7-23
IM CW120-E
Making Settings
7
NOTE
• The VT ratio cannot be changed when the electric energy count or the elapsed time of integra-
tion is not zero. Attempting to change the ratio causes to appear on the screen (this
will disappear and the measurement screen will return when any key is pressed). Clear the
electric energy count first. For details of how to do this, see Section 9.2.3, “Clearing Electric
Energy Count,” or Section 7.2.4, “Clearing Electric Energy Count and Resetting System,” in
this chapter.
•A setting that causes the product of [VT ratio
××
××
× CT ratio
××
××
× rated power
××
××
× 1.3] to exceed 9999 GW
is not allowed.
TIP
Example of VT ratio setting:
When using a 2200-to-110 V transformer, the transformer ratio is 20:1. So, set the VT ratio to 20.
Displayed values:
Range of voltage reading: Voltage range × VT ratio
Range of current reading: Current range × CT ratio
Range of power reading: Rated power × VT ratio × CT ratio
7.2 Setting Each Item
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