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Copy file name to clipboardExpand all lines: docs/src/plasma/qtplasmac.adoc
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@@ -517,9 +517,11 @@ More information on contact switching load can be seen on page III of link:https
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[underline]*Calculations:*
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If using a Mesa card, the input resistance of a 7i96 is 4700Ω (always consult the product manual associated with the revision being used as these values sometimes vary between revisions), giving a contact current of 5.1mA assuming a supply voltage of 24V (I = V/R).
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If using a Mesa card, the input resistance of a 7i96 is 4700 Ω (always consult the product manual associated with the revision being used as these values sometimes vary between revisions), giving a contact current of 5.1 mA assuming a supply voltage of 24 V (I = V/R).
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As an example, the typical relay used in a Hypertherm Powermax 65 plasma cutter (link:https://www.te.com/commerce/DocumentDelivery/DDEController?Action=showdoc&DocId=Data+Sheet%7F1308242_T77%7F1011%7Fpdf%7FEnglish%7FENG_DS_1308242_T77_1011.pdf%7F1-1393194-0[TE T77S1D10-24]) requires a minimum contact load of 100mA @ 5VDC which will dissipate 0.5W (P = I * V). If using a 24VDC power supply this would then equate to a minimum current of 20.8mA. Because there is less current drawn by the Mesa input than is required by the relay there needs to be an increase in the current.
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As an example, the typical relay used in a Hypertherm Powermax 65 plasma cutter (link:https://www.te.com/commerce/DocumentDelivery/DDEController?Action=showdoc&DocId=Data+Sheet%7F1308242_T77%7F1011%7Fpdf%7FEnglish%7FENG_DS_1308242_T77_1011.pdf%7F1-1393194-0[TE T77S1D10-24]) requires a minimum contact load of 100 mA @ 5 VDC which will dissipate 0.5 W (P = I * V).
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If using a 24 VDC power supply this would then equate to a minimum current of 20.8 mA.
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Because there is less current drawn by the Mesa input than is required by the relay there needs to be an increase in the current.
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The resistance can be calculated using R = Vs / (Im - Ii) where:
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@@ -528,7 +530,8 @@ The resistance can be calculated using R = Vs / (Im - Ii) where:
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- Im = minimum current required
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- Ii = input current
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Using a 7i96 with an input current of 5.1mA gives a calculated value of 1529Ω. (24 / (.0208 - .0051)). This could then be rounded down to a commonly available 1500Ω resistor giving a small safety margin.
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Using a 7i96 with an input current of 5.1 mA gives a calculated value of 1529 Ω. (24 / (.0208 - .0051)).
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This could then be rounded down to a commonly available 1500 Ω resistor giving a small safety margin.
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The power dissipation can by calculated using P = Vs^2^ / Rs where:
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@@ -1747,7 +1750,7 @@ The maximum percentage allowed is 100%, values above this will be set to 100%.
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If the user intends to use this feature it would be prudent to add *M68 E3 Q0* to both the preamble and postamble of the G-code program so the machine starts and ends in a known state.
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IMPORTANT: *G-cODE THC* AND *VELOCITY BASED THC* ARE NOT ABLE TO BE USED IF *CUTTER COMPENSATION* IS IN EFFECT; AN ERROR MESSAGE WILL BE DISPLAYED.
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IMPORTANT: *G-CODE THC* AND *VELOCITY BASED THC* ARE NOT ABLE TO BE USED IF *CUTTER COMPENSATION* IS IN EFFECT; AN ERROR MESSAGE WILL BE DISPLAYED.
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WARNING: If Cut Feed Rate in the MATERIAL section of the <<qt_parameters-tab, PARAMETERS Tab>> is set to Zero then QtPlasmaC will use *motion.requested-velocity* (as set by a standard Feedrate call in the G-code) for the THC calculations. This is not recommended as it is not a reliable way of implementing velocity based THC.
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@@ -1805,7 +1808,7 @@ To use cutter compensation the user will need to use G41.1, G42.1 and G40 with t
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* *G42.1 D#<_hal[plasmac_run.kerf-width-f]>* : offsets torch to the right of the programmed path
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* *G40* turns the cutter compensation off
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IMPORTANT: IF *CUTTER COMPENSATION* IS IN EFFECT *G-cODE THC*, *VELOCITY BASED THC* AND *OVER CUT* ARE NOT ABLE TO BE USED; AN ERROR MESSAGE WILL BE DISPLAYED.
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IMPORTANT: IF *CUTTER COMPENSATION* IS IN EFFECT *G-CODE THC*, *VELOCITY BASED THC* AND *OVER CUT* ARE NOT ABLE TO BE USED; AN ERROR MESSAGE WILL BE DISPLAYED.
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