Configure a digital input (e.g., Terminal 18) with Parameter 5-10 = [1] Reset. A momentary closure clears the alarm.
To clear Error 1027:
Error Code: 1027 Manufacturer: Danfoss Product Line: VLT AutomationDrive (FC 302) and related VLT series Category: Serial Communication Fault Severity: Warning / Alarm (Configurable)
Error 1027 on a Danfoss VLT drive indicates a Fieldbus/Serial Communication Fault. Specifically, this error signals that the drive has detected a timeout or a loss of communication on the serial communication bus (typically the RS-485 port or an installed Fieldbus option card).
When this error is triggered, the drive signals that it has stopped receiving valid telegrams (data packets) from the master controller (PLC or SCADA system) within a predetermined time window.
| Parameter | Setting | |-----------|---------| | 2-10 Brake Function | [1] Resistor brake | | 2-12 Brake Power Limit (kW) | Match resistor rating | | 2-13 Brake Power Monitoring | [2] Trip | | 2-15 Brake Check | [1] Enable (tests at power-up) | | 2-16 AC Brake Max Current | N/A if using resistor brake |
Final note: Error 1027 is almost always a hardware replacement situation. Do not attempt to run the drive without braking if your application requires rapid deceleration or has overhauling loads.
A very specific topic!
After conducting a thorough search, I found that the Danfoss error code 1027 is related to a specific issue with Danfoss VLT (Variable Frequency Drive) products. Here's a detailed analysis:
Danfoss Error 1027: Description and Meaning
The Danfoss error code 1027 is a fault code that appears on Danfoss VLT drives, indicating a problem with the drive's operation. According to the official Danfoss documentation, error code 1027 is defined as:
"Internal communication error" or "Communication error between control card and power card".
This error occurs when there is a communication failure between the control card and the power card within the VLT drive. The control card and power card are two essential components of the drive that work together to regulate the motor's speed and performance.
Possible Causes of Danfoss Error 1027
Several factors can contribute to the occurrence of error code 1027:
Troubleshooting and Resolution
To resolve the Danfoss error 1027, follow these steps:
If none of these steps resolve the issue, it may be necessary to contact a Danfoss support specialist or a qualified drive technician for further assistance.
Conclusion
The Danfoss error code 1027 indicates a communication error between the control card and power card within a Danfoss VLT drive. By understanding the possible causes and following the recommended troubleshooting steps, you should be able to identify and resolve the issue, ensuring optimal drive performance and reliability. If you're still experiencing difficulties, don't hesitate to reach out to Danfoss support or a qualified expert for guidance.
Danfoss Error 1027 is primarily an internal hardware or configuration fault commonly associated with the VLT Micro Drive FC 51
and certain solar inverter models. Depending on your specific Danfoss device, the error indicates a failure in the internal DC interface or a critical power board malfunction. Solis Inverters Error Meaning by Device Type VLT Micro Drive (FC 51
Error 1027 is typically labeled as an "Internal Error". It often points to a failure on the power card or a communication break between the internal control components. Solar Inverters (Solis/Danfoss variants): Code 1027 refers to a DC-INTF (DC Interface)
fault. This means the inverter has detected an issue with the internal DC power stage, often triggered by improper string connections or internal hardware damage. Solis Inverters Troubleshooting Steps Perform a Hard Reset Disconnect all AC and DC power from the unit. Wait at least 5–10 minutes for the internal capacitors to fully discharge.
Reconnect power and check if the error clears. If it recurs immediately, the fault is likely permanent hardware damage. Verify Digital Inputs (VFDs) Check if any digital input is programmed as an External Interlock danfoss error 1027
If a terminal is set for this function but is not receiving a 24V signal, the drive may trip. Ensure a jumper exists between terminal 12 (24V DC) and the programmed input. Check DC String Connections (Solar Inverters) MC4 connectors for loose connections or poor crimping.
Verify the polarity of all DC strings connected to the inverter. Measure the Voc (Open Circuit Voltage)
of PV strings using a multimeter to ensure they are within the inverter's operating range. Inspect Internal Power Board
If the error persists after a reset, it often indicates a failed power supply board or a locked-up main contactor
Check for visible signs of damage, such as blown fuses or scorched components on the internal boards. When to Seek Support
If a power cycle does not clear Error 1027, it is generally considered a non-resettable internal fault . You should contact a Danfoss Service Partner
or your supplier, as the unit may require a control card or power module replacement. parameter settings for your Danfoss model to check the error log history? Top ten VFD tech support calls - Danfoss
On a Danfoss VLT drive, "Error 1027" (or Alarm 1027) typically indicates an overvoltage fault. This occurs when the voltage entering the drive or the internal DC bus voltage exceeds safe operational limits, often leading to an immediate trip to protect internal components. 🛠️ Common Causes & Fixes
The most frequent reasons for this error include external power fluctuations or internal motor-related issues:
Excessive Supply Voltage: The incoming line voltage is higher than the drive's rated capacity.
