NF EC1000SA, Instruction Manual

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5.3 SET Menu
EC1000SA 5-20
Note with caution that the peak current limiter may allow overshooting, depending on the load, and
therefore may not achieve the peak current value as set.
For an inductive load, operation of the limiter can cause an output overvoltage, triggering the
protection function. In this case, the peak current limiter settings (both positive and negative) should
be reduced.
In the case that the output current flows suddenly by the output short circuit or the frequency is high,
if the response speed of the current limiter is not enough to limit the output current, the output
overcurrent protection may work in this case and then output is turned off.
5.3.8 RMS current limiter settings
This limits the output RMS current.
When the output RMS current exceeds this setting, the output voltage is suppressed.
Table5-17. RMS Current Limiter Setting Range
Setting Setting Range Resolution Initial Value
RMS current
limiter
100 V range 1.0 A to 10.5 A 0.1 A 10.5 A
200 V range 1.0 A to 5.3 A 0.1 A 5.3 A
Operation steps
Select in the SET menu and set numerical values.
See “3.4.7 Using limiter functions” , for description of the output average value current
limiter.
It will take time after the output current exceeds a limiter until the output current is restricted
enough, because the RMS current limiter needs to calculate effective value. The length of the time
until limiting output current changes depending on the conditions of the output voltage setting, load,
and limiter setting.
ex1
：
Output voltage 20 V, resistance load 10
Ω
, RMS current limiter setting 1.5 A
approx 10 s (reference value)
ex2
：
Output voltage 100 V, resistance load 10
Ω
, RMS current limiter setting 1.5 A
approx 0.5 s (reference value)
In the case that the output current flows suddenly by the output short circuit or the frequency is
high, if the response speed of the current limiter is not enough to limit the output current, the output
overcurrent protection may work in this case and then output is turned off.
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CAUTION
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CAUTION
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CAUTION