Lenze EVS9321-ES 9300 Series 0.75kW Servo Inverter
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Product Information
The Lenze EVS9321-ES is a 0.75 kW servo inverter from the Lenze 9300 Servo series, engineered for precise closed-loop speed and position control in automated industrial machinery. Operating from a nominal 3-phase supply of 400 V AC to 480 V AC across an input range of 320 V AC to 528 V AC, this drive delivers a continuous rated output current of 2.5 A into motor phases ranging from 0 V AC to 480 V AC. It is housed in an IP20 protection enclosure designed for space-saving vertical control cabinet mounting and features a peak output capacity of 3.75 A (150% overload) to handle demanding dynamic acceleration profiles in packaging, material handling, textile, and assembly applications.
Connecting and commissioning a replacement EVS9321-ES requires precise configuration alignment with the existing machine system. The drive supports feedback evaluation for standard resolvers and incremental encoders, while system integration is facilitated through 6 digital inputs, 4 digital outputs, 2 analog inputs, 2 analog outputs, and an integrated CAN system bus. It also features a pluggable Automation Interface (AIF) slot that accommodates optional communication modules such as the PROFIBUS-DP module (EMF2133IB). A spare drive cannot be put directly into service without transferring the system configuration; application parameters stored in non-volatile EEPROM memory must be loaded using Lenze Global Drive Control (GDC) software via a USB-CAN adapter (EMF2177IB) or transferred using the pluggable XT Keypad (EMF2102IB). ABC Industrial Parts can assist maintenance teams with sourcing verified spare units and transferring parameter sets during field swaps.
Diagnostic monitoring on the EVS9321-ES is provided through status LEDs, the XT Keypad, and GDC software diagnostic windows. Onboard LEDs indicate drive operational states, including a Green Ready status, Red Trip/Fault alert, and Yellow IMP pulse inhibit indicator, while an internal fault buffer records the last four TRIP messages alongside status codes C0183 and C0168. Line supply issues like phase loss (P12), DC bus overvoltage (OU), or resolver wiring faults at terminal X7 (rER) can be diagnosed by checking mains input voltage, braking choppers, and feedback cables. However, critical hardware issues like code H05 or persistent EEPROM read/write errors (EER) point to unserviceable internal board failures; in these instances, replacing the unit with a tested spare from ABC Industrial Parts is the fastest route back to production.
Technical Specifications
| Manufacturer | Lenze |
| Part Number | EVS9321-ES |
| Model / Type | EVS9321-ES |
| Component Type | Servo Inverter |
| Product Family | 9300 Servo |
| Rated Power | 0.75 kW |
| Supply Voltage Range | 320 - 528 V AC |
| Nominal Input Voltage | 400 / 480 V AC |
| Rated Output Current | 2.5 A |
| Peak Output Current | 3.75 A |
| Output Voltage Range | 0 - 480 V AC |
| Maximum Output Frequency | 480 Hz |
| Switching Frequency | 8 kHz |
| Power Loss | 60 W |
| Protection Rating | IP20 |
| Digital Inputs | 6 |
| Digital Outputs | 4 |
| Analog Inputs | 2 |
| Analog Outputs | 2 |
Programming and Configuration
Drive setup and parameter adjustment for the Lenze EVS9321-ES are performed using Lenze Global Drive Control (GDC) software or the pluggable XT Keypad (EMF2102IB). The internal non-volatile EEPROM memory stores up to four complete parameter sets, enabling multi-recipe management and quick parameter restoration following maintenance operations.
To transfer parameters using a PC, the system connects via a USB-CAN Adapter (EMF2177IB) running GDC software. If a complete configuration reset is necessary before re-commissioning a unit on a new machine, setting parameter C0002 to 1 executes a factory default reset, allowing technicians to apply a fresh project file without residual parameter conflicts.
