K8AC-CT200L Omron, K8AC-CT200L Datasheet - Page 10

• Manufacturer Part Number: K8AC-CT200L
• Description: 20-200A Current Transformer
• Manufacturer: Omron

Specifications of K8AC-CT200L

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Example: Overcurrent Operating Mode, Normally Open Relay Drive,
Connection Diagram
10
100 VAC
100 VAC
Q
Q
Q
Alarm indicator
Checking Operation
Overcurrents
Undercurrent
How to Measure the Operating Time
Overcurrent
Undercurrent
Monitoring Switch-mode Power Supplies
Switch-mode Power Supplies cannot be monitored. In
circuits with a capacitor input, including switch-mode power
supplies, the input capacitor recharge current flows in pulse
form as the load current. The K8AB-AS@ has a built-in filter
as a countermeasure against high frequencies and cannot
be used to remove pulse current.
Current input
Relay output
Variable autotransformer
Gradually increase the input from 80% of the setting.
The input will equal the operating value when the input
exceeds the setting and the alarm indicator starts flashing.
Operation can be checked by the relay outputs that will
start after the operating time has passed.
Gradually decrease the input from 120% of the setting and
check the operation using the same method as for
overcurrent.
and an Operating Time of 5 s
Change the input suddenly from 0% to 120% of the set
value and measure the time until the Unit operates.
Change the input suddenly from 120% to 0% of the set
value and measure the time until the Unit operates.
Set value
Questions and Answers
Single-phase Current Relay
400 W (two in parallel)
Cycle counter
±
30 Ω
C 100 V
0 to 10 A
A
Flashing
5 s
Input terminals
supply
Power
K8AB-AS
Lit
A1
A2
Output
Input signal
Input ground
Q
Q
Q
Q
Grounding the Power Supply for K8AB Models with a DC
Power Supply
The input and power supply must be isolated.
Models with a DC power supply have a non-isolated power
supply. The input and power supply are connected internally
so the K8AB-AS@ will not operate normally if an unwanted
current path exists. If an unwanted current path exists, use a
K8AB model with an AC power supply or use an isolated DC
power supply.
Using Multiple K8AB Relays with a DC Power Supply
The input and power supply must be isolated.
The input and power supply are connected internally so an
unwanted current path will be created if more than one K8AB
is used with one DC power supply, as shown in the diagram,
and the K8AB will not operate correctly. If an unwanted
current path exists, use a K8AB model with an AC power
supply or use a different isolated DC power supply for each
K8AB.
Operating Adjustment Knobs
Use a screwdriver to turn the knobs. There is a stopper to
Can motor loads be monitored by combining the K8AB-
AS2-J with a commercial CT?
If the starting current exceeds the overload capacity of the
K8AB-AS2-J, it may cause a malfunction to occur in the
K8AB-AS2-J. When monitoring a device that has a large
starting current such as a motor, use the K8AB-AS3-J.
Adjust the number of conductor windings so that a minimum
of 10 A flows to the primary side of the K8AC-CT200L CT.
Increasing the number of windings will simulate an increase
in current. Minimize the operating time (0.1 s) for this
application.
prevent the knob from turning any further once it has been
turned completely to the left or right. Do not force the knob
past these limits.
To the K8AB-AS3
K8AB
K8AC-CT200L
K8AB
Primary side conductor
Cat. No. N142-E1-02
24 VDC
power supply