Omron K8AK-PH1 200/500VAC Manual page 8

K8AK-AW
●Undercurrent and Undercurrent Operation Diagram (Undercurrent/Undercurrent Monitoring Mode)
(When Using as an Undercurrent Pre-alarm)
DIP switch settings: SW3 OFF and SW4 ON
K8AK power supply voltage
Undercurrent set value (AL1)
Undercurrent set value (AL2)
0 A
Flashing
AL1 alarm indicator
Flashing
AL2 alarm indicator
Undercurrent (AL1)
contacts (11-14)
Undercurrent (AL2)
contacts (21-24)
Power ON lock (approx. 1 s)
Operating time
(0.1 to 30 s)
□
Note: 1. The K8AK-AW output contacts are normally operative.
2. Power ON 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.
3. There is no startup lock time function for monitoring undercurrent.
Nomenclature
Front
Terminal block
(See notes 1 and 2.)
Power indicator
Relay status indicator
Alarm indicator
Alarm indicator
Terminal block
(See notes 1 and 2.)
8
Flashing
Flashing
Delay: 250 ms
(reference value)
Delay: 250 ms
(reference value)
t
Current knob (AL1)
Current knob (AL2)
Operating time knob (T)
Startup lock time knob
(LOCK)
Lit
Lit
Delay: 250 ms
(reference value)
Delay: 250 ms
(reference value)
t: Operating time (0.1 to 30 s)
t
t: Operating time (0.1 to 30 s)
●Indicators
Item
Power indicator (PWR: Green) Lit when power is being supplied.
Relay status indicator
(RY: Yellow)
Alarm indicator
(ALM: Red)
●Setting Knobs
Item
Current knob (AL1)
Current knob (AL2)
Operating time knob (T)
Startup lock time knob
(LOCK)
Note: 1. Use either a solid wire of 2.5 mm
maximum or a ferrule with insulating
sleeve for the terminal connection.
The length of the exposed current-
carrying part inserted into the terminal
must be 8 mm or less to maintain
dielectric strength after connection.
<Recommended ferrules>
Phoenix Contact
 Al 1,5-8BK (for AWG16)
 Al 1-8RD (for AWG18)
 Al 0,75-8GY (for AWG18)
2. Tightening torque: 0.49 to 0.59 N·m
Hysteresis: Fixed at 5%
Hysteresis: Fixed at 5%
Meaning
Lit when relay is operating.
Lit when there is an overcurrent or un-
dercurrent.
The indicator flashes to indicate the er-
ror status after the input has exceeded
the set value while the operating time is
being clocked.
Usage
Used to set the current to 10% to 100%
of maximum setting range.
Used to set the current to 10% to 100%
of maximum setting range.
Used to set the operating time to 0.1 to 30 s.
Used to set the startup lock time to 0 to 30 s.
Use for the purpose of preventing unwant-
ed operation, e.g., as a result of inrush cur-
rent during load startup. There will be no
alarm output when the startup lock timer is
operating.
2
For 2.5 mm
smaller solid wires
8 mm max.
For ferrules with
an insulation sleeve.
2
or
8 mm max.