Communication and System Integration
The EVS9321-ES features an onboard CAN system bus designed for high-speed inter-drive communication, multi-axis motion synchronization, electronic shaft configurations, and cascade positioning systems. Reliable operation across the CAN network requires correct line impedance with 120-Ohm termination resistors installed at physical end nodes, proper cable shielding, and matching baud rate settings across all connected drives.
For integration into broader industrial automation networks, the drive includes a pluggable Automation Interface (AIF) slot. This interface supports optional fieldbus modules including PROFIBUS-DP (EMF2133IB), DeviceNet, Interbus, and serial LECOM options. Additional control connections are routed through hardwired terminal strips providing 6 digital inputs, 4 digital outputs, 2 analog inputs, and 2 analog outputs.
Diagnostics and Status Indication
Visual status indication on the EVS9321-ES is provided by three diagnostic LEDs located on the front panel: Green (Ready), Red (Trip/Fault), and Yellow (IMP/Pulse Inhibit). These LEDs instantly indicate whether the drive is operational, disabled, or locked in a trip condition.
Comprehensive diagnostic routines are accessible through the XT Keypad status monitor (register C0168) or the GDC software diagnostic window. The drive maintains an internal fault buffer log (register C0183) that records the last four TRIP messages complete with diagnostic codes and timestamps, enabling technicians to analyze root causes for intermitted stoppages.
Status LED Indicators
| LED | Color/Status | Meaning |
|---|---|---|
| Ready | Green - Blinking / Solid | Blinking green: Controller initialized, power stage inhibited; Solid green: Controller operational / drive ready |
| Trip / Fault | Red - Blinking / Solid | Blinking red: Warning / active message; Solid red: Fault active / Trip state (power stage disabled) |
| IMP / Pulse Inhibit | Yellow - Solid | Solid yellow: Power stage pulses are inhibited (controller disable active) |
Replacement and Spare Part Considerations
When replacing an EVS9321-ES servo inverter, confirm that the replacement unit shares the exact part number and electrical ratings (0.75 kW power rating, 2.5 A continuous current, 320–528 V AC input). Any fieldbus communication card installed in the original drive's AIF slot—such as a PROFIBUS-DP module—must be physically transferred to the replacement unit and seated securely before power-up.
A replacement drive will not operate correctly out of the box without transferring the original application parameters. Parameters stored in the non-volatile EEPROM must be transferred using the XT Keypad (EMF2102IB) or uploaded/downloaded via Lenze Global Drive Control (GDC) software using the USB-CAN Adapter (EMF2177IB). Verify all wiring terminals prior to commissioning, paying close attention to resolver feedback connections at terminal X7 and PTC thermal motor protection at terminal X10.
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 on motor output terminals or excessive overcurrent peak | Short circuit in motor cable, motor winding fault, ground fault, or rapid acceleration with improper motor data | Check motor and output motor cable wiring for insulation fault or short circuit; check acceleration ramps; if fault triggers immediately with motor disconnected, power stage circuit board is damaged (return for service) |
| OC2 | Earth Fault | Ground fault on motor phase output | Ground connection / leakage current to PE in motor winding or motor cable | Check insulation resistance of motor and motor wiring; inspect cable shields and cable glands |
| OC5 | I x t Overload | Continuous motor / drive overload limit reached (150% exceeded for duration) | Mechanical blockage, excessive continuous load, drive undersized for dynamic profile | Check mechanical drive train for stiffness or jams; reduce duty cycle or acceleration dynamic |
| OU | Overvoltage DC Bus | DC bus voltage exceeded maximum allowable threshold | Braking energy regenerated into DC bus without braking chopper / resistor or excessive deceleration slope | Extend deceleration time; install or check external braking resistor and brake chopper |
| LU | Undervoltage DC Bus | DC bus voltage dropped below minimum threshold | Mains supply failure, voltage dip, blown line fuse, line phase loss | Verify line input voltage across phases; check fuses and supply contactor |
