2-6
IM CW240E
2.5 Overrange/Error Indication
during Measurement
● Overrange Indication during Measurement
: Conditions for voltage overrange indication
This mark appears if the peak value of an input signal exceeds 300%
(180% for a 1000 V range) of the rated voltage range or if the rms value of
measured voltage exceeds 110% of the rated range.
: Conditions for current overrange indication
This mark appears if the peak value of an input signal exceeds 400% of the
rated current range or if the rms value of measured current exceeds 110%
of the rated range.
TIP
• Voltage overrange mark appears if an input signal to one of terminals U1 to U3
satisfied the noted conditions.
• Current overrange mark appears if an input signal to one of terminals CH1 to
CH4 satisfies the noted conditions.
Indication of "OR" or "----" symbol
The CW240 indicates "OR" or "----" symbol instead of a usual four-digit value if
the measured value meets the noted conditions.
WARNING
The CW240 shows an overrange mark in the maximum range only if the input
level exceeds the maximum allowable level. Do not apply any input level higher
than the maximum allowable level.
CAUTION
To measure an input signal level exceeding the rated range, use a voltage trans-
former (VT) or current transformer (CT).
When using a VT or CT, carefully read section 4.5, Wiring the Measurement
Circuit Using External VT/CT.
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