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26
I N S T R U C T I O N M A N U A L • M O D E L H 5 2 0 E / H 5 4 0 E
OVERLOAD PROTECTION
There are two overload protection circuits – one for the power supply and
one for the hand gun – which will terminate the welding cycle when the
system is operated under adverse conditions, such as excessive wattage,
voltage or current, or a loose or failed horn/tip. The welding cycle will also be
automatically terminated if the hand gun contacts a grounded surface while
the power is on – the power supply will overload because it detects an
alternate ground path. The overload protection circuits will prevent damage
to internal system components. Depending upon the type of condition that
caused the overload, the situation is resolved by different methods.
If an ultrasonic overload condition exists, simply press the O.L. Reset key to
reset the system.
If a shock protection condition caused the overload, the system cannot be
reset with the O.L. Reset key. The system must be powered down (using the
ON/OFF switch) and the cable/hand gun connection problem(s) fixed, before
turning the power supply back on. (There is a ground fault circuit for shock
protection which monitors currents in the hand gun cable and the earth
ground. If a wire breaks or an alternate ground path is detected - which
changes the currents - the unit will go into a latched “Off” state to protect the
operator.)
If an overload condition persists, contact our Service Department at 1-800-
745-1105.
When the hand gun is
on, be sure to isolate it
from any grounded
surface to avoid
triggering an overload
condition as the
system detects an
alternate ground path.
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