Part No. 729-110-040 Rev. 1.41 | June 2016
© 2016 Nelson Stud Welding, Inc. All Rights Reserved.
53
7.2
Routine Maintenance
Prior to commencing any maintenance work the welding unit must be switched
off, disconnected from the input power and secured against restart!
Once cover is removed, check Capacitor Voltage with Volt Meter (DC). Voltage
is accessible across busses. DO NOT TOUCH anything inside until Capacitor Voltage is well below 40VDC.
Only a qualified electrician should perform any work inside the units casing. Any work done should be made in
accordance with all local and national electrical codes. Failure to do so may result in bodily injury or death.
1. Remove the machine wrap-around cover after disconnecting input connector.
2. Keeping the machine clean will result in cooler operation and higher reliability. Be sure to clean the
following areas with a low pressure air stream. See figure D.1 for component locations.
Power and control printed circuit boards
Power switch
Input rectifier
Heat sink fins
Output terminals
Heatsinks may be hot.
1. Examine capacitors for leakage or oozing. Replace if needed.
2. Examine the sheet metal case for dents or breakage. Repair the case as required. Keep the case in
good condition to ensure that high voltage parts are protected and correct spacing is maintained. All
external sheet metal screws must be in place to assure case strength and electrical ground continuity.
3. Replace machine cover and screws.
4. When PCB connectors are disconnected, please use silicone-free electrical grade grease (Nyogel
760G from Nye Lubricants) to all PCB connectors prior to reconnecting. This forms a
corrosion\moisture barrier that will protect the contacts for reliable operations.
Summary of Contents for ArcCharger N550C DOMESTIC
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