Banner EZ-SCREEN LS — Red Status & Lockout Recovery

Banner Engineering · beginner · 20 min

A Banner EZ-SCREEN LS with a red status or flashing-red Lockout is telling you why with an error code. Read it, fix the blocked beam or the OSSD/reset wiring fault, and use the alignment indicators.

⚠️ A light curtain is a protective device — never bypass it. A red status means the outputs are off for a reason; read the error code and fix the real cause, then the outputs re-enable.

Read the status indicator

A Banner EZ-SCREEN LS safety light curtain has a bi-color red/green status indicator that shows whether power is applied and whether the safety outputs (OSSDs) are ON or OFF:

• Green — clear, outputs ON.
• Red — outputs OFF (a beam is blocked, or a fault).
• Flashing RED = Lockout, shown together with a displayed error code that names the specific fault.

So when it's red, the first thing to do is read whether it's a simple blocked beam (green returns when clear) or a flashing-red Lockout with an error code.

Blocked beam vs. alignment

The EZ-SCREEN LS has bi-color alignment indicators that help you find the location of a blocked beam and judge overall alignment. Use them to:

• Find and clear whatever is obstructing one or more beams (a part, fixture, or debris in the field).
• Re-align the sensor and receiver if the curtain won't make green even with the field clear — the indicators guide you to a good alignment across the whole field.

Common Lockout error codes

• Output Error — one or both OSSD outputs are shorted to the power supply (high or low), or OSSD 1 is shorted to OSSD 2. Inspect the output wiring for a short.
• Reset Input Error — the Reset switch is closed (or its wiring is shorted to +24 V) during power-up. The reset input must not be active at power-on; fix the switch/wiring.
• Receiver Error — caused by excessive electrical noise or an internal failure. Diagnose it: disconnect the OSSD loads and reset the receiver — if the error clears, the problem is in the OSSD load(s) or load wiring; if it continues with no load connected, replace the receiver.

Step-by-step

1. Read the status: solid red (blocked/output off) vs. flashing red Lockout + error code.
2. Blocked beam: use the alignment indicators to find and clear the obstruction; green returns when clear.
3. Won't align: use the bi-color alignment indicators to re-aim sensor/receiver across the full field.
4. Output Error: inspect OSSD wiring for a short (to supply, or OSSD1–OSSD2).
5. Reset Input Error: ensure the reset switch/wiring isn't active/shorted to +24 V at power-up.
6. Receiver Error: disconnect OSSD loads and reset — clears → load/wiring fault; persists with no load → replace the receiver.

Verify

With the beams clear, alignment good, and any wiring fault fixed, the status returns to green and the OSSD outputs turn on. If a Lockout error persists, re-read the error code and address that specific cause.

Never do this

Never short, jumper, or bypass the OSSD outputs or the reset input to clear a Lockout. The error codes exist to catch exactly these wiring faults — fix the real cause and re-validate the safety function.