Danfoss 195N0031 VLT2807PS2B20STR1DBF10A00C0 – VLT 2800 Frequency Inverter
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Product Information
The Danfoss 195N0031, model code VLT2807PS2B20STR1DBF10A00C0, is a compact 0.75 kW (1.0 HP) frequency inverter within the Danfoss VLT 2800 series. Operating from a single-phase 200-240 V AC supply at 50/60 Hz, this variable frequency drive delivers a continuous output current of 4.0 A and an intermittent peak current of 6.4 A, supporting output frequencies from 0 to 1000 Hz. Built in an IP20 panel-mount enclosure, the inverter utilizes Voltage Vector Control (VVC+) technology alongside standard V/f control to deliver full motor torque at low speeds without requiring external encoder feedback. Factory-equipped options include an integrated dynamic brake chopper for regenerative load control and a built-in Class A1/1B RFI filter to reduce electromagnetic noise in industrial environments.
Field connections feature five digital inputs, two analog inputs configurable for 0-10V DC or 0/4-20mA, one high-speed pulse input up to 67 kHz, one analog output, and one SPDT relay output. Network communication is provided through an onboard Profibus DP interface supporting transmission speeds up to 12 Mbit/s, in addition to standard RS-485 serial connection supporting Modbus RTU. Commissioning a replacement spare drive involves transferring internal drive parameters held in the non-volatile EEPROM storage, which accommodates up to four independent parameter setups. Configuration can be executed via an optional Danfoss LCP operator panel or through Danfoss MCT 10 software. Matching drive settings, fieldbus node addresses, and terminal control configurations ensures proper operation. Support from ABC Industrial Parts can assist maintenance teams with parameter extractions and replacement drive preparation.
Drive operational status and internal monitoring are visible via a 4-digit 7-segment display and front panel LEDs, including yellow WARNING, red ALARM, and green BUS indicators. Real-time diagnostic readouts provide visibility into output current, motor voltage, frequency, DC link bus voltage, and inverter heatsink temperature. In the event of a trip, the drive logs specific alarm numbers into an internal fault buffer, covering conditions such as live zero signal drop, mains phase loss, overvoltage, motor overload, earth faults, and fieldbus timeouts. First-line troubleshooting involves checking input phase supply, motor cable insulation, analog signal loop integrity, and Profibus cabling termination. When internal hardware errors like Switch Mode Fault or Inrush Fault occur, board-level repairs or an exchange replacement from ABC Industrial Parts provide an effective solution to restore production uptime.
Technical Specifications
| Manufacturer | Danfoss |
| Part Number | 195N0031 |
| Model / Type | VLT2807PS2B20STR1DBF10A00C0 |
| Product Family | VLT 2800 |
| Component Type | Frequency Inverter |
| Rated Power (kW) | 0.75 kW |
| Rated Power (HP) | 1.0 HP |
| Supply Voltage Range | 200-240 V AC |
| Supply Frequency | 50/60 Hz |
| Continuous Output Current | 4.0 A |
| Maximum Output Current (Intermittent) | 6.4 A |
| Control Principle | VVC+ (Voltage Vector Control), V/f |
| Output Frequency Range | 0-1000 Hz |
| Dynamic Brake Chopper | Built-in |
| RFI Filter | Built-in Class A1/1B |
| Digital Inputs | 5 |
| Analog Inputs | 2 (0-10V DC, 0/4-20mA) |
| Pulse Inputs | 1 (Up to 67 kHz) |
| Analog Outputs | 1 |
| Relay Outputs | 1 SPDT |
| Protection Rating | IP20 |
| Fieldbus Interface | Profibus DP (Up to 12 Mbit/s) |
| Serial Interface | RS-485 (Modbus RTU) |
Programming and Configuration
Drive configuration for the Danfoss 195N0031 is performed either locally using a plug-in Danfoss LCP Control Panel or remotely via Danfoss MCT 10 PC setup software. Parameters are logically grouped, covering motor setup, ramp times, reference scaling, digital/analog I/O assignment, and communication protocols. An Automatic Motor Adaptation (AMT) function allows the inverter to measure motor stator parameters automatically without rotating the load, optimizing VVC+ control precision.
The internal non-volatile EEPROM memory supports four independent parameter setups, enabling multi-mode machinery operation or quick configuration switching. Setup files created in MCT 10 can be saved to a PC and uploaded directly to replacement drives via serial RS-485 or Profibus links, streamlining spare unit commissioning and ensuring parameter consistency across production lines.
