Using Rms Current Limiter - NF DP060LM Instruction Manual

4. Advanced Operation
4.1.2

Using RMS Current Limiter

Effective value of output current is limited by the RMS current limiter. While the limiter is working,
icon is displayed and LIMIT LED illuminates.
Setting values of RMS current limiter are variable, and kept independently for each of 100 V and
200 V ranges.
You can choose whether to make the output off or not upon the triggering of the RMS current limiter.
If you choose to set the output off, specify the continuous operation time of limiter until the output
off becomes effective. Whether output off is set or not and the time setting are common regardless of
the output ranges.
For the default setting range, see 11.14.
-------- Notes ------------------------------------------------------------------------------------------------------------
 It will take time from the limiter starts operation until the output current is restricted enough,
because the RMS current limiter needs to calculate effective value. Use the peak current
limiter to limit the current quickly. For peak current limiter, see 4.1.1.
 RMS current limiter may not be able to limit output current sufficiently if the load impedance
is very small (e.g. output short circuit). Also, RMS current protection may work in this case
and then output is turned off.
 When the number of units is increased or decreased based on the power unit energization
setting, the setting values of the RMS current limiter are reset to the scaled factory default
setting in proportion to the number ratio of energized power units. Refer to 11.14 for details.
 In the polyphase output, the setting of the RMS current limiter is common to all phases.
 If the output off after the continuous operation of the limiter for the specified duration is
enabled, the setting of output-off phase is ignored.
 In the polyphase output, neutral line current is not limited.
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CAUTION
 For loads with very low impedance (e.g. output short circuit, etc.), the RMS current limiter
cannot sufficiently limit the output current and may exceed the rated current. Use within the
rated current range by checking the current measured value and using the peak current limiter
together etc.
66 PROGRAMMABLE AC POWER SOURCE