CandCNC
Page 16
For Plasma Units that have NO external connector for the required
signals OR do not have an internal voltage divider.
Mounting the RAV-02 Card inside your Plasma Cutter:
Do any mounting or modification with the
Power cord DISCONNECTED to the plasma unit
The mounting location for the card will vary from one type/brand of plasma
unit to another. Pick a location and mount the RAV-01 using the Plexiglass shield
using small self tapping screws (not furnished) or adhesive Velcro strips. Mount
the card at least 1 inch away on all sides from any internal cards, terminals or bare
wires. The standoffs of the card are insulated and so the card can be mounted
with the plexiglass shield against the chassis. There is high voltage present when
the torch fires at the end of the card where the RAW ARC VOLTS (tip Volts) is connected.
Keep that end of the card away from ANY conductive object closer than 2 inches.
Once you have the RAV-01 Card mounted in a safe location you will need
to make provisions to connect the two low voltage cables (CCAB-31 and SAC-01).
You need to provide holes on the rear or side of the unit (BE CAREFUL DRILLING
METAL IN YOUR UNIT. TINY SHAVINGS CAN FALL ON PARTS THAT COULD
SHORT.) Ream the holes smooth or drill them oversized and use a rubber
grommet to protect the wires. Clean up with a magnet or blow the cabinet out
with air. One hole needs to be able to pass the diameter of the SAC-01 Plug. The
other needs to pass the diameter of the cable for the CCAB-31. NOTE: The
4 wide plug on the CCAB-31 cable is removable. You will need to remove the
end that passes into the enclosure to fish the wire through for the RAV-01 Connection.
BE SURE TO FOLLOW THE COLOR CODE TO REATTACH THE CONNECTOR.
THE COLORS ON BOTH ENDS WILL GO ONTO THE SAME TERMINAL/PIN
NUMBER. Connect the two cables where the diagram shows to the RAV-01 Card.
Making the connections
A WORD ABOUT ARC OK SIGNALS: “ARC OK” is our terminology of a signal coming back
from the plasma unit that signals the unit has fired the torch and has a valid arc. Most plasma
units made for manual cutting DO NOT HAVE an ARC OK (also known as ARC XFR;
TRANSFER; OK to MOVE and other similar terms). It is a circuit that closes (relay contacts or
sometimes called “dry contacts”) on a valid arc. Units that do have the signal will have it
labeled, on a connector or covered in their manual. IF YOU HAVE DOUBTS, assume the unit
does NOT have ARC OK and follow the guidelines below.
IF YOUR PLASMA HAS AN ARC OK CONNECTION POINT: There will be two connection points.
Run a small gauge (18-24 ga) pair of wires from the internal ARC OK points to the two screw
terminals on the edge of the RAV-01 Card. This wire carries no high voltage or current. Follow the
diagram on Page ____. There is a board labeling program on some cards where the white printing
is WRONG! USE THE PICTURES IN THIS MANUAL to make the connection. Make sure the
connection is secure and that no stray wires are outside the opening of the screw terminals.
IF YOUR PLASMA DOES NOT HAVE AN ARC OK CONNECTION POINT: Turn to the section on
the DCP-01 Digital Current Probe option. You will need to purchase and install this option to
provide a reliable ARC OK signal to your DTHCII system.
CONNECTING to YOUR PLASMA
RAV-02 Raw Arc Voltage Divider Option
E
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