K8AB-PA 데이터 시트보기 (PDF) - OMRON Corporation

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K8AB-PA

Three-phase Asymmetry and Phase-sequence Phase-loss Relay

OMRON Corporation 

Connections

K8AB-PA

■ Wiring Diagram

Voltage Asymmetry and Phase Sequence/Phase Loss Operation Diagram

L1

Input L2

L3

Asymmetry operation voltage (set value)

Alarm indicator

Flashing

Lit

Relay

L1

Input L2

L3

Alarm indicator

T T: Operating time (0.1 to 30 s)

T1: Power ON lock (1 s or 5 s)

T1

Phase loss operation

Phase sequence operation

L1 L3 L1

L3 L2 L2

L2 L1 L3

Flashing Flashing

Relay

Note: 1. K8AB-PA 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.

4. L1 and L2 function both as the power supply terminals and as input terminals.

If the voltage drops dramatically, then the Relay will not operate due to an

undervoltage.

5. Motor load phase loss cannot be detected during operation.

6. Phase loss is detected based on voltage, so phase loss cannot be detected on

the load side.

Calculating the Asymmetry Operating Voltage

Asymmetry operation condition = (Highest voltage − Lowest voltage) > Asymmetry operating voltage

Asymmetry operating voltage = Rated input voltage (V) × Asymmetry set value (%)

Note: The rated input voltage is selected and set with the DIP switch.

N L1 L2 L3

Voltage input

L1

L2

N

L3

14

Signal output

11

12 Relay signal

output

Load

Operation Indicators

Item

Display

Contact

operation

Ry_LED Alarm_LED Alarm_LED

Asymmetry OFF

ON

OFF

Phase loss OFF

ON

OFF

Reversed OFF

phase

Flashing OFF

(See note.)

Correct

ON

phase

OFF

ON

Note: The indicator will flash once per second after a phase loss is

detected and once per 0.5 second during the detection time.

5

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