Omron K8AK-AW Series, Manual

K8AK-AW

6

Timing Charts

●

Overcurrent and Undercurrent Operation 

Diagram

DIP switch settings: SW3 ON and SW4 ON, or SW3 OFF and SW4 

OFF

●

Overcurrent and Overcurrent Operation 

Diagram (Overcurrent Pre-alarm Mode)

DIP switch settings: SW3 ON and SW4 OFF.

●

Undercurrent and Undercurrent Operation 

Diagram (Undercurrent Pre-alarm Mode)

DIP switch settings: SW3 OFF and SW4 ON.

Input

Note 1. The K8AK-AW

@

 output contacts are normally operative.

Note 2. The startup lock prevents unnecessary alarms from being generated during the 

unstable period when the power is first turned ON. There is no contact output 
during timer operation.

t

Flashing

Lit

Flashing

Lit

Hysteresis: Fixed at 5%

Hysteresis: Fixed at 5%

AL1 alarm indicator

AL2 alarm indicator

Overcurrent (AL1) 

contacts (11-14)

Undercurrent (AL2) 

contacts (21-24)

Overcurrent 

set value (AL1)

Undercurrent 

set value (AL2)

Power 

supply voltage

t: Operating time (0.1 to 30 s)

LOCK

LOCK: 
Startup lock time 
(0 to 30 s)

t

t: Operating time (0.1 to 30 s)

Delay: 250 ms
 (reference value)

Delay: 250 ms 
(reference value)

Note 1. The K8AK-AW

@

 output contacts are normally operative.

Note 2. The startup lock prevents unnecessary alarms from being generated during the 

unstable period when the power is first turned ON. There is no contact output during 
timer operation.

Flashing

Lit

Flashing

Lit

Hysteresis: Fixed at 5%

Hysteresis: Fixed at 5%

AL1 alarm indicator

AL2 alarm indicator

Overcurrent (AL1) 

contacts (11-14)

Overcurrent 

set value (AL2)

Overcurrent (AL2) 

contacts (21-24)

Overcurrent 

set value (AL1)

Input

Power 

supply voltage

LOCK: 
Startup lock time 
(0 to 30 s)

LOCK

t: Operating time (0.1 to 30 s)

t

t: Operating time (0.1 to 30 s)

t

Delay: 250 ms 
(reference value)

Delay: 250 ms 
(reference value)

Note 1. The K8AK-AW

@

 output contacts are normally operative.

Note 2. The startup lock prevents unnecessary alarms from being generated 

during the unstable period when the power is first turned ON. There is no 
contact output during timer operation.

Lit

Flashing

Lit

Hysteresis: Fixed at 5%

Hysteresis: Fixed at 5%

AL1 alarm indicator

AL2 alarm indicator

Undercurrent (AL1) 

contacts (11-14)

Undercurrent 

set value (AL2)

Input

Undercurrent (AL2) 

contacts (21-24)

Undercurrent 

set value (AL1)

Power 

supply voltage

LOCK: 
Startup lock time 
(0 to 30 s)

LOCK

Flashing

t: Operating time (0.1 to 30 s)

t

t: Operating time (0.1 to 30 s)

t

Delay: 250 ms 
(reference value)

Delay: 250 ms 
(reference value)