5-9
Chapter 5 CONNECTING A LOAD
For loads having a capacitor-input-type rectifier circuit
When electronic devices having a capacitor-input-type rectifying circuit are used as loads for
this equipment, a peak current a few times greater than the output current rms flows near the peak
output voltage as the output current.
In this case, the maximum output peak current must not exceed four times of the maximum rated
current (rated output capacity [VA]/100 [V] (for 100 V range) or rated output capacity [VA]/
200 [V] (for 200 V range)).
Also, the output current rms should not exceed the rated output current value calculated when
the load power-factor is 1 in the case of the liner load noted above.
If the equipment is used at a current exceeding the rated output current (peak or rms) noted
above, the equipment’s protective function is activated, which may distort the output voltage
waveform or cut off the output. For further information on the protective functions, see Chapter
9, PROTECTIVE FUNCTIONS AND THEIR OPERATIONS.
However, the output voltage (set value) must be a constant voltage to supply the maximum peak
current without distortion. It may distort the voltage waveform and current waveform to
suddenly change (raise) the output voltage set value. In optional power line abnormality
simulation and sequence operation, a change of output voltage may distort the waveform
similarly. If the output voltage set value is a constant value in OUTPUT ON, the equipment can
supply the maximum peak current without distortion.
For loads which draw a rush current
For loads noted below, a rush current (several to several tens of times greater than the normal
current) may flow during several to several tens of cycles of output frequency when voltage is
applied to such a load or when voltage changes suddenly.
• Transformers and slide transformers
When voltage is applied to a transformer or slide transformer, a rush current of the maximum
several tens to hundreds of times greater than the normal current may flow during several
cycles depending on voltage application timing or the state of residual magnetism.
• Motors and lamps loads
When voltage is applied to a motor or lamp loads, a rush current several to several tens of
times greater than the normal current may flow during several tens to hundreds of cycles.
• For capacitor-input-type rectifying loads
For electronic devices with a capacitor-input-type rectifying circuit in an power input block,
if a protective (limiting) circuit against rush current is not provided, a rush current several tens
to hundreds of times greater than the normal current may flow during several cycles.
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