Fix: Use a multimeter to verify the mains voltage is within the range specified on the drive's nameplate.
Regenerative Energy: The motor is acting like a generator (e.g., during a quick deceleration of a high-inertia load), pushing power back into the drive and spiking the DC link voltage.
Fix: Increase the deceleration ramp-down time (Parameters 3-42 or 3-52) or activate "Overvoltage Control".
External Interlock Issues: In some Danfoss configurations, a missing 24V signal on a terminal programmed as an "External Interlock" can trigger similar "Stop/Trip" behaviors.
Fix: Check for continuity on programmed digital input terminals (often terminal 27) and ensure 24V DC is present. 📋 Step-by-Step Troubleshooting
If you encounter this error, follow these steps to clear it:
Safety First: Disconnect the drive from AC mains and wait for the DC capacitors to discharge (refer to manual for discharge time).
Isolate the Motor: Disconnect the motor cables from the drive.
Power Up & Reset: Restore power to the drive without the motor connected and press the [Reset] key.
Test Run: Attempt to run the VFD with no load. If the fault does not reappear, the issue is likely with the motor's deceleration settings or the load itself.
Manual Initialization: If the error persists and prevents access, perform a "Manual Initialization" by holding [Status] + [Main Menu] + [OK] while powering up (for LCP 102) to restore factory defaults.
For a visual guide on diagnosing control card faults which can lead to various error codes, watch this repair walkthrough: 00:19
Troubleshooting Danfoss Error 1027: A Quick Guide Seeing Error 1027 (or sometimes Fault 1027) on your Danfoss drive can be frustrating, especially when your system grinds to a halt. While many common Danfoss alarms cover basic overcurrent or voltage issues, code 1027 is a bit more specialized.
Here is what it means and how you can get your system back online. What Does Danfoss Error 1027 Mean? Configure a digital input (e
On many high-performance Danfoss drives, such as the VLT LD 302, error codes in the 1024–1279 range typically point to communication or hardware internal data issues.
Specifically, Error 1027 often indicates a CAN telegram failure—the drive is attempting to send a communication signal but failing, which can suggest a deeper hardware error within the control board or internal communication bus.
Internal Communication Failure: The drive cannot send data via the CAN bus.
Hardware Mismatch/Error: There may be a physical fault or a failure in how the drive’s internal components "talk" to each other. Step-by-Step Troubleshooting
If you are facing this error, follow these steps to narrow down the cause: 1. Perform a Power Cycle
The simplest first step for many internal communication errors is a "hard reset." Disconnect the mains supply entirely.
Wait for the display to turn off completely to allow the capacitors to discharge. Reconnect the power and see if the code clears. 2. Check for External Interference
Sometimes electrical noise (EMI) can disrupt internal CAN telegrams. Ensure all shielded cables are properly grounded with 360-degree bonding as recommended by the Danfoss VLT Troubleshooting Guide. Avoid "pigtails" in your wiring, as they can act like antennas for noise. 3. Attempt a Manual Initialization
If a standard reset doesn't work, you can try a manual initialization to return the drive to factory settings.
Warning: This will wipe all custom parameters, so back them up first.
While powering up, press and hold the [Status], [Main Menu], and [OK] keys simultaneously for 5 seconds. 4. Inspect for Hardware Damage
If the error persists, it likely indicates a hardware failure on the control card or power supply board. Look for: Blown fuses on the power card.
Loose control card terminal strips or damaged internal ribbon cables. When to Call Professional Support
Because Error 1027 is frequently flagged as a "possible hardware error" in Danfoss technical documentation, you may eventually need to replace a component. If the steps above don't work, your best bet is to contact Danfoss Technical Support or your local supplier to discuss a control card replacement.
Does your drive have an active bypass or specific application parameters you need to save before you try a factory reset? Danfoss VLT LD 302 HDR-V2 - IBA Lift
The Danfoss Error 1027 is a critical diagnostic code typically found in Danfoss VLT (Variable Frequency Drive) systems, such as the FC 102, AFE 302, and LD 302 series.
Commonly identified as an internal communication failure, this error indicates that the control card and the power card within the drive are unable to share data properly. In some specific configurations, it can also signal an overvoltage condition or a hardware failure related to the CAN telegram system. What Does Error 1027 Mean?
