K8AB-AS

8

2. Hysteresis

Hysteresis is set using the hysteresis knob (HYS.)

The setting range is 5 to 50% of the operating value.

Turn the knob while there is an input to the input terminals until the alarm indicator flashes (when the set value and the input have reached the

same level.)

Use this as a guide to set the hysteresis.

Example: Maximum of 200 A AC, Current Setting (SV) of 50%, and Overcurrent Operation

Operation will be at 100 A and resetting at 90 A when the hysteresis (HYS.) is set to 10%.

3. Operating Time

The operating time is set using the operating time knob (T).

The operating time can be set to between 0.1 and 30 s.

Turn the knob while there is an input to the input terminals until the alarm indicator flashes (when the set value and the input have reached the

same level.)

Use this as a guide to set the operating time.

If the input current exceeds (drops lower than) the current setting, the alarm indicator will start flashing for the set period and then stay lit.

4. Startup Lock Time

The startup lock time is set using the startup lock time knob (LOCK).

The startup lock time can be set to between 0 and 30 s.

Turn the knob while there is an input to the input terminals until the alarm indicator flashes

(when the set value and the input have reached the same level.)

Use this as a guide to set the startup lock time.

The startup lock time will start when the input current reaches 30% or more of the current

setting.

Use startup lock time to prevent unwanted operation, e.g., as a result of inrush current.

Dimensions

(Unit: mm)

Single-phase Current Relays

OMRON CT

Inrush current

Current setting

30% of current setting

Startup lock timer start

Startup lock time

There are no outputs

during this period.

22.5

100

72

90

5

5

K8AB-AS1

K8AB-AS2

K8AB-AS3

1.8

76

4.1

10

10

5.9

5.2

20

Two M5 screw holes or

two 5.5-dia. holes

57

30 dia.

14.5

14.5

6

8.5

50

33.5

34.5

81.5

13.5

86

54

63

11

4.7

Four M4

× 6 screws

17

20

9.3

1.7

1.7

9.3

76

Mounting Hole Dimensions

Note: The OMRON Current Transformer (CT) is

designed to be used with the K8AB-AS3.

Use terminals k and l for connections.

(Terminals kt and lt are not used.)

K8AC-CT200L