Differences

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--- tool_access_controllers [2023-03-07 00:23] – [Software] tim
+++ tool_access_controllers [2024-11-04 22:10] (current) – [Enclosure and Wiring] tim
@@ Line 23: / Line 23: @@
   * Welder
   * CNC Router
+  * Juki Sewing Machine
 Planned:
@@ Line 46: / Line 47: @@
 | D2 | ESD protection diode | 1 | Farnell 2317508 (ESD5Z3.3T1G) |
 | Q1, Q2 | N-channel MOSFET SOT-23 | 2 | Farnell 2069541 |
-| C3 | 10uF capacitor | 1 | |
+| C3 | 10uF 0805 10V+ | 1 | |
 | R1, R6, R7, R13 | 10K 0603 | 3 | |
 | R3, R4 | n/a | | burden resistor, easier to fit one externally |
@@ Line 63: / Line 64: @@
 | 20x4 LCD module with I2C backpack | by convention we use black text on a yellow backlight, which is more readable than white on blue |
 | [[https://www.elechouse.com/elechouse/index.php?main_page=product_info&products_id=2276|PN532 NFC module]] | Buy direct from Elechouse, clones have poor read range and a high failure rate |
-| Two push buttons | CPC SW03314 |
+| Two push buttons | CPC SW03314, but others can be used |
 | Current transformer | [[https://www.ebay.co.uk/sch/DL-CT08CL5-20A|DL-CT08CL5-20A]] plus 33R burden resistor |
@@ Line 70: / 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.
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 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 ====