ESAB 653 cvcc, Instruction Manual

Page: 34 / 54

34
5.3 Inspection and Service
Keep the power source dry, free of oil and grease, and protected at all times from damage by hot metal and sparks.
5.3.1 Fan Motor
Keep the fan motor free of accumulated dust and lint.
5.3.2 Transformer
Other than periodically cleaning the dust and dirt from the transformer, no maintenance is required. Ensure that only clean,
dry, low pressure air is used.
5.3.3 Wire Feeder and Control Circuits
These circuits are protected by two 10 amp circuit breakers mounted in the front panel. If these open, the contactor and
wire feeder will not operate.
5.3.4 Over Temperature Protection
If the power source reaches an abnormally high internal temperature, the thermal protection will deenergize the contactor
circuit, shutting down the power source but leaving the cooling fan on. After the power source has cooled to a safe level,
the thermal protection will automatically reset. While de-energized, the contactor and wire feeder cannot be operated.
5.3.5 Digital Voltmeter/Ammeter Calibration
To verify the accuracy of the digital volt/ammeter combination, the following calibration procedure can be performed
periodically:
1. Place the Panel/Remote switch in Panel position.
2. Disconnect cables from the output terminals and then connect an accurate DC voltmeter to the output terminals.
3. Place the Contactor switch in the On position.
4. With the primary input power on, turn the Voltage control knob until you get 25V on the DC voltmeter. Compare the
reading with the reading on the digital voltmeter on the front panel.
5. If there is a difference in the voltage readings, open front control panel by removing the two mounting screws from
the upper corners, remove meter board from its four mounting posts, and adjust the trimpot (R13) on the meter board
with a small screwdriver until the digital meter reading matches the DC voltmeter reading. When satisfied, reassemble
meter board and front control panel.
SECTION 5 MAINTENANCE