Datasheet
K8AK-PM
4
Connections
Terminal Diagram
Note: 1. Do not connect anything to terminals that are shaded in gray.
2. Use the recommended ferrules if you use twisted wires.
Wiring Example
Timing Charts
●Overvoltage/Undervoltage and Phase
Sequence/Phase Loss Operation Diagram
Operation Indicators
*1 Over_Ry turns OFF when phase loss is detected.
*2 L1 and L2 are also used for the power supply. If the voltage becomes very
low, the indicator will turn OFF.
*3 The indicator will flash once per second after an incorrect phase is detected
and once per 0.5 second during the detection time.
L1
L2
L3
11 12
Control Output
Relay Output
250 VAC, 5 A (resistive load)
3-phase,
3-wire
power
supply
30 VDC, 5 A (resistive load)
14
Relay Output
Input Voltages
Monitoring 3-phase,
3-wire Power Supply
Monitoring 3-phase,
4-wire Power Supply
or
3-phase,
4-wire
power
supply
21
24
22
Relay Output
N
_
_
Overvoltage
L1
L2
L3
__N
L1
L2
L3
__N
Undervoltage, phase
sequence or phase loss
11 12 14
21 24 22
3-phase
voltage
21 22
L1 L2 L3
11 12
14
N_
_
L1
L2
L3
N
24
Motor
Power supply
AC/DC
Input
Undervoltage alarm indicator
Undervoltage relay 21-24
L2
L1
L3
L2
L3
L2
L1
L1
L2
L3
t
t1
t
L1
L2
L3
L1
L3
L2
L1
L3
FlashingFlashingFlashing
Flashing
Lit
Overvoltage alarm indicator
Undervoltage set value
Overvoltage
set value
Undervoltage alarm indicator
Overvoltage relay 11-14
Undervoltage relay 21-24
Input
Hysteresis: Fixed at 5%
Hysteresis: Fixed at 5%
t: Operating time (0.1 to 30 s)
t1: Power ON lock (1 s or 5 s)
Phase loss operation
Phase sequence operation
Flashing
t: Operating time (0.1 to 30 s)
Lit
Note: 1. The K8AK-PM@ 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.
3. Phase loss is detected by L1, L2, and L3 voltage drops.
A phase loss will exist if any of the phases drops below 60%
of the rated input.
Item Display Contact
operation
Ry
indicator
Over
indicator
Under
indicator
Over
relay
Under
relay
Overvoltage ON ON OFF OFF ON
Undervoltage ON OFF ON ON OFF
Phase loss OFF
OFF*
1
ON*
2
OFF *
1
OFF
Phase
se-
quence
Incor-
rect
phase
ON OFF
Flashing*
3
ON OFF
Cor-
rect
phase
ON OFF OFF ON ON