| Accumulative Running Time Arrival | Refer to the time given by accumulative power-on time arrival P5.1.00 of the frequency inverter |
|
ERR24 – Accumulative Running Time Reached
What this means
ERR24 indicates that the VFD has reached a user-defined accumulated running time limit.
In simple terms, the VFD is tracking how long the spindle has actually been running (not just powered on), and a preset runtime threshold has been reached. When that threshold is met, the VFD triggers ERR24.
This is not a failure and does not indicate damage or abnormal operation.
Why This Happens
Many VFDs include runtime tracking features used for:
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Maintenance scheduling
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Service reminders
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Usage tracking
ERR24 is triggered when the accumulated spindle runtime reaches the value set by parameter P5.1.00.
This differs from ERR23, which tracks total power-on time. ERR24 only counts time when the spindle is actively running.
Most Common Causes We See
1. Maintenance reminder threshold reached (most common)
ERR24 is often intentionally configured to:
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Notify users of maintenance intervals
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Track bearing or coolant service schedules
The VFD is behaving exactly as configured.
2. Feature enabled unintentionally
In some setups:
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Runtime tracking was enabled during initial configuration
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Parameters were copied from another machine
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Default values were not cleared
Users may not realize the runtime limit was active.
3. High spindle usage
Machines that:
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Run long jobs
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Operate frequently
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Stay in production workflows
Will naturally reach the accumulated runtime threshold sooner.
What to Check First
Step 1: Verify the accumulated runtime limit
Check:
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P5.1.00 – Accumulative running time limit
This value determines when ERR24 will trigger.
Step 2: Decide whether this feature is useful
Ask:
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Do you want runtime-based maintenance reminders?
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Is this feature relevant to your workflow?
For many CNC users, this is optional.
Step 3: Clear or reset the runtime record
If maintenance has been completed or the reminder is not needed:
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Use the parameter initialization function to clear the accumulated runtime record
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Reset the VFD
This will clear ERR24.
What ERR24 Is Not
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Not a spindle motor fault
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Not an electrical or wiring issue
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Not a cutting load problem
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Not a controller or software issue
ERR24 is a time-based notification, not a fault condition.
Recommended Action for CNC Use
Most CNC users:
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Reset this timer when ERR24 appears
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Or disable the accumulated runtime fault entirely
This prevents unnecessary interruptions during normal operation.
Summary
ERR24 means the VFD has reached a preset accumulated spindle runtime limit.
Most common causes:
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Maintenance reminder threshold reached
-
Feature enabled unintentionally
This is informational, not a failure.
Clearing or resetting the runtime record resolves the issue.
