Common Settings; Identify Voltage And Current Of Actuator And Select Special Ct - Omron K7DD User Manual

2 Procedures

Common Settings

This section describes common settings for configurations using the K7DD unit only and using K7DD
Support Tool.

(1) Identify Voltage and Current of Actuator and Select Special CT

Check the electrical wiring of the actuator to be monitored.
Check it beforehand since the information is necessary for the parameter settings on the K7DD.
The K7DD can monitor the following three types of electrical wiring states.
•
3P3W2M: 3-Phase, 3-Wire, 2-Watt Meter Method
•
3P4W: 3-phase 4-wire
•
Single phase current
Refer to 3-5 Wiring to the Power Lines (P.3-13) for details.
Precautions for Correct Use
Be aware that the K7DD cannot measure the following wiring states:
• 1P2W: Single-phase, 2-wire type
• 3P3W3M: 3-phase, 3-wire 3-watt meter method
Note that the Unit does not support applications where wiring is switched during the course of
operation.
Check the ratings (voltage and current) of the actuator to be
monitored.
Since the following items are necessary in the K7DD parameter settings, check them in advance.
•
Current Input Range
•
Voltage Input Range
Prepare a special CT suitable for the power line to monitor.
1.
Check the rated voltage and current of the monitored
actuator on its nameplate, etc.
2.
Select the smallest special CT of which the rated
current is within the range.
Refer to
special CTs.
2 - 6
A-1-2 Special CTs (P.A-6) for the types of
Power Line Data Generator User's Manual (N233)