16
CAUTION
The SCR Contactors can be damaged if you attempt to fire this welder without sufficient electrode force.
The use of squeeze time in quantities sufficient to allow the air cylinder to actuate the electrodes and
sufficient air pressure to establish the appropriate tip force is required to insure against damage caused by
an open firing. It is further recommended that the two stage footswitch be used to insure that the welding
electrodes have reached the appropriate position before the activation of the second stage of the
footswitch used to activate the welding program once the program has been initiated it cannot be aborted.
If an SCR contactor has been damaged, it is recommended to discontinue operating the welder, and
immediately disconnect the main power until proper repairs have been made. Damage to the main
welding transformer can occur if the main power is not disconnected. The damage caused by an open
firing is not limited to the SCR contactor and is not covered by the warranty, nor is any damage which
might be caused to the welding electrodes or to the part which is being welded. While it is not generally
dangerous to the operator, you can be injured by material expelled by an open firing. Safety glasses and a
welding apron are highly recommended for safe operation of any resistance welder. Please observe all rec-
ommended safety precautions included in this manual and your company safety procedures. H&H Resistance
Welders will not be held responsible for any damaged caused by careless operations of this equipment.