Tweco 1000 CE Merlin - Manuel (Page 43)

Manual 0-2731 4-9 OPERATION
The High/Low Speed Auto-Restart switch, SW5, has two set-
tings as follows:
• Low Speed - adds a one-tenth second delay to the
pilot restart to prevent arc back conditions.
• High Speed - no delay required as it may delay
starting on the next edge.
A-02258
Logic PC Board
SW5
1 2
Figure 4-8 High/Low Speed Auto-Restart Switch SW5
Location
Select the desired function as shown in the following chart:
High/Low Speed Auto-Restart Function
Speed SW 5-1 SW 5-2
High 0 (OFF) 0 (OFF)
Low * 1 (ON) 1 (ON)
* = Factory Setting
NOTE
The ON position is in the direction of the arrow on
the PC Board next to the switch.
B. Gas Pre-Flow Delay (SW3)
The pre-flow delay allows time for gases to flow to the
torch when the torch is activated. Pre-flow is immedi-
ately followed by pilot arc initiation. Gas Pre-Flow De-
lay is set depending on the total torch lead length used in the
system. All power supplies are factory set at 2 seconds and
must be reset either to 3.4 or 4 seconds as required if total torch
lead length in the system is over 60 ft (18.3 m).
A-02288
Logic PC Board
SW3
1 2
Figure 4-9 Gas Pre-Flow Delay Switch SW3 Location
Select the proper gas pre-flow time for the total torch lead length
as shown in the following chart:
Pre-Flow
(Seconds)
Total Torch
Lead Length
SW3-1 SW3-2
2 *
0 - 60 ft
(0 - 18.3 m)
1 (ON) 1 (ON)
3.4
61 - 85 ft
(18.6 - 25.9 m)
1 (ON) 0 (OFF)
4
86 - 125 ft
(26.2 - 38.1 m)
0 (OFF) 0 (OFF)
Gas Pre-Flow Delay Function
* = Factory Setting