TORMACH PCNC 440 Spindle Stalled
| CONF | DIAGNOSIS | ACTION |
|---|---|---|
|
86%
CONF
|
Spindle Drive Belt
The spindle drive belt transfers torque from the BLDC motor to the spindle cartridge; over time, the Poly-V ribs can glaze or stretch, leading to slippage under load. When the belt slips, the spindle RPM deviates from the commanded value, causing the control software to trigger a safety stall fault to prevent tool breakage. Replacing the belt restores the friction coefficient necessary for maximum torque transmission.
|
|
|
9%
CONF
|
Spindle Drive (VFD)
The spindle drive (Inverter/VFD) manages current flow to the motor and monitors back-electromotive force (BEMF) to regulate speed. If the internal IGBTs or capacitors degrade, the drive may prematurely trip on an over-current fault when the spindle encounters cutting resistance. This electronic stall is a protective measure to prevent the motor windings from overheating when torque demand exceeds the drive's output capacity.
|
|
|
5%
CONF
|
Spindle Motor
Internal shorts or demagnetization of the permanent magnets within the BLDC motor can reduce its torque constant (Kt). This degradation forces the motor to draw more current to maintain speed, eventually exceeding the VFD's trip threshold and resulting in a hard stall during nominal cutting operations.
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DIY Repair Guide
Watch exactly how to replace the Spindle Drive Belt.
// NOTICE:
This report is generated by an Agentic AI Engineer utilizing probabilistic modeling.
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