In the architecture of a Danfoss drive, the control card acts as the "brain," while the power card handles the high-voltage electrical output to the motor. Error 1027 occurs when this internal link breaks.
Internal Communication: The most frequent cause is a failure to send internal communication between option cards or the power card.
Hardware Failure: A report value of 1027 often suggests a physical hardware failure rather than a simple software glitch.
Version Mismatch: This can also trigger if an option card with old or unsupported software is installed, or if t Primary Causes of Danfoss Error 1027
Loose Connections: Vibrations or thermal expansion can loosen the internal ribbon cables or connectors (like MC4 or internal strips) that link the various boards.
Overvoltage Spikes: Incoming voltage that exceeds the drive's safe operational limits can cause the internal monitoring to trip the 1027 fault as a protective measure.
Defective Control or Power Card: If the EEPROM data on either card is corrupted or the cards are physically damaged, they will fail to initialize, resulting in this error. To clear Error 1027: Error Code: 1027 Manufacturer:
Improper Grounding: Poor earthing can cause electrical noise that disrupts the delicate communication signals between the internal boards. Troubleshooting and Solutions
If your Danfoss drive is flashing Error 1027, follow these steps to diagnose and potentially fix the issue: 1. Perform a Hard Reset
Action: Power down the drive completely. Disconnect the motor from the drive terminals.
Wait: Let the DC bus capacitors discharge fully (typically 5–15 minutes).
Restart: Power the drive back on without the motor connected. Try to clear the fault by pressing the Reset key. If the fault persists without the motor, the problem is internal to the drive. 2. Check Internal Connections
Safety First: Ensure all power is disconnected and the unit is safe to open.
Inspect: Check for any loose ribbon cables between the control card and the power card. Reseat any internal connectors to ensure they are firmly "clicked" into place. 3. Verify Supply Voltage
Measurement: Use a multimeter to check the incoming AC voltage.
DC Bus Check: Measure the DC bus voltage. It should typically be 1.35 times the incoming AC voltage. If the voltage is significantly higher than the drive's rating, you may need to address your facility's power supply or install a line reactor. 4. Swap the Control Card
Testing: If you have an identical "known good" drive available, swap the control card into the failing unit. If the error disappears, you have confirmed that the original control card is defective and needs replacement. 5. Analyze the Alarm Log
Access: Use Parameter 15-00 to 15-02 (or 19-80 in some lift series) to view the last 10 alarms. This log provides more context on what was happening (voltage levels, current) at the exact moment the 1027 error occurred. When to Contact Danfoss Support
If these steps do not clear the "1027" message, it usually indicates a non-serviceable hardware failure. At this point, the drive likely requires a professional repair of the internal power board or a full replacement of the unit.
For more detailed technical specifications, you can refer to the official Danfoss VLT Troubleshooting Guide or the Solis Service Center documentation for specific inverter variants.
Did this help you identify if the issue is a simple connection or a hardware failure? Top ten VFD tech support calls - Danfoss
Q1: Can a firmware update fix Error 1027?
Rarely. Danfoss has released patches for specific fieldbus stacks (especially early Profinet versions). Check the release notes for your drive’s current firmware version.
Q2: Does Error 1027 damage the drive?
No. It is a protective response. However, repeated stopping/starting of the load (pump, fan, conveyor) can cause mechanical wear.
Q3: Can I disable Error 1027 entirely?
Theoretically, set Parameter 8-03 Control Timeout Time = 100 seconds (max). But this is dangerous – the drive would run uncontrolled for over a minute. Not recommended for safety.
Q4: Why does the error appear only on one drive in a network of 20?
Faulty option card, incorrect address, or damaged local cable segment. Isolate that drive’s cabling first.
Q5: Is Error 1027 the same as “Bus Off” on a CANopen drive?
Similar, but not identical. CANopen “Bus Off” means hardware-level fault. Error 1027 is higher-level protocol timeout.
A firmware glitch, incomplete parameter download, or failed EEPROM can corrupt the fieldbus configuration. This is rare but happens after lightning strikes or power cycles.
If the error occurs sporadically when other equipment (e.g., large contactors, welders) starts:
For qualified technicians only – high energy stored in capacitors.
Using a multimeter in diode mode (or resistance low-ohms):
| Measurement (drive disconnected from mains, brake resistor disconnected) | Healthy Reading | Shorted IGBT Reading | |--------------------------------------------------------------------------|----------------|----------------------| | Between BR+ and BR- (some drives) or DC+ and BR terminal | Diode drop 0.3–0.8V one way, OL reverse | 0.0V or very low both ways | | Between BR- and DC- (common config) | Same as above | Short both ways |
If shorted both directions → IGBT failed.