ABC Industrial Parts can help facilitate parameter extraction and configuration setup when replacing a damaged drive.
Real-time monitoring and diagnostic feedback are provided by front-panel status LEDs that display system readiness, active TRIP fault states, and current limit threshold conditions. The drive records trip events in an internal fault history buffer accessible through the 2102 keypad display or LECOM status registers, identifying standard faults such as overcurrent (OC1), motor thermal overload (OC5), DC bus overvoltage (OU), undervoltage (LU), and heatsink overtemperature (OH). Initial troubleshooting should focus on verifying three-phase input line voltages, motor winding insulation, cooling airflow, and option board seating. Persistent internal hardware faults, such as EEPROM checksum errors (EE code), cannot be serviced in the field, making drive repair or a fully tested replacement from ABC Industrial Parts the quickest route back to production.
Technical Specifications
| Manufacturer | Lenze |
| Part Number | 7814.1 |
| Model / Type | 329170 |
| Product Family | Range 7800 |
| Component Type | Frequency Inverter |
| Rated Power | 3.0 kW |
| Supply Voltage | 400 V AC |
| Supply Voltage Range | 320 - 506 V AC |
| Output Current | 7.0 A |
| Output Voltage Range | 0 - 400 V AC |
| Output Frequency Range | 0 - 480 Hz |
| Control Method | V/f Characteristic Control |
| Protection Rating | IP20 |
Programming and Configuration
Parameterization of the Lenze 7814.1 frequency inverter is structured around an internal non-volatile EEPROM memory that retains all drive settings across power cycles. Drive behavior, including V/f curve characteristics, acceleration and deceleration ramp times, minimum and maximum output frequencies, and current limits, can be adjusted to match the application requirements.
Engineering tools for setup and backup include the plug-in Lenze Operating Module 2102 keypad and the PC-based Lenze Global Drive Control (GDC) software suite. Using the keypad module, technicians can navigate the parameter menu, read active operational status, and examine saved trip history. For automated configuration management, GDC software enables parameter set extraction, offline project storage, and direct download over a serial communication link.
When installing a replacement inverter, ensuring parameter alignment between the failed unit and the spare is critical. Re-initializing parameter sets to factory defaults provides a known baseline before manually re-entering parameters via the 2102 keypad or transferring a verified parameter file through Global Drive Control.
Communication and System Integration
System integration for the Lenze 7814.1 is implemented using plug-in options attached to the drive's communication interface slot. Standard control connection is provided through IP20 screw terminals accepting 0 to 10 V voltage setpoints or 0/4 to 20 mA current setpoints, alongside programmable digital control inputs and a volt-free relay output for status signaling.
For serial bus connectivity, the inverter supports LECOM modules such as the Lenze LECOM 2102 IB interface adapter. This module enables RS-232 or RS-485 serial communication with higher-level controllers, human-machine interfaces, or remote commissioning PCs, allowing continuous readout of status registers and direct control over inverter operation.
Successful fieldbus integration requires setting matching communication parameters on the option module, including the designated station address and baud rate. Loose option module seating or incorrect network wiring triggers communication alarm CE0, inhibiting network control until connections and bus settings are restored.
Diagnostics and Status Indication
The front panel of the Lenze 7814.1 features three LED status indicators that provide immediate visual feedback on drive operation and fault conditions. The green LED indicates active mains supply and operational readiness, the red LED highlights a TRIP fault state with output inhibition, and the yellow/red LED illuminates when the drive reaches its active current limiting threshold.
Detailed diagnostic evaluation is available through the optional 2102 operating module display and LECOM status register readouts. The internal trip history buffer records fault codes generated by protection routines, enabling technicians to identify whether an shutdown was caused by output overcurrent, overvoltage, under-voltage, or thermal overload conditions.
Status LED Indicators
| LED | Color/Status | Meaning |
|---|---|---|
| Ready / Betrieb | Green - Solid | Illuminated when mains supply is active and inverter controller is ready for operation. |
| Trip / Störung | Red - Solid | Illuminated when drive is in a TRIP fault condition. Inverter output is inhibited. |
| Imax / Strombegrenzung | Yellow/Red - Solid | Illuminated when current limit threshold has been reached and current limiter is actively controlling output. |
Replacement and Spare Part Considerations
Replacing a Lenze 7814.1 (type 329170) with an identical Range 7800 drive preserves existing cabinet mounting and wiring layouts. Because physical terminal arrangements and voltage ratings match directly, mechanical panel modifications or main circuit re-engineering are unnecessary.
