Wiring Example; Timing Charts - Omron K8DT-PM Manual

Connections
Terminal Diagram
K8DT-PM1 C N
(1) (2)
(1) Input Voltages
PM1 PM2
Phase-to-phase voltage:
200 to 240 VAC
3-phase, 3-phase,
3 W 3 W
power power
supply supply
L1 L2
L3
Note: Do not connect anything to terminals that are shaded in gray.

Wiring Example

Relay Output
L1
3-phase
L2
voltage
L3
L1 L2
L3
DIP SW
12
14 11

Timing Charts

Overvoltage/Undervoltage and Phase Sequence/Phase Loss Operation Diagram
Power supply
voltage
L1
Input L2
L3
Undervoltage
set value
Delay time: 250 ms
(reference value)
OVER_LED
Flashing
UNDR_LED
Lit
Contacts 11-14 or
transistor output
t: Operating time (0.1 to 30 s)
t
t1: Power ON lock (1 s)
t1
Phase Loss Operation
L1
Input L2
L3
Flashing
OVER_LED
Flashing
UNDR_LED
Contacts 11-14 or
transistor output
L1
Phase-to-phase voltage:
380 to 480 VAC
L1 L2
DIP SW
L3
14
Motor
Power
supply
AC/DC
Hysteresis:
Fixed at 5%
Hysteresis: Fixed at 5%
Delay time: 250 ms
Flashing
(reference value)
Lit
t t: Operating time (0.1 to 30 s)
Phase sequence Operation
L2 L1 L3 L1
L1 L3 L2 L2
L3 L2 L1 L3
Flashing Flashing
Flashing
L2
L3
(2) Output
C: Relay Output T: Transistor Output
12 12
14 11
11
Inside
Transistor Output
L1
3-phase
L2
voltage
L3
Note: Use copper wires with a rating of 75°C or an equivalent rating.
Note: 1. The K8DT-PM@ output contacts are normally operative.
2. The 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. Phase loss is detected by a drop in the L1, L2, or L3 voltage.
A phase loss is detected when any of the phase-to-phase
voltages goes below 60% of the rated input.
4. L1 and L2 are also used for the power supply. If the voltage
becomes very low, the Relay will not operate.
5. Phase loss (on power supply side and load side) is not
detected in the motor load during operation.
Operation Table
Item
OUT_LED
Normal
ON
Overvoltage
OFF
Undervoltage
OFF
Phase Loss OFF
Phase sequence OFF
*1. L1 and L2 are also used for the power supply. If the voltage
becomes very low, the indicator will turn OFF.
*2. The indicator will flash once per second after an incorrect phase
is detected and once per 0.5 second during the detection time.
K8DT-PM
14 11
Inside
L1 L2
L3
DIP SW
14 11
PLC
Indicators
OVER_LED UNDR_LED
OFF OFF
ON OFF
OFF ON
Flashing *1 Flashing *1
OFF Flashing *2
Motor
Power
supply
AC/DC
Contact
operation
ON
OFF
OFF
OFF
OFF
3