• 1. Help with malfunctions: An overview of our error messages
  • 1.1 Overload during lifting or lowering
  • 1.2 Runtime monitoring hydraulics
  • 1.3 Doors not locked
  • 1.4 Plug-in railings not installed
  • 1.5 Limit switch fault
  • 1.6 Emergency stop circuit interrupted
  • 1.7 Motor protection switch triggered
  • 1.8 Platform stuck
  • 1.9 Toe protection safety strip triggered
• 2. Your error message is not listed?

Ideally, errors should not occur at all. However, if a malfunction does happen, one thing is crucial: The error must be quickly identified and resolved to avoid prolonged downtime.

Malfunctions can have various causes – from overloads to technical defects. While it’s impossible to completely eliminate all potential sources of error, we have taken measures to provide you with quick and effective assistance in case of a malfunction.
Below, you’ll find an overview of the most important error messages that may appear on your PLC control system display – including possible solutions.
When troubleshooting, always follow the safety instructions in the operating manual!

If there is too much weight on the platform of the scissor lift table or column lift, the system will trigger a safety shutdown. To resume operation, follow these steps:

1. Remove the overload: Reduce the weight until the permissible maximum load is reached.
2. Press the reset button: Press the reset button to reset the system.

After completing these steps, the load transport can continue as usual.

The error message "Runtime monitoring hydraulics" indicates either a faulty sensor or a leak in the hydraulic circuit.

For example, if the upper limit switch of a scissor lift is defective, the control system does not receive confirmation that the platform has reached the upper position. In this case, the hydraulic unit remains active, causing the hydraulic oil to overheat. This can eventually lead to the failure of the gear pump.

To prevent such excessive heating of the hydraulic oil, we have programmed a typical cycle time into the control system. If this time is exceeded, the system stops and displays the "Runtime monitoring hydraulics" error message.

What to do when this error occurs?

1. Check the cause: Inspect the sensors and hydraulic circuit for defects or leaks.
2. Contact support: If the cause is not immediately apparent, get in touch with us. Here’s where to find your contact person.

This error message indicates that not all doors could be properly locked. This could mean either:

• one or more doors are still open, or
• a door has been manually unlocked in an emergency.

What to do?

1. Check door status: Ensure that all doors are closed and correctly locked.
2. Reset manual unlocking: If a door was manually unlocked, restore the lock to its normal operating state.

Once all doors are securely locked, the system can resume normal operation. If the issue persists, please contact our technical support team.

Diese Fehlermeldung zeigt an, dass nicht alle Steckgeländer korrekt eingesetzt wurden. Das System erkennt dies und stoppt den Betrieb aus Sicherheitsgründen.

This error message indicates that not all plug-in railings have been correctly installed. The system detects this issue and halts operation for safety reasons.

Solution:

1. Check the plug-in railings: Inspect whether all plug-in railings are properly positioned in their designated places.
2. Install the railings: Securely insert any missing plug-in railings.

Once all plug-in railings are fully installed, operation can resume as usual.

In the context of runtime monitoring, we’ve already discussed that a defective limit switch may fail to activate. But what happens if the limit switch remains permanently active?

A jammed roller lever can cause the limit switch to stay triggered continuously. The system detects this issue by checking the sensors for logical switching combinations.
For example: If the limit switches for the first and second floors of a goods lift are simultaneously active, this indicates a fault. In this case, the control system displays the error message “Limit switch fault,” as such a switching combination is not possible during normal operation.

What to do when this error message appears?

1. Inspect the mechanics of the limit switch: Check if the roller lever is jammed or stuck.
2. Clear the blockage: Carefully try to return the switch to its normal position. Avoid applying excessive force to prevent damage.
3. Check the alignment: Ensure that the switch is properly positioned and that there are no mechanical obstacles causing it to stick.

If you cannot resolve the issue or feel uncertain, contact our technical support to avoid damage or safety risks. We’ll be happy to assist you.

The error message "Emergency stop circuit interrupted" indicates a fault in the emergency stop circuit, which may stop the operation of the system for safety reasons.

Possible causes:

1. Emergency stop button activated: One of the emergency stop buttons has been deliberately or accidentally triggered.
2. Other sensors or switches (e.g. bimetal, light barrier) have been triggered.

Solution:

1. Check the emergency stop button: If no hazardous situation exists, unlock the emergency stop button by turning the key (if available) and pulling the button out. Then press the reset button.
2. Inspect sensors and switches: Electrical system maintenance should only be carried out by qualified personnel! Check all safety devices, including bimetals or motor protection switches in the control cabinet.

If the error message persists, please contact our technical support. Our experts will help you quickly identify and resolve the issue.

The motor protection switch protects the electric motor from overheating and mechanical damage. It trips when an overload occurs, causing the current in the windings to become too high.

What to do?

1. Check the motor: Ensure the pump operates smoothly and the motor has no bearing damage. Also, inspect the coupling between the motor and the gear pump for visible damage.
2. In case of an electrical fault: Electrical system work should only be performed by qualified personnel! A phase failure might cause the increased motor current.
3. Reset the switch: Once the cause has been resolved, reset the motor protection switch to restart the system.

If you are unsure or the error message appears again, please contact our technical support. We are happy to assist you.

The error message "Platform stuck" indicates a monitoring issue with the logical states of the hydraulic system. Even when the lift table platform is empty, the pressure in the hydraulic system should not be 0 bar. The reason is that both the platform and the lifting system have their own weight, which always generates some pressure.

If a pressure of 0 bar is detected in the system during the lowering process, this indicates that the platform may be stuck.

What to do when this error message appears:

1. Check for mechanical blockages: Inspect the platform and guides for any obstacles or blockages that might be preventing it from lowering. For example, are there foreign objects in the shaft?
2. Remove the blockage: Carefully remove any obstacles or blockages, following the safety instructions provided in the operating manual.
3. Inspect the lift table: Check for visible damage to the lifting mechanism.

If the issue persists, please contact our technical support team for assistance with troubleshooting.

Scissor lift tables are typically equipped with an all-around toe protection safety strip to prevent crushing hazards between the platform and adjacent areas, such as a pit edge.

This error message indicates that the toe protection safety strip has been activated. For safety reasons, further lowering of the platform is prevented, while raising the platform remains possible.

Possible causes:

1. Unintentional activation: The toe protection safety strip was triggered accidentally.
2. Obstacles in the work area: An object or limb is located between the platform and the underframe.
3. Safety edge malfunction: The toe protection safety strip is responding without any external influence.

Solution:

1. Inspect the area: Ensure that no objects or limbs are in the danger zone. If the safety strip has been pressed due to obstacles, use the lift button to relieve the compression.
2. Press the reset button: After clearing the danger zone, press the reset button to restore the system. The lift table can then be operated normally.
3. Check for malfunction: If the toe protection safety strip responds without external influence, have a professional check for potential issues such as a cable break.

If you need further assistance, contact technical support.

Nearly all our products are unique. While we often rely on predefined modules, custom programming may be required for specific orders. As a result, your specific error message may not be included in this overview.

How we can help:
If this is the case, don’t hesitate to contact us directly. Our technical support team is available to assist you in resolving the issue quickly and efficiently. Get in touch with our team here.

Self-help options:
If you would like to find the cause yourself first, we recommend our article
Common faults, their causes and possible solutions.
This resource offers additional tips and guides that might help you resolve the problem on your own.