Tweco Thermal Arc TA 500 - Manual (Page 28)

Operation 3-2 Manual No 0-0470
10 13
15
14 11 12
16
VOLTS
D.C.
100 200 300 400
500 AMPERES
D.C.
100 200 300 400
500
AC POWER
1FU 2FU 3FU 4FU
HI-FLOW
WATER SHIELD
ON
OFF DC POWER
PILOT
AUTO
MAN
SURFACE
UNDERWATER
DO NOT SWITCH
UNDER LOAD
Figure 3-B TA-500 Power Supply Front Panel
10. AC POWER Indicator
Red light indicates that Primary AC power is be-
ing supplied to the Power Supply.
NOTE: Fan should be running when this light is
on.
11. DC POWER Indicator
Red light indicates that main contactor (W) has
closed to supply current to the main bridge recti-
fier and that cutting current is available.
12. PILOT AUTO/MAN Switch (SW9)
With the switch in the MAN position the pilot arc
will start two seconds after the green START but-
ton is pressed and will stay on for 2 seconds only.
The main cutting arc must transfer in this time. If
the pilot arc goes out press the red STOP button,
and the green START button to recycle the torch.
The torch must be recycled after each cut to start
the pilot arc again. In the AUTO position the pilot
arc will remain on until the cutting arc is transferred
and will restart when the cutting arc goes out.
13. SURFACE/UNDERWATER Switch (SW8)
Selects the proper resistance value of the pilot re-
sistor for the type of cutting operation.
NOTE: Do not switch under load.
14. HI-FLOW WATER SHIELD ON/OFF Switch (SW8)
The ON position activates the circuitry for the hi-Flow
Water shield (optional) control. The OFF position deac-
tivates the circuit.
15. Voltmeter
Indicates the voltage between the torch electrode
and the workpiece (voltage on main bridge recti-
fier). Useful in troubleshooting.
16. Ammeter
Indicates amount of cutting current being supplied
from the Power Supply to the torch.
19 17 18
20
21
PLASMA SECONDARY COOLANT
WATER
SHIELD
GAS
Figure 3-C Supply Console Front Panel
17. PLASMA Gauge
Indicates pressure at which plasma gas is being sup-
plied to the torch.
18. SECONDARY Gauge
Indicates pressure at which secondary gas is being
supplied to the torch.
19. SECONDARY Flowmeter
Indicates flow rate at which secondary water is
being supplied to torch.
20. GAS/WATER SHIELD Switch (SW7)
Used to select either gas or water as a secondary.
21. COOLANT Gauge
Indicates pressure at which coolant is supplied to
the torch.