Lenze 9321MP.2I.21 Control Board – 9300 Series Main Control PCB
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Product Information
The Lenze 9321MP.2I.21 is a main control PCB assembly engineered for Lenze 9300 series drive controllers operating in the 9321 frame size with a 0.37 kW power rating. Designed to serve as the central processing unit for both EVS9321 servo drives and EVF9321 vector frequency inverters, this control card executes advanced vector and servo control algorithms while operating across a supply voltage range of 320 V AC to 528 V AC. It coordinates core power stage switching at an 8 kHz switching frequency, delivering precise dynamic response and torque control in demanding motion control applications across packaging, material handling, textile manufacturing, and automated assembly lines.
Interfacing with external automation networks, the 9321MP.2I.21 provides an integrated CAN System Bus on terminal strip X4 supporting transmission speeds up to 500 kbps, along with a dedicated Automation Interface (AIF) slot. This interface slot accepts plug-in communication options such as the Keypad XT (EMF2102IB), PROFIBUS-DP module (EMF2131IB), INTERBUS modules (EMF2111IB/EMF2113IB), and LECOM RS-232 or RS-485 modules. For motor feedback, the board includes a 9-pin Sub-D connector for resolver feedback alongside incremental encoder master and slave connections. When commissioning a replacement board, technical personnel must restore system parameters from backup, as up to four complete parameter sets can be stored in the board's internal EEPROM using Lenze Global Drive Control (GDC) software or the Keypad XT module. When replacing a damaged PCB, ABC Industrial Parts can assist in sourcing fully compatible board assemblies to keep maintenance downtime to a minimum.
Diagnostics are displayed via onboard status LEDs and digital menu structures. A solid green DRIVE READY LED confirms operational readiness, while a blinking green LED signals controller inhibit or system initialization. The red TRIP LED illuminates upon an active fault condition, with historical diagnostic tracking accessible through a ring buffer storing up to 8 error codes in the Keypad XT P000 memory menu or via real-time signal tracing in GDC software. Common field faults such as motor overcurrent, bus communication interruptions, or overvoltage conditions can often be resolved by checking wiring, bus termination, or supply power. However, persistent hardware errors or unrecoverable EEPROM faults indicate internal failure that is not field-serviceable, requiring board replacement or tested exchange units from ABC Industrial Parts to restore production line operation.
Technical Specifications
| Manufacturer | Lenze |
| Part number | 9321MP.2I.21 |
| Component type | Main Control PCB Assembly |
| Compatible drive models | Lenze EVS9321 Servo / EVF9321 Vector |
| Compatible frame size | 9321 Frame Size |
| Rated power | 0.37 kW |
| Supply voltage range | 320 - 528 V AC |
| Switching frequency | 8 kHz |
| Control method | Vector Control / Servo Control |
| Integrated system bus | CAN (500 kbps) |
| Expansion interface slot | Automation Interface (AIF) |
| Parameter storage | Internal EEPROM (up to 4 parameter sets) |
| Feedback interfaces | Resolver (9-pin Sub-D), Incremental Encoder (Master/Slave) |
Programming and Configuration
Programming and parameter configuration for the Lenze 9321MP.2I.21 control board are performed using Lenze Global Drive Control (GDC) software or directly via the plug-in Keypad XT module (EMF2102IB) inserted into the Automation Interface slot. The control card features non-volatile internal EEPROM memory capable of holding up to four distinct parameter sets. This non-volatile storage ensures that motor parameters, application ramp settings, control limits, and fieldbus node parameters remain intact across power cycles.
During commissioning or replacement, parameter files can be downloaded from a PC or transferred between drives using the Keypad XT storage functions. If an invalid or uninitialized parameter set is activated, the control board generates a PR0 parameter fault. Operators can clear this condition by reloading a valid parameter file using GDC software. In replacement scenarios, performing a resolver angle alignment procedure after parameter transfer ensures proper commutation alignment and smooth torque generation.
Communication and System Integration
The 9321MP.2I.21 control board delivers system integration capabilities through both onboard bus connections and modular expansion options. High-speed drive-to-drive synchronization and multi-axis positioning are handled via the integrated CAN System Bus on terminal strip X4, operating at communication rates up to 500 kbps. This allows real-time speed, torque, and position reference sharing across multiple 9300 series drives without requiring external system controllers.
For higher-level PLC integration, the onboard Automation Interface (AIF) slot supports optional communication modules. These include the EMF2131IB PROFIBUS-DP interface, EMF2111IB and EMF2113IB INTERBUS modules, and LECOM serial interfaces (RS-232 and RS-485). Feedback acquisition is supported through a dedicated 9-pin Sub-D connector designed for resolver feedback, alongside master/slave incremental encoder interfaces for precise speed feedback and synchronized motion control.
Diagnostics and Status Indication
Status monitoring on the Lenze 9321MP.2I.21 control board is provided by two prominent status LEDs located on the card faceplate. The green DRIVE READY LED lights solid when the power stage and control routines are operational, and blinks when controller inhibit (CINH) is active or during system boot. The red TRIP LED illuminates solid during active fault conditions. If the red LED remains lit permanently upon power-up without external fault triggers, an internal hardware failure or memory corruption is present.
Advanced fault tracking is supported through an internal ring buffer that records the 8 most recent fault codes. Maintenance personnel can view this error log on the Keypad XT display under menu parameter P000, or perform live signal tracing and real-time oscilloscope analysis using Lenze Global Drive Control (GDC) software connected via the AIF port.
