YOKOGAWA CW140, User Manual, Page: 57 / 292

7-5
IM CW140-E
Common Functions of All Modes
7
7.2 Checking Wiring
●
Check Item
The table below shows check items and error conditions.
If one ore more check results are NG, the corresponding error messages
appear.
Item Error condition Error message
1. Voltage input
2. Current input
3. Voltage phase sequence
4. Clamp direction erro
5. Frequency source
10% or less of range
1% or less of range
• The result of checking item 1
"Voltage input" is NG.
• For three-phase three-wire line:
V3 leads V1 by more than
approximately 80 ° or less than
approximately 40 ° .
• For three-phase four-wire line:
V2 lags behind V1 by more than
approximately 140 ° or less than
approximately 100 ° , or V3 leads
V1 by approximately more than
140 ° or less than approximately
100 ° .
• The active power is 0.17% or less
of the rated voltage.
• Power for one or more phases is
negative (The power for the whole
three-phase three-wire line is
negative). This does not apply
when regenerative energy is used.
• Frequency measurement is
unstable.
• Input frequency is 40 Hz or less, or
1.2 kHz or more.
No voltage input. Check VOLTAGE
CLIP connection.
No current input. Check CURRENT
CLAMP connection.
Possibility of wrong voltage wiring.
Check VOLTAGE CLIP wiring.
Polarity of CURRENT CLAMP is
inverse. Check the direction of
CURRENT CLAMP.
Frequency source is not stable.
Select a stable frequency source.
NOTE
As the CW140 judges wiring according to the conditions listed above, there may be some cases
where the check result of correct wiring is NG, and vice versa. If measurement values appear
erroneous, check these conditions and re-check the wiring.