Amada HF-2500A, Operation Manual, Page: 96 / 164

CHAPTER 6: MAINTENANCE
HF-2500A HIGH FREQUENCY WELD CONTROL
6-8 990-371
Section III. Maintenance
Electrode Maintenance
When a welding schedule has been suitable for a particular welding application over many welds, but poor
quality welds are now resulting, electrode deterioration could be the problem. If you need to increase
welding current to maintain the same weld heat, the electrode tip has probably increased in surface area
(mushroomed), effectively increasing weld current density, thus cooling the weld. Try replacing the
electrodes.
The rough surface of a worn electrode tip tends to stick to the work pieces. So, periodic tip resurfacing
(dressing) is required to remove pitting, oxides and welding debris from the electrode. You should limit
cleaning of an electrode on the production line to using a # 400-600 grit electrode polishing disk. If you
must clean a badly damaged tip with a file, you must use a polishing disk after filing to ensure the electrode
faces are smooth.
The best method of preventing electrode problems is to regularly re-grind electrode tip surfaces and shapes
in a certified machine shop.
Parts Replacement
Below is a list of the replacement parts for the Power Supply. All items listed are a quantity of 1 each.
WARNING:
Only qualified technicians should perform internal adjustments or replace parts. Removal
of the unit cover could expose personnel to high voltage and may void the warranty.
Part Description AMADA WELD TECH Pt # Location
Input Power Line Protection Fuses F1 and F2:
HF-2500A/240
HF-2500A/400
HF-2500A/480 330-071
330-092
330-092
Rear Panel
Power Supply Power Protection Fuse F1 330-078 Power PCB
Input Power Selection Plug Set:
240 Volts
400 Volts
480 Volts 4-34314-01
4-34315-01
4-34316-01
Welding
Transformer Chassis
Section IV. Repair Service
If you have problems with your Power Supply that you cannot resolve, please contact our service
department at the address, phone number, or e-mail address indicated in
CONTACT US
in the front of this
manual.