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US-501 operation manual
US-501 R02 13.07.09 Display version 4, PLC version 4
P.32 of 31
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Trouble Shooting
Problem
cause
Solution
No power in some places
Power cable or plug faulty
Check the power supply connection
Circuit breaker tripped
Reset circuit breaker and investigate the cause
Main power switch not turned on
Press the power ON button (start)
Bad connection
Check all wires for loose connection
Faulty transformer
Check the voltage of switching power supply
Fabric not feeding
Press foot is in the UP position
Press and release the knee switch to lower the
press foot
Sonics status is not in READY mode
Turn OFF the power and then ON to reset
Sonics is turned off
Press the sonic enable button to ON
Weld strength is poor
Sonics power is too low
Increase power slightly and try
Improper cutting bit used
Refer to H&H for proper cutter bit for
particular fabric
Feed step is too large
Decrease feed pitch of the sewing machine
Stamp pressure is too low
Increase the stamp force slightly at a time
Sonic overload
Horn is cracked
Replace horn
Screw in horn is broken
Replace with a new screw
Faulty ultrasonic power supply
Inspect by an authorized personnel
High pitch noise is heard
Horn touching neighboring component
Re-adjust position to isolated horn
Ultrasonic mounting loose
Re-tighten all screws