Kikusui PAD-L III Series, Operation Manual

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6-18 Maintenance PAD-L
Symptom 3: Excessive output is produced.
Check item Possible cause and remedy
The shorting bar connecting terminals 3 and 4
of the control terminal board has been
removed or is loose.
• Install the shorting bar properly.
The output voltage (current) does not fall. •
• Defective power transistor
Failed breeder circuit
None of the above • Failed OVP circuit
Symptom 4: Unstable output
Check item Possible cause and remedy
The shorting bar connecting the sensing
terminals has been removed or is loose. • Install the shorting bar properly.
The shorting bar connecting terminals of the
control terminal board has been removed or is
loose.
• Install the shorting bar properly.
Is the input power voltage normal? • Beyond the input voltage range
A special load has been connected. • See 2.3 "Load".
A drift results in problems. • Perform a warm-up for at least 30 minutes.
Oscillating • Phase rotation has occurred due to wiring for remote
sensing. Connect an electrolytic capacitor to the load
ends. See 4.1 "Remote sensing".
None of the above • Circuit failure
Symptom 5: Large ripple voltage
Check item Possible cause and remedy
Is the input power voltage normal? • Input voltage is too low.
The sensing terminals have been floated from
the output terminals. • Firmly connect the sensing terminals.
A strong magnetic field or electric field
generating source is located nearby.
• Affected by electromagnetic induction.
Move the unit and load away from the magnetic field
or electric field generating source.
Twist the load wires together.
None of the above • Circuit failure