Iwatsu SS-500 Series Instruction Manual page 96

Errors
Overload
Green lights up
Red blinks rapidly
Red lights up or goes out
Orange goes out
One of greens lights up
The input current exceeding the specified level of each
current range is detected.
When you use the 30 A range
 Immediately remove the sensor from the conductor under
measurement.
When you use the 0.5 A range or 5 A range
 Switch a higher current range.
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