Before applying power to a replacement unit, confirm that the supply voltage matches the specified 320V to 506V AC 3-phase window and that motor cabling matches output terminal layout. A replacement inverter must be configured with the application-specific parameter set extracted from the original unit or reloaded from a saved GDC software backup project.
If the existing drive shows non-recoverable internal errors such as EEPROM checksum failures (EE) or control board damage, parameters must be transferred manually using the 2102 operating module or re-entered manually from system documentation prior to placing the machinery back into automated service.
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 / Overcurrent | Short circuit on output motor terminals, line earth fault, or extreme sudden overload. | Short circuit in motor cable or motor winding; excessive acceleration rate; motor size too large for drive. | Check motor and motor cable insulation; increase acceleration time; check drive sizing. |
| OC5 | I x t Motor Overload | Continuous current overload exceeded over calculated thermal limit period. | Mechanical overload on driven machine; motor operated continuously at low speed under heavy load. | Check mechanical load for jam or binding; reduce motor load; adjust Ixt thermal settings. |
| OU | DC Bus Overvoltage | Intermediate circuit DC bus voltage exceeded upper protection threshold. | Excessive regenerative energy during deceleration; deceleration time too short; brake chopper non-functional. | Increase deceleration ramp time (decel time); connect or inspect braking resistor and brake module. |
| LU | DC Bus Undervoltage | DC bus voltage dropped below minimum operating limit. | Mains supply voltage drop; line phase loss; power supply interruption. | Check supply mains line voltage; verify all three input phases are present under load. |
| OH | Heatsink Overtemperature | Internal heatsink temperature exceeded upper safety limit. | Insufficient cooling airflow; high ambient temperature; cooling fans stopped or blocked; heavy overload. | Clean heatsink cooling fins; verify enclosure ventilation and cooling fan operation; reduce ambient temperature. |
| OH4 | Motor Overtemperature | Motor temperature sensor / PTC thermistor input triggered. | Motor overheating; PTC sensor cable open circuit. | Allow motor to cool down; check motor thermal protection circuit and wiring. |
| EE | EEPROM Memory Error | Checksum fault or corruption detected in non-volatile parameter memory. | Hardware component failure on main control board; loss of power during parameter saving. | Re-initialize parameters to factory defaults and reprogram. Internal hardware fault — if error persists, return unit for repair or replace drive. |
| CE0 | Communication Error | Communication failure between inverter and LECOM module or external controller. | Loose connection on option slot; bad communication cable; incorrect baud rate or station address. | Check LECOM interface seating, cable connections, shielding, and communication parameters. |
Frequently Asked Questions
What is the continuous power and output current rating of the Lenze 7814.1?
The Lenze 7814.1 (model 329170) delivers a continuous rated power output of 3.0 kW with an output current of 7.0 A when operating from a nominal 400V AC 3-phase supply.
How are parameters transferred when replacing a Lenze 7814.1 inverter?
Parameters stored in the internal non-volatile EEPROM can be read and transferred using the plug-in Lenze Operating Module 2102 keypad or saved and downloaded via PC using Lenze Global Drive Control (GDC) software with a LECOM interface adapter.
What communication interfaces work with the Lenze 7814.1 drive?
The drive supports serial communication using optional plug-in LECOM interface modules, such as the LECOM 2102 IB RS-232 / RS-485 adapter, connecting to remote control systems or commissioning software.
What do the front panel LED indicators on the Lenze 7814.1 mean?
The solid green LED indicates active mains power and ready status, the solid red LED signifies a TRIP fault condition with inhibited output, and the solid yellow/red LED shows active current limiting (Imax).
What actions should be taken if fault code EE appears on the drive?
Fault code EE signals an EEPROM parameter checksum error. Re-initialize parameters to factory default settings and reload configuration data. If the error persists after power cycling and re-programming, an internal control board failure has occurred requiring drive repair or replacement.
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