YASKAWA MOTOWELD-T300D - Page 47

47
Fig. 12.2 How to Check Gas System
Cause of Problem
Gas hose connection failure
Faulty operation of gas regulator valve and flow rate adjusting knob Magnetic valve is clogged.
Magnetic valve failure
Refer to Fig. 12.1.
Water pressure is not sufficient.
Pressure switch failure
Water pressure detecting circuit failure
Torch selector switch failure
Gas circuit failure Pr (MB2 and IF)
Gas adjusting switch failure
Is torch selector switch set to water cooing?
(Does fault monitor flash?)
Check whether wate
r
- or air-cooled
torch is selected. (Does fault monitor flash?)
Does starting relay 1Y operate?
Is voltage applied to magnetic valves (Nos. 113 to 138)?
Is there a "click" when magnetic valve moves?
Check Items
Set the gas adjusting switch to adjustment.
Gas does not flow even when the welding start signal is turned ON.
Status
No gas flow when gas adjustment selector switch is set to “gas adjustment.”
Gas does not sto
p
.
Gas flows.
Gas does not flow
.
No
Yes
No
Yes
(
LED1 lit?
)
Yes
No
Water cooling torch (Flashes.)
A
ir cooling torch
Y
es
(water colling) (Flashes.)
No (air cooling)