0 items in your basket
Total £ 0.00 EX VAT
Multi Process Welders
MIG Torches
TIG Torches
Welding Helmets
Welding Gloves & Clothing
MMA Electrodes
MIG Wire
Shop 55,000 Products
SERVICEDEPT.
RAPID BLOG
FEEDBACK
HIRE
MEL operation panel
Answers on identifying, choosing and safely fitting internal and mechanical spares for an inverter welding power source.
Circuit boards can be damaged by static electricity that you cannot feel. Keep the new board in its anti-static bag until you are ready to fit it, and ground yourself before touching it, ideally with a wrist strap, as service guidance for electronic boards advises.Handle it by the edges, avoid touching components and connectors, and put the old board straight into an anti-static bag. Only work on the machine once it is isolated from the mains and any stored energy has been dealt with, following the maker's service instructions.
Power sources of this type can hold stored electrical energy in capacitors for some time after they are switched off and unplugged. Isolating the machine from the mains is not enough on its own.The waiting time and the way of checking that the machine is safe depend on the design, so follow the maker's service instructions rather than a general rule of thumb. This kind of work should be done only by a competent person, since mistakes can cause fatal electric shock.
The transformer converts and isolates the electrical power inside the machine, and the choke smooths the current. They are heavy, electrically critical parts, and a failed one is usually a sign of an overheating, overload or cooling problem that should be traced first.They must be matched exactly to your machine type, and fitting them involves removing covers and working near high-voltage circuits. Leave this to a competent person, ideally the maker or an authorised service agent, as HSE guidance suggests for specialised equipment.
A PTC resistor is a component whose resistance rises with temperature. In power electronics it is often used to limit current or to sense heat, which helps protect other parts. Its exact job in a given machine is set by the design.Because its value and temperature rating decide when it acts, fit only the type listed in the parts list for your machine. A part with a different rating may not protect the circuit properly. Replacement involves opening the machine, so follow the competent-person and isolation advice.