Communication and System Integration
The VLT2807PS2B20STR1DBF10A00C0 includes an integrated high-performance Profibus DP option card capable of communication rates up to 12 Mbit/s. This fieldbus interface allows real-time control, reference speed command transmission, operational status monitoring, and diagnostic retrieval directly from a central Programmable Logic Controller (PLC).
In addition to Profibus DP, an RS-485 serial port is available on the control terminals for standard bus or Modbus RTU communication. Network parameters such as station address, baud rate, and bus monitoring timeout limits are configured in parameter group 500, enabling reliable system integration into building automation, material handling, or packaging control architectures.
Diagnostics and Status Indication
The drive features a 4-digit 7-segment LED display alongside dedicated status LEDs to indicate operating states and active fault conditions. Diagnostic readouts allow technicians to evaluate motor current, output frequency, motor voltage, DC bus voltage, and inverter temperature directly at the drive module.
Detailed fault diagnostics are logged into an internal fault buffer, storing historical trip codes for post-event analysis. Live parameters and fault histories can also be analyzed using Danfoss MCT 10 software over the serial or Profibus communication links.
Status LED Indicators
| LED | Color/Status | Meaning |
|---|---|---|
| WARNING | Yellow - Solid | Active warning condition detected |
| ALARM | Red - Solid / Flashing | Drive trips due to a fault condition |
| BUS | Green - Solid / Active | Active bus communication state |
Replacement and Spare Part Considerations
When replacing a Danfoss 195N0031 drive, verify that the complete model code VLT2807PS2B20STR1DBF10A00C0 matches. This ensures that essential hardware features, including the 0.75 kW power stage, integrated dynamic brake chopper, RFI filter, and internal Profibus DP option card, are present on the spare drive.
Because the Danfoss VLT 2800 series is discontinued by the manufacturer, sourcing an exact replacement unit is essential for maintaining control cabinet layouts and network wiring without requiring panel modifications. For new machinery designs or comprehensive plant modernizations, Danfoss recommends migrating to the VLT Midi Drive FC 280 series.
Error Codes & Fault Codes
The following error codes may be displayed during operation or diagnostics:
| Code | Name | Description | Possible Cause | Recommended Action |
|---|---|---|---|---|
| 2 | LIVE ZERO ERROR | Signal on terminal 50 or 60 dropped below 50% of the set min value | Broken signal wire, disconnected sensor, or incorrect reference scaling | Check wiring to terminals 50/60 and verify analog signal source |
| 4 | MAINS PHASE LOSS | Phase missing on mains supply side or severe voltage unbalance | Missing line phase, blown fuse, or unbalanced mains supply | Check supply line voltage and incoming phase fuses |
| 5 | VOLTAGE WARNING HIGH | Intermediate circuit DC voltage exceeds warning threshold | High line voltage or motor regenerating during deceleration | Extend deceleration time or check line supply voltage |
| 6 | VOLTAGE WARNING LOW | Intermediate circuit DC voltage dropped below lower warning limit | Mains supply voltage voltage drop or momentary power interruption | Verify line input voltage is within spec (+/-10%) |
| 7 | OVERVOLTAGE | Intermediate circuit DC link voltage exceeds trip limit | Excessive motor regenerative energy, fast deceleration without sufficient braking, or overvoltage surge | Increase ramp-down time, verify brake chopper and resistor connection |
| 8 | UNDERVOLTAGE | DC link voltage fell below minimum tripping threshold | Mains blackout, brownout, or severe line supply collapse | Check input supply voltage and mains stability |
| 9 | INVERTER OVERLOAD | Inverter thermal load monitor (ETR) has exceeded 100% | Drive operated above 100% continuous rated current for too long | Reduce load or check for mechanical binding; check drive sizing |
| 10 | MOTOR OVERLOAD | Electronic thermal motor protection (ETR) calculated motor overtemperature | Motor run under continuous heavy load at low speed without external cooling | Reduce motor load, increase speed, or install external motor cooling fan |
| 11 | MOTOR THERMISTOR | Motor thermistor connected to input terminal triggered trip | Motor overheating due to overload or inadequate cooling | Allow motor to cool down, inspect ventilation, check thermistor wiring |
| 12 | CURRENT LIMIT | Output current reached user-programmed current limit | Mechanical overload, rapid acceleration, or wrong motor data parameters | Inspect driven machinery, verify ramp-up time and motor parameters |
