Fixing Stuck Spools: Solving Residual Magnetism in 4V210-08

The Ghost in the Machine: Solving Residual Magnetism Issues

Is your Airtac 4V210-08 staying energized even after the PLC signal is cut? This "sticky" behavior is often caused by residual magnetism in the solenoid armature.

1. Why Magnetism Lingers

After long periods of continuous energization, some low-quality or aged solenoid stems can retain a magnetic charge. This prevents the spring from pushing the armature back, keeping the 4V210-08 in the "On" position.

2. The Professional Fix

• Inspect the Armature: Clean the solenoid stem of any oily residue that might cause surface tension.
• Check Voltage Ripple: Ensure your DC24V supply is stable; high ripple current can accelerate magnetic retention.
• Replace the Coil: If the problem persists, the internal spring may have weakened. Swapping for a new genuine Airtac coil usually solves the issue immediately.