Tweco 3000 Merlin - Manual (Page 41)

Manual 0-2532 4-9 OPERATION
4.07 Optional Power Supply Settings
The following functions can be used to tailor a system
for special application requirements or unique user pref-
erences. These functions are controlled by DIP switches
located on the Logic Control PC board in the power sup-
ply. Locate the Logic Control PC Board under the front
panel access cover and set the functions as required.
A. Auto-Restart Enable (SW1)
ON
OFF
1 2
SW1
A-00991 Logic PC Board
Figure 4-8 Auto-Restart Enable Switch SW1
Location
Auto-restart, when enabled, provides an immediate
pilot arc restart during post-flow if the torch is brought
within range of the workpiece. Auto-restart can be
switched off so that the torch must be reactivated
(via torch switch or control device) to restart the pilot
arc each time the main arc is interrupted. This set-
ting may be useful if the system is used to replace
other units which do not have auto-restart, or for use
with motion control devices. In some applications,
torch parts life may be improved by disabling auto-
restart to reduce excessive pilot arc time.
NOTE
Either pole set to 1 (on) disables auto-restart
function.
Auto-Restart
Function
SW1-1
Position
SW1-2
Position
Enabled 0 (Off) 0 (Off)
Disabled 0 (Off) 1 (On)
Disabled 1 (On) 0 (Off)
Disabled * 1 (On) 1 (On)
* = Factory Setting
B. Auto-Restart Mode (SW2)
ON
OFF
1 2
SW2
A-00992 Logic PC Board
Figure 4-9 Auto-Restart Mode Switch SW2 Location
Normal mode provides an immediate pilot restart
whenever the main arc is interrupted and the Auto-
Restart Enable switch SW1 is set to ENABLE. De-
layed mode provides a gas pre-flow each time be-
fore the pilot arc restarts. In some shape-cutting
applications, it may not be desirable to immediately
restart the main arc after the torch passes beyond
the desired cutting line (or between cuts).
NOTE
Either pole set to 1 (on) sets delayed auto-
restart function.