| OH | Heatsink Overtemperature | Heatsink temperature exceeded upper limit (>85°C) | Insufficient ventilation inside enclosure, clogged fan/heatsink fins, ambient temperature too high | Clean heatsink, check internal cooling fan operation and cabinet ventilation airflow |
| OH3 | Motor Overtemperature (PTC) | Motor temperature sensor trip via terminal X10 | Motor thermal overload, PTC sensor cable broken or disconnected, cooling fan on motor failed | Allow motor to cool down, check motor load and forced ventilation fan; inspect PTC wiring at X10 |
| OH4 | Drive Interior Overtemperature | Temperature inside the servo drive housing exceeded safety threshold | Control cabinet internal ambient temperature excessive | Check control cabinet air conditioning or cooling fan unit |
| NMAX | Maximum Speed Exceeded | Motor actual speed exceeded max speed parameter limit (C0025) | Incorrect speed controller tuning, field weakening error, overshoot during fast load drop | Check speed controller parameters; verify encoder resolution and scaling settings |
| CE0 | AIF Communication Error | Communication failure between control board and inserted AIF fieldbus module | AIF module missing, loose connection, PLC network timeout, incorrect baud rate | Check seating of module in AIF slot; check network wiring and master PLC status |
| CE1 | CAN System Bus Communication Fault | CANbus message timeout or bus-off error | Interrupted CAN line, missing bus termination resistors (120 Ohm), baud rate mismatch | Inspect CAN shield grounding, line continuity, and termination resistors at physical end nodes |
| EER | EEPROM Fault | Internal EEPROM memory read/write error during power-up or parameter save | Corrupted non-volatile parameter memory or internal micro-controller circuit damage | Attempt factory default reset (C0002 = 1); if fault persists after power cycle, internal board failure present — return unit for repair |
| H05 | Internal Hardware Error | Drive controller board internal hardware monitoring trigger | Internal power supply rail voltage out of tolerance or processor self-test failure | Internal hardware fault — non-field serviceable. Disconnect power and send drive for repair/replacement |
| P12 | Mains Phase Fault | Loss of one phase of 3-phase AC input supply | Blown supply fuse, loose power terminal connection, unstable utility feed | Check line supply voltages under load at input terminals L1, L2, L3 |
| rER | Resolver Fault | Resolver signal track fault or signal interruption at X7 | Disconnected resolver cable, damaged shield, faulty resolver winding in motor | Inspect cable connector at X7; verify resolver signal levels and cable integrity |
| SFL | System Software Fault | Watchdog / task error in drive control software program execution | Firmware crash or severe electrical noise coupling into CPU | Check grounding / shielding measures; power cycle drive; if persistent, reflash firmware or return unit for service |
Frequently Asked Questions
What tools are needed to transfer parameters to a replacement Lenze EVS9321-ES?
Parameter sets can be transferred using the pluggable XT Keypad (EMF2102IB) or uploaded and downloaded with Lenze Global Drive Control (GDC) software connected through a USB-CAN Adapter (EMF2177IB).
Can I install an EVS9321-ES drive without reconfiguring parameters?
No. A replacement unit must be loaded with the machine-specific parameter set from the original drive's EEPROM memory or GDC backup file before the drive can operate properly.
What does fault code H05 indicate on the EVS9321-ES?
Fault code H05 signifies an internal hardware monitoring fault, such as an internal power supply voltage failure or processor test error. This issue cannot be serviced in the field and requires drive repair or replacement.
How do I resolve a resolver fault indicated by code rER?
Inspect the resolver cable and connector seated at terminal X7, verify shielding against electrical noise, and check the motor's internal resolver winding for damage or signal degradation.
Which fieldbus modules are compatible with the AIF slot on the EVS9321-ES?
The pluggable AIF slot supports optional modules including PROFIBUS-DP (EMF2133IB), DeviceNet, Interbus, and serial LECOM communication modules.
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