Tweco 1000 Merlin(Sept1999) - Manual (Page 37)

Manual 0-2731 33 OPERATION
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 SW5-1 SW5-2
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 sec-
onds and must be reset either to 3.4 or 4 seconds as re-
quired 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