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Revision to Wiring and hardware differences from RAMPS etc

Tony

* One bed heater wire to the BED- pin on the Duet bed heater terminal block
* Other bed heater wire to the +ve output of the bed heater PSU
* -ve output of the bed heater PSU to the -ve side of the [[Glossary_of_Terms#VIN|VIN]]VIN terminal block (marked GND) (the -ve input from the main power supply goes here too).
* -ve output of the bed heater PSU to the -ve side of the [[Glossary_of_Terms#VIN|VIN]]VIN terminal block (marked GND) (the -ve input from the main power supply goes here too).
* Do not connect the bed heater PSU +ve output to the Duet.
 

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