Arc Machines 205 WDR - Manual (Page 6)

M O D E L 2 0 5
O P E R A T O R ’ S M A N U A L
2 2 2 2
All AMI Power Supplies contain a “bleeder” circuit to ground any residual potential
after welding or after an aborted or bad arc start attempt. These circuits take a few seconds
to operate or could fail.
The electrode should always be considered a possible shock hazard. This is
especially true when the system is in “weld sequence”, ready to weld, is welding or has just
finished welding. Equipment/component failure, system abuse or improper maintenance
could result in electrical potential at the weldhead even when not in “weld sequence”.
The users/operators of this equipment must take all precautions necessary to avoid
contact with the ELECTRODE at “ALL TIMES”. The only exception is when actually
replacing or adjusting the electrode and this should be done WITH THE POWER TURNED
OFF.
If performed with the power “ON” the system must be in “TEST” mode out of weld
sequence and the USER MUST OBSERVE COMMON SAFETY PRACTICES such as
grounding the electrode to ensure discharge before actually touching it.
Most AMI Power Supplies feature High Frequency (HF) Arc Starting. This is a High
Voltage/High Frequency electrical transmission process. To eliminate any HF shock
possibility “AVOID ALL CONTACT” with the Welding WORK (ground), the ELECTRODE or
the WELDHEAD during arc start.
Remember, there is a possible shock hazard in all welding power supplies at
ALL times.