Lenel Lnl-3300-m5 Installation Manual Upd Verified -

This indicates a "Manual Lockup" condition. The updated manual states this is often caused by a ground loop between the reader cable shield and the enclosure ground. Solution: Lift the shield ground at the reader side, ground only at the panel.

The enclosure (typically a LNL-1200 or similar) must provide 1.5 inches of clearance above and below the board for heat dissipation. The updated manual strongly warns against mounting the LNL-3300-M5 directly above power transformers. Inductive noise from transformers can corrupt RS-485 bus traffic. Lenel Lnl-3300-m5 Installation Manual UPD