| 13 | OVERCURRENT | Inverter peak output current limit exceeded | Short circuit on motor cables, ground fault, rapid load spike, or wrong motor parameter settings | Check motor and motor cable insulation, disconnect motor and test drive independently |
| 14 | EARTH FAULT | Ground leakage current detected on output phases | Phase-to-ground fault in motor windings or output motor cable | Measure insulation resistance of motor cable and motor windings with a megohmmeter |
| 15 | SWITCH MODE FAULT | Internal switch mode power supply failure detected | Internal hardware failure on control card or power supply circuit board | Internal hardware fault — return unit for service or replace drive |
| 16 | SHORT CIRCUIT | Short circuit detected between motor output phases U-V, V-W, or U-W | Direct short circuit in motor terminals, winding insulation failure, or cable failure | Check motor terminal box and cable insulation for short circuits |
| 17 | STD BUS TIMEOUT | Communication lost on RS-485 standard bus link | Broken communication cable, incorrect baud rate, noise interference, or host controller stopped communicating | Check serial communication wiring, termination resistors, and master controller status |
| 18 | HPFB TIMEOUT | Fieldbus communication timeout on Profibus option | Profibus master stopped communicating, network break, or wrong node address | Inspect Profibus cabling, bus connector, termination, and PLC master module |
| 33 | OUT OF FREQ RANGE | Output frequency exceeded set minimum/maximum limits | Parameter setup mismatch or motor speed feedback issue | Verify frequency limit parameters in parameter group 200 |
| 34 | HPFB COMM FAULT | Internal communication failure between drive main control board and fieldbus module | Fieldbus card unseated, loose internal ribbon cable, or damaged option board | Re-seat Profibus module option card; if fault persists, replace unit or option board |
| 35 | INRUSH FAULT | Inrush pre-charge circuit relay did not close properly | Internal pre-charge resistor or bypass contactor/relay fault | Internal board component failure — replace unit or submit for service repair |
| 36 | OVERTEMPERATURE | Heat sink temperature exceeded upper safety limit | Blocked cooling heatsink, fan failure, ambient temperature too high, or extreme overload | Clean heat sink fins, check cooling fan operation, ensure adequate panel ventilation |
| 37-45 | INTERNAL FAULT | Internal micro-processor, memory, or logic hardware error | Hardware component failure, corrupted internal firmware, or board defect | Internal hardware fault — disconnect power, restart drive; if persistent, replace unit |
| 50 | AMT CALIBRATION FAULT | Automatic Motor Adaptation process failed during execution | Motor size mismatch, improper motor data entered, or motor disconnected during test | Check motor nameplate parameters entered in parameters 102-106 and re-run AMT |
| 51 | AMT WRONG MOTOR | Motor current/power data entered is incompatible with drive rating for AMT | Motor power rating too small or too large relative to drive capacity | Verify motor specifications match drive current rating limits |
Frequently Asked Questions
How do I transfer parameters when replacing a Danfoss 195N0031 drive?
Parameters stored in non-volatile EEPROM can be backed up and uploaded to a replacement drive using Danfoss MCT 10 setup software via RS-485 or Profibus connections, or manually configured using a Danfoss LCP operator panel. Ensure all active parameter setups (up to four) are copied.
What communication ports are built into model VLT2807PS2B20STR1DBF10A00C0?
This model features an integrated Profibus DP option supporting rates up to 12 Mbit/s alongside an RS-485 serial port supporting Modbus RTU or standard bus protocols.
How does Automatic Motor Adaptation (AMT) work on this inverter?
Automatic Motor Adaptation measures motor stator resistance at standstill to optimize VVC+ vector control settings. After entering motor nameplate values in parameters 102 to 106, running AMT automatically calculates performance values without rotating the motor.
What steps should be taken if Fault 15 (Switch Mode Fault) or Fault 35 (Inrush Fault) occurs?
Fault 15 indicates an internal switch-mode power supply failure, and Fault 35 indicates a pre-charge relay failure. Both represent internal hardware defects that cannot be serviced in the field, requiring board repair or drive replacement.
Is the Danfoss 195N0031 discontinued, and what is the recommended successor line?
Yes, the VLT 2800 series is discontinued. Exact part number 195N0031 replacements are maintained to support existing control systems, while the Danfoss VLT Midi Drive FC 280 series is recommended for new system designs.
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