Tweco N7500 - Manual (Page 42)

SYSTEM OPERATION 5-6 Manual 89250890
N7500 SYSTEM OPERATION
9. Use the up or down “Mode Selector” or buttons to scroll to “Travel Delay.” See “Figure 5-9: Travel
Delay Screen.”
Press the “OK” OK button and rotate the potentiometer dial to adjust the time delay for any time
length between 0 and 6.0 seconds.
Press the “OK” OK button to set the Travel Delay time setting.
ART# A-10828_AB
Menu Setting
Travel Delay
Parameter Guide
Voltage 42.0V
Figure 5-9: Travel Delay Screen
Travel Delay Setting
Approximate
Setting
Electrode Size
Target Depth
Inches mm
0.0 5/16” (7.9 mm) through 3/4” (19.05 mm) 1/8 3.2
0.5 5/16” (7.9 mm) through 3/4” (19.05 mm) 1/4 6.4
1.0 5/16” (7.9 mm) through 3/4” (19.05 mm) 5/16 7.9
1.5 3/8” (9.53 mm) through 3/4” (19.05 mm) 3/8 9.5
2.0 1/2” (12.7 mm), 5/8” (15.88 mm), 3/4” (19.05 mm) 1/2 12.7
2.5 5/8” (15.88 mm), 3/4” (19.05 mm) 5/8 15.9
3.0 3/4” (19.05 mm) 11/16 17.5
3.5 3/4” (19.05 mm) 3/4 19.0
4.0 3/4” (19.05 mm) 7/8 22.2
Table 5-10: Travel Delay Setting
10. Use the up or down “Mode Selector” or buttons to scroll to “No Current Detect”. See “Figure
5-11: No Current Detect screens“.
The N7500 System contains a “No-Current Detect” circuit. This circuit monitors Arc Current. Should the
arc increase or decrease outside set limits or the arc stop, the “No-Current Detect” circuit will shut down
the gouging sequence. “Normal” mode is preset from the factory.
This program can be set for one of three response levels:
NORMAL - Setting provides 0.4 second System shutdown delay.
SPECIAL - Setting provides 0.8 second System shutdown delay.
OFF - System continues to operate regardless of Arc Current level. System shutdown is manually
controlled.