Danfoss 175Z0031 VLT5001PT5B20STR3D0F00A00C0 VLT 5000 Drive
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Product Information
The Danfoss 175Z0031 is a 3-phase variable frequency drive from the VLT 5000 product family, designated by model code VLT5001PT5B20STR3D0F00A00C0. Designed to control asynchronous AC motors on 380–500 V AC line supplies at 50/60 Hz, this unit provides dual power ratings: 0.75 kW (1.0 HP) with 160% high overload capability for constant torque demands, and 1.1 kW (1.5 HP) with 110% normal overload capability for variable torque applications such as pumps and fans. Motor control is driven by the Danfoss VVCplus sensorless flux vector algorithm, providing motor dynamic response across an output frequency range of 0 to 1000 Hz. The drive is built in a compact IP20 Bookstyle B20 frame designed for side-by-side cabinet mounting without thermal power derating, and includes an integrated Class A1 RFI noise suppression filter.
Field connection and control interface capabilities include 8 programmable digital inputs, 2 multi-function analog inputs, 1 analog current output, 2 configurable relay outputs, and an RS-485 serial interface on terminals 68 and 69 supporting Modbus RTU and Danfoss FC protocols. Commissioning a spare drive requires transferring parameter files to match motor nameplate data, digital I/O assignments, and network node settings. Parameter backup and transfer can be executed using the pluggable Danfoss LCP 2 Local Control Panel (175Z0401) or via a PC running Danfoss MCT 10 setup software. Technicians can rely on ABC Industrial Parts for pre-tested replacement drives and technical assistance with parameter transfer or configuration alignment.
Operational status is indicated via three front panel LEDs: a green ON LED for control logic power, a yellow WARNING LED for operating limit conditions, and a red ALARM LED for fault trips. Fault codes and trip history are recorded in Parameters 600 through 605 and can be reviewed on the LCP 2 display readout or through live tracing in MCT 10 software. Initial diagnostic checks should verify line voltage across terminals L1, L2, and L3, output cable insulation on motor terminals U, V, and W, and serial connection integrity on terminals 68 and 69. When internal power card or switch mode power supply errors occur (such as Alarm 15 or Alarm 36), the unit cannot be repaired in the field, making a pre-tested exchange unit or repair service through ABC Industrial Parts the standard path to resume production.
Technical Specifications
| Manufacturer | Danfoss |
| Part Number | 175Z0031 |
| Model / Type | VLT5001PT5B20STR3D0F00A00C0 |
| Product Family | VLT 5000 |
| Component Type | Variable Frequency Drive |
| Supply Voltage Range | 380 - 500 V AC |
| Supply Phase | 3 phase |
| Supply Frequency | 50/60 Hz |
| Rated Power (High Overload) | 0.75 kW |
| Rated Power (Normal Overload) | 1.1 kW |
| Continuous Output Current | 2.2 A |
| Intermittent Output Current (60s) | 3.5 A |
| Control Algorithm | VVCplus / Sensorless Flux Vector |
| Output Frequency Range | 0 - 1000 Hz |
| Digital Inputs | 8 |
| Analog Inputs | 2 |
| Analog Outputs | 1 |
| Relay Outputs | 2 |
| Enclosure Protection Rating | IP20 |
| Housing Design | Bookstyle B20 |
| Serial Interface | RS-485 |
| Integrated Protocols | Danfoss FC Protocol, Modbus RTU |
| Integrated RFI Filter | Class A1 |
Programming and Configuration
Programming and configuring the Danfoss 175Z0031 centers on parameter adjustment tailored to the connected motor and application. Setup can be performed directly using the detachable Danfoss LCP 2 Local Control Panel (175Z0401). The LCP 2 provides a parameter copy and backup utility, allowing motor nameplate details, ramp times, and I/O assignments to be saved into the keypad memory and uploaded directly into a replacement drive.
For advanced commissioning and system archiving, the drive interfaces with a PC running Danfoss MCT 10 setup software via the RS-485 connection. MCT 10 allows engineers to perform parameter transfers, real-time diagnostic trace logging, and complete drive configuration backups. When preparing a spare unit, matching parameters such as motor frequency, full-load current, VVCplus control settings, and RS-485 communication parameters ensures smooth integration into existing control architectures.
Communication and System Integration
Network connectivity for the Danfoss 175Z0031 is provided by an onboard RS-485 serial port located at control terminals 68 (+) and 69 (-). The drive supports both standard Modbus RTU and native Danfoss FC protocols, allowing direct integration into host PLC networks, SCADA systems, or building automation networks. Communication parameters including station address, baud rate, and bus timeout limits are fully configurable.
