Cat. No. N144-E1-02
Single-phase Voltage Relay
K8AB-VW
5
Connections
■
Wiring Diagram
Overvoltage and Undervoltage
Operation Diagram
DIP switch settings: SW3 and SW4 both ON or both OFF.
Note: 1.
The K8AB-VW output relay is normally operative.
2.
The power ON lock prevents unnecessary alarms from
being generated during the instable period when the power
is first turned on. There is no relay output during timer
operation.
Overvoltage and Overvoltage
Operation Diagram (Overvoltage Pre-
alarm Mode)
DIP switch settings: SW3 ON and SW4 OFF.
Note: 1.
The K8AB-VW output relay is normally operative.
2.
The power ON lock prevents unnecessary alarms from
being generated during the instable period when the power
is first turned on. There is no relay output during timer
operation.
Undervoltage and Undervoltage
Operation Diagram (Undervoltage Pre-
alarm Mode)
DIP switch settings: SW3 OFF and SW4 ON.
Note: 1.
The K8AB-VW output relay is normally operative.
2.
The power ON lock prevents unnecessary alarms from
being generated during the instable period when the power
is first turned on. There is no relay output during timer
operation.
Note:
The 24-VDC power supply type is a non-insulated power
supply.
The inputs and power supply are connected internally, so a
malfunction may occur due to an unwanted current path if the
inputs and power supply are connected to the same line.
T
T1
T
AL1 alarm indicator
Overvoltage (AL1) relay
Input
Undervoltage (AL2) relay
Overvoltage setting (AL1)
Undervoltage set value (AL2)
Hysteresis: Fixed at 5%
Flashing
Lit
Flashing
Lit
Hysteresis: Fixed at 5%
Power supply voltage
T: Operating time (0.1 to 30 s)
T1: Power ON lock (1 s or 5 s)
AL2 alarm indicator
T: Operating time (0.1 to 30 s)
T1
AL1 alarm indicator
Overvoltage (AL1) relay
Input
Overvoltage (AL2) relay
Overvoltage setting (AL1)
Hysteresis: Fixed at 5%
Lit
Flashing
Hysteresis: Fixed at 5%
Power supply voltage
T1: Power ON lock (1 s or 5 s)
AL2 alarm indicator
Overvoltage setting (AL2)
Flashing
Lit
T1
AL1 alarm indicator
Input
Undervoltage (AL2) relay
Undervoltage set value (AL2)
Hysteresis: Fixed at 5%
Flashing
Lit
Hysteresis: Fixed at 5%
Power supply voltage
T1: Power ON lock (1 s or 5 s)
AL2 alarm indicator
Undervoltage set value (AL1)
Undervoltage (AL1) relay
Flashing
Lit
Load
Power supply
voltage
Voltage input
Signal output
Signal output
14
24
12
22
A1
A2
V1
V2
V3
11
21
AL1 relay
signal
output
AL2 relay
signal
output
COM
Single-phase power
