Load creep after brake application indicates that holding torque is not being fully transferred to the load. Start by confirming whether the brake itself is slipping: check lining condition (worn, glazed, contaminated), spring force (fail-safe brakes), air gap/clearance, and friction surface condition (disc/brake wheel scoring, heat damage). A controlled static holding test at rated load is often the fastest confirmation.
Next, rule out drivetrain slip that can mimic brake slip: coupling slippage, keyway damage, loose hubs, gearbox internal issues, or a drum/rope anchoring problem. If the brake locks the shaft but the load still moves, the fault may be downstream (drum, rope, reeving).
Rivedi anche il timing di controllo nelle gru a VFD: se l'applicazione del freno avviene prima che la coppia sia stabilizzata, può verificarsi una breve deriva. L'azione correttiva deve affrontare la causa principale—mai "stringere fino a che tenga" senza verificare i limiti di progetto e i fattori di sicurezza.
