M O D E L 2 1
O P E R A T
I O N M A N U A L
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7.0 MAINTENANCE
Always disconnect the AC power cable from the line voltage before
attemp
ting to work on this welding power supply.
There are no user serviceable components located inside the M21 weld heads. Do not
open the unit in an attempt to repair it. Contact Arc Machines, Inc. if the unit is
malfunctioning, or suspected of being broken. As such, no wiring diagram or internal
circuit drawing is provided.
7.1 CLEANING AND MAINTENANCE
All of the connectors at the end of the cable must be kept clean
and free of grease,
oil, dirt or other contaminants. Keep the cap on the electrical multi-pin connector
when not in use.
From time to time, depending on the cleanliness of the tube/pipe being welded, the
type and quality of the arc gas and the number of welds done, the rotor and weld
head housing will build up soot, which should be cleaned on a regular basis.
1. Use isopropyl alcohol and Scotch Brite or steel wool to clean both brass (male
and female) power and ground connectors. Rinse off all debris and dry before
reconnecting.
2. Use a clean lint-free cloth and isopropyl alcohol to clean the rotor, (black) rotor
guide ring, weld head housing and view window.
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