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The CNC bypasses or shields the hardware interlock. It suppresses the ALM 701 alarm, allowing the machine axes to move despite a reported fan fault. Why Changing Parameter 8901 Offers Better Field Flexibility
Are you currently troubleshooting a specific , or are you looking to optimize high-speed machining settings? PARAMETER MANUAL
When the control unit's upper fan motor fails or slows down, the CNC triggers . This alarm is a safety mechanism designed to prevent the internal electronics from overheating and suffering permanent damage. Why Use Parameter 8901?
Maintenance personnel often mistake an message for a deep hardware failure inside the main servo amplifier module or motherboard circuitry. By flipping Parameter 8901#0 to 1 , you can instantly test if the alarm clears. If it clears, you have isolated the issue to a simple, external physical fan motor or its power wire connector—saving hours of complex component testing. 2. Enables Temporary Emergency Production fanuc parameter 8901 better
This combination is widely considered by Fanuc field service engineers as the “better” configuration for precision, reliability, and speed.
Fanuc parameter is a maintenance setting used to control the detection of fan motor errors. It is most commonly modified to bypass the ALM701 (Fan Motor Overheat) alarm, which occurs when a control unit fan fails or runs too slowly. Understanding Parameter 8901#0
⚠️ The Golden Rule: Use it for Triage, Not a Permanent Fix The CNC bypasses or shields the hardware interlock
Change this value from 0 (Alarm active) to 1 (Alarm shielded).
However, always pair this adjustment with proper AICC configuration, appropriate acceleration limits (parameter 1735), and the right precision level for your application. The best results come from a — test, measure, adjust, and repeat.
When 8901#0 is flipped to 1 , the CNC system ignores the low RPM signal coming from the hardware sensor. This clears the flashing text off the Multi-Display Interface (MDI) panel, returning the CNC to a "Ready" state. PARAMETER MANUAL When the control unit's upper fan
It is generally used to set the detection state of the cooling fans, specifically for the main cabinet or Servo/Spindle amplifiers.
The standard setting. If the control unit's upper fan motor fails or slows down, the CNC triggers , which usually freezes the machine to prevent overheating. Bit 0 (Value = 1):