YOKOGAWA CW120 - Page 45

5-7
IM CW120-E
Wiring
5
● Check Items and Criteria
Voltage Inputs
V
Hz
V
V
Item
1. Existence of voltage
inputs
2. Frequency detection
3. Voltage phase
sequence
Error Message
(in lower row)
Error message
Error message
Error message
Criteria

• If an input level is 10% or less of the range,
then an error results.
• Else, the frequency detection takes place.
• If the frequency of input V1 exceeds the 40 to
70 Hz range, then an error results.
• Else, the voltage phase sequence check takes
place.
For 1∅2W or 1∅3W:
• This item is not checked.
For 3∅3W:
• If V2 leads V1 by more than approximately 80
degrees or less than approximately 40 degrees,
an error results.
For 3∅4W (only for the CW121):
• If V2 lags behind V1 by more than
approximately 140 degrees or less than
approximately 100 degrees, an error results.
• Or if V3 leads V1 by more than approximately
140 degrees or less than approximately 100
degrees, an error results.
• Else, “Good” is displayed.
Current Inputs
A
A
A
Item
1. Existence of input
currents
2. Clamp directions
Error Message
(in lower row)
Error message
Error message
Criteria

• If an input level is 1% or less of the range, then
an error results.
• Else, the clamp direction check takes place.
• For any wiring method other than 3∅3W, if the
power of one or more phases is negative, an
error results.
• For 3∅3W, if the whole power is negative, an
error results.
• Else, “Good” is displayed.
NOTE
• As the wiring is judged on the above criteria, an error may result even when wiring is correct or
wrong wiring may pass the check.
• When a measured value appears to be abnormal, check the above criteria and wiring again.
5.5 Wiring Check Function