The drive integrates comprehensive physical control interfaces, providing 8 programmable digital inputs, 2 multi-function analog inputs, 1 analog current output, and 2 configurable relay contacts. An embedded Class A1 RFI filter limits electromagnetic noise on line feeds, maintaining signal integrity and compliance in industrial cabinet installations.
Diagnostics and Status Indication
The Danfoss 175Z0031 displays operational status through three dedicated LEDs on the front control card assembly. The green ON LED indicates active 24V/15V logic power supply, the yellow WARNING LED signals operating limits such as current or thermal thresholds being approached, and the red ALARM LED indicates trip conditions where output power to the motor is disabled.
Detailed diagnostic information and alarm records are accessible through the LCP 2 panel display or via RS-485 using Danfoss MCT 10 software. Parameter numbers 600 to 605 retain a log of recent alarm events, allowing technicians to analyze trip history, evaluate operating parameters, and perform live tracing during operational troubleshooting.
Status LED Indicators
| LED | Color/Status | Meaning |
|---|---|---|
| ON (Green) | Green - Solid | Mains supply voltage is connected and control board internal logic power supply is healthy. |
| WARNING (Yellow) | Yellow - Solid | Drive is operating in a warning condition (e.g. overcurrent warning, high temperature warning). |
| ALARM (Red Flashing / Solid) | Red - Flashing or Solid | Drive has tripped on a fault condition. Motor output is disabled. |
Replacement and Spare Part Considerations
When replacing a Danfoss 175Z0031 drive, verify that the replacement shares the identical model string VLT5001PT5B20STR3D0F00A00C0 and IP20 Bookstyle B20 frame dimensions. Installing a replacement unit requires restoring the exact parameter set from the original drive, including motor nameplate data, acceleration/deceleration profiles, I/O mapping, and RS-485 network parameters.
Parameters can be loaded into a replacement unit by transferring data stored in an LCP 2 keypad (175Z0401) or restoring a backup file using Danfoss MCT 10 software. When migrating from legacy VLT 5000 systems to current product lines, Danfoss recommends the VLT AutomationDrive FC 302 series as the replacement successor.
Error Codes & Fault Codes
The following error codes may be displayed during operation or diagnostics:
| Code | Name | Description | Possible Cause | Recommended Action |
|---|---|---|---|---|
| Alarm 2 | Live zero error | Signal on analog input 53 or 54 dropped below 50% of preset minimum value (e.g. 4-20mA wire break). | Broken signal wire, disconnected sensor, incorrect scaling in analog input settings. | Check input wiring and signal source. Verify 4-20mA loop integrity. |
| Alarm 4 | Mains phase loss | Missing phase on supply side or severe input voltage imbalance. | Blown line fuse, tripped supply breaker, missing line phase voltage, severe line imbalance. | Measure supply voltage across terminals L1, L2, L3 under load. Check main fuses. |
| Alarm 5 | Voltage warning high | Intermediate circuit DC link voltage exceeds upper warning threshold. | High mains supply voltage, motor regenerative braking back to drive. | Check AC line voltage. Check deceleration time settings or install dynamic brake resistor. |
| Alarm 6 | Voltage warning low | Intermediate circuit DC link voltage drops below lower warning threshold. | Low mains supply voltage, line voltage dip, transient power drop. | Check AC supply voltage and mains line stability. |
| Alarm 7 | Overvoltage DC link | Intermediate circuit voltage exceeds maximum safety limit and drive trips. | Deceleration ramp time too short, motor regenerated power overload, supply voltage surge. | Extend deceleration time parameter, enable overvoltage control (OVC), or fit brake option. |
| Alarm 8 | Undervoltage DC link | Intermediate circuit voltage drops below minimum shutdown limit. | Mains power loss, severe undervoltage fault, blown internal pre-charge resistor/relay. | Verify mains voltage level and wiring. |
| Alarm 9 | Inverter overload | Electronic thermal inverter protection has reached 100% load limit. | Sustained overload above drive rated continuous output current. | Reduce mechanical motor load, check machine mechanics for binding. |
| Alarm 10 | Motor ETR overtemperature | Electronic Thermal Relay (ETR) calculated motor temperature threshold exceeded. | Motor run continuously at low speed high load without external cooling fan. | Check motor loading, verify motor parameters, inspect motor cooling fan. |
| Alarm 11 | Motor thermistor | PTC thermistor connected to control board detected motor overheating. | Motor overtemperature, thermistor wire disconnected, faulty sensor. | Check motor temperature and thermistor input connection on control card. |
