10) FINAL INSPECTION OF POWER SOURCE
AND SETTINGS
Precautions
(also see chapter 3)
1) live parts (bare wires, HF terminals, …)
2) moving parts (fan …)
3) parts that get hot (heat sinks …)
Instruments required
(also see chapter 4):
1) digital multimeter with end of scale = 1000Vdc
2)class 2.5 or higher clamp-on AC/DC ammeter with end of
scale = 300Adc
3) instead of the clamp-on ammeter, you can insert the shunt
on the earth lead and select the mVdc scale for the multi-
meter, then connect the multimeter to the shunt's measuring
terminals
WARNING!:
do not perform striking in TIG HF mode
with the multimeter connected to the shunt or
power source's output terminals, as if might be
damaged!
10.1)
Preliminary checks
Conditions
- Machine unplugged, ON/OFF switch set to "O".
- Top cover removed.
- Solder-jumper K2 on board 15.14.250 open.
- Board HF (15.14.286) inserted in its tracks but disconnected
from bus board (15.14.285/15.14.315)
- TIG torch not connected
- Bypass pipe connected (if cooling unit fitted) (see sect. 3).
Checks
- Make sure all boards (except the HF board) are inserted pro-
perly
- Inspect boards visually (including any components sticking
out whose pins might have been bent inadvertently)
- Inspect the various wiring and relevant connections visually
- Check dip switches on board 15.14.236:
200 TLH
panel FP106 (1=0/OFF; 2=1/ON; 3=1/ON; 4=1/ON)
200 AC/DC
panel FP122 (1=0/OFF; 2=1/ON; 3=1/ON; 4=0/OFF)
10.2)
Checks on startup
Conditions
- Machine connected to 230Vac supply, set ON/OFF switch to
"I".
Checks
- Correct initialization of front panel (green LED lit), no alarm
(yellow LED unlit) and no error message on display.
- Relay RL1 on board 15.14.250 closes approx. 2 seconds
after switch is closed.
- Reset front panel with parameter 9 in Setup (see section 8):
the power source automatically switches to TIG DC 2T HF
mode with current set to 100A.
- Make sure the fan is working properly and airflow is correct
(directed towards front).
- Correct lighting of LEDs on main-board 15.14.250:
* NOTE: torch trigger not connected
10.3)
Check UPFR section on main-board 15.14.250
Conditions
- Machine connected to 230Vac power supply, ON/OFF
switch set to "I".
Checks
- Voltage between TP20 and TP10 on board 15.14.250 at
+385 ± 5 Vdc.
- Green LED L10 blinking fast.
10.4)
Checking inverter gate signals on main-board 15.14.250
Conditions
- As point above, with TIG torch connected.
Checks
- Make sure output power is enabled by pulling TIG torch's
trigger, that green LEDs of the 4 gates L13/L14/L15/L16 on
mono-board 15.14.250 light, and that the green power ena-
bling LED L11 also lights.
Make sure relay RL1 on bus board 15.14.285/15.14.315 is
triggered and that the cooling unit (where connected) is
switched on simultaneously.
- Select operating mode MMA, make sure the above-mentio-
ned LEDs L11/ L13/L14/L15/L16 blink.
10.5)
Checking open circuit voltage OCV
Conditions
- TIG torch not connected.
- Machine switched off for last five minutes, more or less, and
unplugged.
- Make sure K1 is open on main-board 15.14.250.
- Close K2 on main-board 15.14.250.
- Plug the machine into 230Vac power supply, set ON/OFF
switch to "I".
- MMA mode.
Checks
- open circuit voltage OCV in MMA +52 ± 2Vdc (measured
on fixed output sockets or on output filter board 15.14.238)
10.6)
Checking thermal cutout operation
Conditions
- As point above.
Checks
- Disconnect connector CN4 from board 15.14.250 (thermo-
stat T2) and make sure the thermal cutout trips:
yellow "Alarm" LED on front panel lights;
"E10" alarm message on display;
no open circuit voltage.
- Reconnect CN4 and make sure all functions are operating as
before.
- Disconnect connector CN5 from board 15.14.250 (thermo-
stat T1) and make sure the thermal cutout trips:
yellow "Alarm" LED on front panel lights;
"E10" alarm message on display;
no open circuit voltage.
- Reconnect CN5 and make sure all functions are operating as
before.
- Disconnect connector CN1 from board 15.14.256 (thermo-
stat T3) and make sure the thermal cutout trips (in version
200TLH, T3 is connected directly to connector J6, as there is
no board 15.14.256):
yellow "Alarm" LED on front panel lights;
"E10" alarm message on display;
no open circuit voltage.
- Reconnect CN1 and make sure all functions are operating as
before.
34
34
Final inspection of power source and settings
Power source / Mode LED
Colour Status
ON / TIG*
L1, L2, L3, L4, L5, L6, L7
Green
ON
ON / TIG*
L8, L9, L12
Red
OFF
ON / TIG*
L10
Green
FAST
BLINKING
ON / TIG*
L11, L13, L14, L15, L16
Green
OFF
ENGLISH
