Tweco SC10 - Manual (Page 30)

OPERATION 4-4 Manual 0-2479
4. A start signal is sent to the Plasma Power Supply
and the Standoff Control PLASMA ON indicator
turns ON. The pilot starts after pre-flow and im-
mediately, if the initial height is correct, the cut-
ting arc is established at which time the Plasma
Power Supply sends an OK-To-Move signal to the
Standoff Control through the Remote Control.
5. Receiving the OK-To-Move signal from the
Plasma Power Supply starts the PIERCE DELAY.
As the PIERCE DELAY ends the OK-To-Move sig-
nal is sent to the cutting machine controller
through the Remote Control starting the horizon-
tal travel.
NOTE
Torch height is not controlled automatically.
6. The piece is cut then the cutting machine removes
the start signal. The arc goes out removing the
OK-To-Move from the Plasma Power Supply.
7. When both the start and OK-To-Move signals are
removed (allows for current ramp down for sys-
tems that have that feature) the retract timer is
activated to rapidly raise the torch up to clear ob-
structions, such as cut out pieces that tilt up, while
traversing to the next piece to be cut. The amount
of retract is set from zero to 100% by the END OF
CUT RETRACT Control. The torch remains re-
tracted until the sequence repeats with the next
start signal.
D. Fully Manual Mode (AUTO HT and FIND HT
Indcators OFF)
NOTE
Initial height is set manually and controlled manu-
ally during cutting. PIERCE DELAY is still ac-
tive and the arc volts display indicates actual arc
volts but the ARC VOLTS control will not change
the standoff.
1. The cutting machine controller sends a start sig-
nal to the Standoff Control through the Remote
Control (RC6010).
2. A start signal is sent to the Plasma Power Supply
and the Standoff Control PLASMA ON indicator
turns ON. The pilot starts after pre-flow and im-
mediately, if the initial height is correct, the cut-
ting arc is established at which time the Plasma
Power Supply sends an OK-To-Move signal to the
Standoff Control through the Remote Control.
3. Receiving the OK-To-Move signal from the
Plasma Power Supply starts the PIERCE DELAY.
As the PIERCE DELAY ends the OK-To-Move sig-
nal is sent to the cutting machine controller
through the Remote Control starting the horizon-
tal travel.
4. The piece is cut then the cutting machine removes
the start signal. The arc goes out removing the
OK-To-Move from the Plasma Power Supply.
E. Starting Off The Plate (Workpiece)
When starting off the plate (running edge start) FIND
HT indicator should be OFF and height set manu-
ally. AUTO HT indicator is normally ON to control
height after the cut starts.
When starting off the plate no motion signal (OK-To-
Move) will be generated to move the torch over the
metal. The Remote Control (RC6010) has an internal
dip-switch SW2-1 and SW2-2 which when turned on
generates OK-To-Move when the pilot starts (actu-
ally when the power supply is enabled. We are as-
suming pilot starts with no delay). The standoff con-
trol won’t try to regulate height until the real
OK-To-Move occurs (and the PIERCE DELAY ends)
after the torch reaches the metal and the cutting arc
is established. Some PIERCE DELAY may be required
to allow time for the arc voltage to stabilize before
trying to regulate. SW1 (refer to Section 3.08, Inter-
nal Selections) on the Standoff PC Board could be
used but isn’t as good as it will try to regulate height
after the PIERCE DELAY even if the arc is not trans-
ferred.
If FIND HT indicator is ON the OK-To-Move signal
from the pilot start is disabled so it is possible to do
both pierce and off the plate starts by leaving the Re-
mote Control internal switch SW2 set to ON and se-
lecting FIND HT for piercing. In this case do not use
FIND HT for off the plate starts.
NOTE
Refer to the Remote Control (RC6010) Instruction
Manual 0-2478 for more information on setting
the internal switches in the Remote Control As-
sembly.