Thermal Arc ARCMASTER 300 AC/DC, Руководство по обслуживанию

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300ACDC
11
ADVANCED TROUBLESHOOTING
11 – 10
b) Verify the connection between High Frequency
(HF UNIT1) and the current limiting resistor
(R2).

Verify the connection between HF UNIT1 and
the current limiting resistor (R2), confirm that
the quick-disconnect terminals are inserted
onto the terminals of HF UNIT1 (TB3-TB4)
correctly and completely.

Confirm there are no short circuits, burnt or
broken wires between the HF UNIT1 and the
current limiting resistor (R2).
c) Verify the connection between the terminals
between AC1-AC2 (TB1-TB2).

Verify the connection between AC1-AC2,
confirm that the quick-disconnect terminals
are inserted onto the terminals of HF UNIT1
correctly and completely.

Confirm there are no short circuits, burnt or
broken wires between AC1 and AC2.
d) Verify and replace the Gap (GAP) of the High
Frequency Unit (HF UNIT1).

Confirm that the GAP is connected to HF
UNIT1 correctly and completely.

Confirm there is no dust or foreign debris
between the space of the GAP.

If there are any abnormalities observed with
the GAP, replace the GAP.

A setup of a gap is 1.0mm.
In the case of a gap 1.0mm or more, high fre-
quency voltage and a period increase.
In the case of a gap 1.0mm or less, high fre-
quency voltage and a period decrease.
e) Verify and replace the Current limiting Resistor
(R6) on HF UNIT1.

If R6 is defective (blown, burnt, cracked,
etc.), replace R6.

Refer to section 12.3.17.
f) Replace the High Frequency Unit (HF UNIT1).

Refer to section 12.3.29.
g) Replace PCB3 (WK-5548).

Refer to section 12.3.3.
4
Fault Isolation Tests
4.1 Preparation
The following initial conditions must be met
prior to starting any of the procedures in this
section.
1) Connect the appropriate input voltage.
(Check the name tag on the rear of the
power supply for the proper input voltage.)
NOTE
Operate at all input voltages as noted on the name-
plate on the rear panel when testing the power sup-
ply.
2) Remove the Side Panel. Refer to the sec-
tion 11.1.1.
3) Close primary power source wall discon-
nect switch or circuit breaker.
4) Place power supply MAIN CIRCUIT
SWITCH (S1) on rear of the unit in the ON
position.
WARNING
Dangerous voltage and power levels are present
inside this unit. Be sure the operator is equipped
with proper gloves, clothing and eye and ear pro-
tection. Make sure no part of the operator's body
comes into contact with the work piece or any inter-
nal components while the unit is activated.