No Gas Flows From The Torch - Cebora PLASMA PROF 164 HQC Service Manual

CEBORA S.p.A.

3.3.5 - No gas flows from the torch.

To check the efficiency of the pneumatic circuits, we recommend performing the "Gas seal"
test, (see Instruction Manual).
During the test the pneumatic circuits are individually charged and discharged with gas. The
gas discharge takes place through the torch nozzles.
The test consists of three phases that are repeated in the sequence described in the table:
- DISCHARGE - pneumatic circuits are discharged from the gas present in the Gas Console;
- CHARGE - the circuits are placed under pressure one at a time;
- SEAL - the circuit is kept under pressure for 1 minute, to detect any gas leaks. Once this time
has elapsed the circuit is discharged.
To obtain these functions the solenoid valves are activated at different times, based on the
circuit to be tested (see fig. 2.6.1).
Phase
1 Discharge all of the circuits.
2 Circuit 1 load (air).
3 Circuit 1 seal (air).
4 Circuit 1 discharge (air).
5 Circuit 2 load (N2).
6 Circuit 2 seal (N2).
7 Circuit 2 discharge (N2).
8 Circuit 3 load (O2).
9 Circuit 3 seal (O2).
10 Circuit 3 discharge (O2).
11 Circuit 4 load (H35).
12 Circuit 4 seal (H35).
13 Circuit 4 discharge (H35).
SOLENOID VALVE TEST.
With Power Source powered, set up the "Gas seal" test of all pneumatic circuits: press the key
(I) on Gas Console to enter the set-up menu, press the key (A) to select "Test" (led (A3) lit),
turn knob (C) to show "ALL" on display (D).
Press the key (I) to begin the test. The various phases are shown on the displays (D)(F) and
(M) of the Gas Console.
On each solenoid valve, check the coil terminals, voltage = 25 Vac when the solenoid valve is
powered (see table).
♦ Make sure gas is present at the inlet fittings of the Gas Console, and that pressure
and flow rate in the supply lines meet the specification values for the Plasma
PROF 164 (see specifications in the Instruction Manual).
♦ Check operation of the pressure regulator and pressure transducers; replace if
defective.
♦ Make sure that the gas lines of the extension art. 1183, the torch and Gas Console
are not clogged, locating the circuit in question with the aid of the table and fig.
2.6.1.
3.302.218
Function
Correct?
NO
NOTE
Solenoid valves open (powered).
V20, V21, V22, V23.
V01, V03, V04, V05, V06.
V20, V21, V22, V23.
V02, V03, V04, V05, V06.
V20, V21, V22, V23.
V08, V09.
V20, V21, V22, V23.
V20, V21, V22, V23.
YES
-
-
-
V10.
-
23
9/8/2006