Donatoni Macchine
Technical troubleshooting sheet Emergency diagnostic procedure

PE0015SPINDLE OVERCURRENT

Before proceeding, carefully read the

SAFETY INSTRUCTIONS

DescriptionSpindle overcurrent alarm

SeverityModerate02 / 05

Authorized personnelMachine operator

Required PPE:

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Description

During automatic working cycles, the PLC may generate a spindle overcurrent alarm when the maximum load capacity of the relevant motor is exceeded. The threshold is set according to the type of machining and therefore to the spindle speed.

Normally, start a machining operation and observe the saw blade/milling cutter current draw; then set the threshold value 3/5 A higher than the value drawn during normal operation.

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Symptoms

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Possible causes

  1. An incorrect alarm threshold value has been set for the type of machining;

  2. Spindle current draw is too high due to machining at excessively high speeds.

  3. Tool not suitable for the type of machining being performed

  4. Bearings to be replaced

Possible solutions

  1. Correct the ampere threshold value

  2. Gradually reduce the speeds until the correct speeds are found

  3. Check whether the tool is suitable for the machining operations being performed and whether it is excessively worn and therefore no longer cuts properly

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