4-81
Chapter 4. Functions
For models with CT (current transformer) input, current can be measured by the CT input.
z
Number of turns and number of power wire loops
The setting is valid if the AO-C block or V-P block is in slot A2, B2, A1, or B1.
Settings can be adjusted to match the CT input transformer.
Item (bank)
Display
Description
Initial value
Number of turns
(CT bank)
MENU > CT
Number of turns
100 to 4000
800
Number of power wire loops
(CT bank)
MENU > CT
Number of wire loops
1 to 6
1
•
For the number of turns, set the number of turns of the CT connected to the
model C7G.
•
For the number of power wire loops, set the number of times that the electric
wire passes through the hole in the CT. For example, if the electric wire passes
through the hole of the CT twice as shown below, set "2."
To heater, etc.
←
CT
CT input
This controller
Power wire
→
To relay or
power supply, etc.
•
The CT input can be displayed on the monitor screen of the loop number
that was set to "Input value display loop definition (CT/VT input display loop
definition)" in the basic action bank.
Handling Precautions
•
If the AO-C block is used, heater burnout, overcurrent, and short circuit cannot
be detected.
•
Make sure that the current does not exceed the upper limit of the displayed
range of the CT input. Exceeding the upper limit could cause malfunction.
•
If the unit detects an overcurrent exceeding the upper limit of the displayed
range of the CT input, a CT input error alarm will be generated. However, if the
current is too large and the malfunction occurs, the CT input error alarm will
not be generated.
•
The CT input can be displayed on the monitor screen of the loop number
that was set for "Input value display loop definition (CT/VT input display loop
definition)" in the basic action bank.
4 - 14 CT (Current Transformer) Input
