How to Protect Your PLC from Power Surges and ESD

How to Protect Your PLC from Power Surges and ESD

PLCs are vital but vulnerable to electrical threats. Power surges (from lightning or motors) can cause immediate damage, while Electrostatic Discharge (ESD) from simple contact can degrade electronics over time. A layered protection strategy is essential.

Key Protection Layers with Phoenix Contact:

1. Main AC Power: Install a VAL-US Series surge protector at the panel entrance to stop high-energy surges.

2. DC & I/O Circuits: Use compact PT-IQ Series protectors on DIN rails to safeguard 24V power and sensor/actuator lines.

3. Data Lines: Protect sensitive communication ports (Ethernet, PROFIBUS) with TRABTECH line protectors.

Critical Foundation: Ensure a solid, low-impedance ground for all protectors and use shielded cables connected properly. This defense system is a small investment that prevents costly downtime and equipment failure.