Differences

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--- tool_access_controllers [2024-11-03 21:01] – [Other Components] tim
+++ tool_access_controllers [2024-11-04 22:10] (current) – [Enclosure and Wiring] tim
@@ Line 71: / Line 71: @@
 | 5V 1A power supply | 240V AC-DC, 24V DC-DC from a VFD or 5V from an existing PSU |
 | AC contactor or no-volt switch | |
+| Class X2 suppression capacitor | 0.1uF or 0.22uF, if contactor or motors cause interference |
 ===== Enclosure and Wiring =====
-All of our current tool controllers use the same design, an [[https://www.ebay.co.uk/itm/Multi-Purpose-Waterproof-DIY-Project-Box-Enclosure-Case-IP65-ABS-Blue-Clear/361537022189|IP65 ABS enclosure from RadioWorld]] on eBay.
+All of our current tool controllers use the same design, an IP65 ABS enclosure from RadioWorld on eBay. This no longer available so new controllers will require a different case and a modified mounting frame.
 The PCB, LCD and NFC modules are mounted on a laser-cut acrylic frame using nylon screws and spacers. The front frame is cut from 3mm clear acrylic, and the supports from 2mm clear acrylic. Push buttons are panel-mounted to the front of the enclosure.
@@ Line 93: / Line 94: @@
 More complex tools may have their own control systems (remote start/stop, VFD motor controllers, etc). In these cases we may fit our relay to the incoming contactor or to the control signals loop or to the estop/interlock loop.
+==== Noise suppression ====
+Some motors and contactors will create electrical noise, causing the microcontroller to crash or reset. If this happens the noise should be suppressed at source. A 0.1uF or 0.22uF class X2 capacitor (fitted across live and neutral close to the source) will often resolve the issue.
 ==== Safety Rules ====