Status LED Indicators
| LED | Color/Status | Meaning |
|---|---|---|
| Red LED (TRIP) | Red - Solid | Active fault / trip state. Permanent illumination at power-up without external fault conditions indicates internal hardware or memory failure requiring factory service or board replacement. |
| Green LED (DRIVE READY) | Green - Solid / Blinking | Solid indicates drive ready for operation. Blinking indicates controller inhibit (CINH) or ongoing initialization. |
Replacement and Spare Part Considerations
When selecting a replacement control board for Lenze 9300 series drives, ensuring a complete part number match is essential. The 9321MP.2I.21 PCB is designed specifically for 9321 frame size inverters rated at 0.37 kW, including both EVF9321 vector inverters and EVS9321 servo drives. Verifying the exact hardware revision designation (.2I.21) ensures full pinout and power board interface compatibility.
Replacing a control card requires transferring parameter data from the original unit. If the original board remains accessible via GDC software or Keypad XT, parameters should be saved prior to removal and transferred to the new unit. Following parameter restoration on resolver-equipped servo systems, a resolver angle alignment must be executed to ensure proper motor alignment and dynamic response before restoring normal production operation.
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 1 | Short circuit or extreme overcurrent detected during acceleration phase. | Motor cable short circuit, earth fault, motor winding short, or acceleration ramp time too short. | Check motor wiring and isolation, verify acceleration time, check motor size. |
| OC2 | Overcurrent 2 | Overcurrent detected during deceleration phase. | Deceleration ramp time too short or motor regeneration too fast. | Increase deceleration time or install braking resistor. |
| OC5 | Overcurrent 5 | Overcurrent detected during steady-state operation. | Sudden mechanical load peak, motor jam, or power stage disturbance. | Inspect mechanical drive train and load conditions. |
| OU | Overvoltage DC Bus | DC bus voltage exceeded upper safety threshold. | Excessive regenerative energy returned from motor or supply voltage too high. | Check supply voltage, verify brake chopper operation and brake resistor connection. |
| LU | Undervoltage DC Bus | DC bus voltage dropped below minimum operating limit. | Mains supply phase loss, supply dip, or defective power supply stage. | Verify 3-phase AC input voltage and mains fuses. |
| OH | Heat Sink Overtemperature | Heat sink temperature exceeded maximum threshold (>90°C). | Cooling fan defective, inadequate ventilation, ambient temperature too high, or excessive load. | Clean heatsink, verify fan operation, and check ambient cooling. |
| OH4 | Motor Thermal Overload (I2t) | Calculated motor thermal load (I2t monitoring) exceeded threshold. | Continuous overload operation at low motor speeds. | Check motor sizing, duty cycle, or external motor cooling. |
| OH7 | Motor Temperature Sensor Circuit | Motor temperature sensor open circuit or wire break. | Disconnected thermistor/PTC cable or sensor failure. | Check temperature sensor wiring and connections on terminal strip. |
| CE0 | AIF Communication Error | Communication failure on Automation Interface module. | Fieldbus master timeout, loose module connection, or noise interference. | Check plug-in module seat, fieldbus cabling, and master configuration. |
| CE1 | System Bus (CAN) Communication Error | Communication interruption on internal/external CAN System Bus. | Bus cable broken, missing bus termination resistor, or incorrect baud rate. | Check CAN wiring, termination switches, and bus baud rate settings. |
| EE | EEPROM Memory Fault | Internal EEPROM checksum error or parameter read/write failure. | Internal memory corruption or hardware component failure. | Internal hardware fault — reload default parameters or return board/unit for repair. |
| H05 | Internal Hardware Fault | Internal controller/processor hardware error detected during diagnostic self-test. | Board level failure, micro-controller failure, or power supply rail malfunction. | Internal hardware fault — non-field-serviceable, replace control board assembly or unit. |
| PR0 | Parameter Set Fault | Selected parameter set is invalid or uninitialized. | Incomplete parameter set transfer or incompatible firmware version. | Re-download valid parameter file using GDC software. |
Frequently Asked Questions
Which Lenze drives are compatible with the 9321MP.2I.21 control board?
The board is designed specifically for 9321 frame size Lenze 9300 series drives rated at 0.37 kW, including EVS9321 servo drives and EVF9321 vector frequency inverters.
How are parameters transferred when replacing a 9321MP.2I.21 control board?
Parameter sets can be backed up and restored using Lenze Global Drive Control (GDC) software connected to the AIF slot or by using a plug-in Keypad XT module (EMF2102IB), which can store up to four complete parameter files in the board's internal EEPROM.
What does a solid red TRIP LED mean on the control board?
A solid red TRIP LED indicates an active drive fault. If the LED illuminates permanently upon power-up when no external fault conditions exist, it indicates an internal hardware failure or EEPROM fault requiring control board replacement.
What post-installation setup is required after replacing the control PCB on a servo drive?
In addition to restoring the parameter set using GDC software or Keypad XT, drives equipped with resolver feedback require a resolver angle alignment procedure to synchronize motor feedback with the control board.
What fieldbus communication options are supported by the 9321MP.2I.21?
The control card includes an onboard CAN System Bus on terminal X4 operating up to 500 kbps, and an Automation Interface (AIF) slot supporting PROFIBUS-DP (EMF2131IB), INTERBUS (EMF2111IB/EMF2113IB), and LECOM RS-232/RS-485 modules.
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