| Alarm 12 | Current limit | Output current exceeded programmed torque/current limit value for longer than permitted time. | Heavy mechanical load, rapid acceleration time, wrong motor parameter settings. | Increase acceleration time, inspect load mechanism for obstruction. |
| Alarm 13 | Overcurrent | Peak output current limit exceeded (instantaneous hardware trip threshold). | Short circuit on motor cables, ground fault, rapid load change, wrong motor setup. | Disconnect motor cables and megger motor and cabling. Inspect for short circuits across output phases U, V, W. |
| Alarm 14 | Earth fault | Discharge current from output phases to ground exceeds trip threshold. | Ground fault in motor windings or motor power cabling. | Check motor insulation resistance to earth with an insulation tester. Check motor lead wires. |
| Alarm 15 | Switch mode power supply failure | Internal 24V/15V Switch Mode Power Supply (SMPS) voltage on power card is out of tolerance. | Internal power supply circuit board failure or short circuit on 24V control output terminals. | Disconnect external 24V DC terminal wiring. Internal hardware fault — if error persists, return unit for repair or replace drive. |
| Alarm 16 | Short circuit | Short circuit detected across output power terminals U-V, V-W, or U-W. | Direct phase-to-phase short circuit in motor or output cabling; shorted IGBT output module. | Check output motor cabling for insulation breakdown. Internal hardware fault — if cables intact, internal power stage failure occurred. |
| Alarm 17 | Standard bus timeout | No serial communication received on built-in RS-485 bus within configured timeout period. | Broken RS-485 line, host PLC communication stopped, incorrect baud rate or station address. | Inspect serial cable connection, check master PLC status and communication parameters. |
| Alarm 29 | Heatsink overtemperature | Power card IGBT heatsink thermal sensor exceeded safe operating limit. | Clogged heatsink fins, cooling fan failure, ambient temperature too high, enclosure ventilation blocked. | Clean heatsink cooling channels, replace faulty internal cooling fan, lower ambient temperature. |
| Alarm 30 | Motor phase U missing | Current missing on motor output phase U. | Broken conductor on phase U cable, damaged terminal connection, open motor winding. | Check motor connection on terminal U / 96 and measure winding resistance. |
| Alarm 31 | Motor phase V missing | Current missing on motor output phase V. | Broken conductor on phase V cable, damaged terminal connection, open motor winding. | Check motor connection on terminal V / 97 and measure winding resistance. |
| Alarm 32 | Motor phase W missing | Current missing on motor output phase W. | Broken conductor on phase W cable, damaged terminal connection, open motor winding. | Check motor connection on terminal W / 98 and measure winding resistance. |
| Alarm 36 | Internal fault | Internal DSP microprocessor or memory checksum hardware error. | EEPROM fault, control card microcontroller hardware failure, corrupted firmware. | Internal hardware fault — perform power cycle reset. If fault recurs, replace control card or complete drive unit. |
| Alarm 37-45 | Internal hardware fault | Internal communication or ASIC logic check fault between control card and gate driver power card. | Ribbon cable connection failure or internal circuit board defect. | Internal hardware fault — return unit for service or replace drive. |
Frequently Asked Questions
How do I transfer parameters to a replacement Danfoss 175Z0031 drive?
Parameters can be transferred using the detachable Danfoss LCP 2 control panel (175Z0401) by executing a parameter upload from the old drive and downloading it to the replacement unit. Alternatively, parameters can be saved and transferred via PC using Danfoss MCT 10 setup software over the RS-485 interface.
What power ratings and supply voltages does the 175Z0031 support?
The Danfoss 175Z0031 operates on a 380–500 V AC 3-phase supply at 50/60 Hz. It features dual ratings: 0.75 kW (1.0 HP) with 160% overload for constant torque applications and 1.1 kW (1.5 HP) with 110% overload for variable torque loads.
What protocols are supported on the built-in RS-485 interface?
The integrated RS-485 interface located at terminals 68 and 69 supports both Modbus RTU and standard Danfoss FC fieldbus protocols.
How can I check past alarm codes on the Danfoss 175Z0031?
Alarm history is stored in Parameters 600 through 605 and can be accessed on the LCP 2 keypad display or viewed via Danfoss MCT 10 software connected over RS-485.
What is the recommended replacement series if upgrading from VLT 5000?
When upgrading legacy installations to current equipment standards, Danfoss recommends migrating from the VLT 5000 series to the Danfoss VLT AutomationDrive FC 302 series.
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