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PDF K8AB-PH Data sheet ( Hoja de datos )
| Número de pieza | K8AB-PH | |
| Descripción | Phase-sequence Phase-loss Relay | |
| Fabricantes | Omron | |
| Logotipo |  |
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Phase-sequence Phase-loss Relay
K8AB-PH
Three-phase Phase-sequence Phase-loss
Relay Using Voltage Detection Method
• Prevents reverse motor rotation due to incorrect wiring.
• Distinguishes between positive phases, reversed phases, and
phase loss when power is turned ON.
• Voltage detection method enables application for any load
current.
• One SPDT output relay, 6 A at 250 VAC (resistive load).
• Output status can be monitored using LED indicator.
Refer to Safety Precautions for the K8AB
Series. Refer to page 5 for the Q&A section.
CSM_K8AB-PH_DS_E_2_1
Model Number Structure
■ Model Number Legend
K8AB-@@
1 23
1. Basic Model
K8AB: Measuring and Monitoring Relays
2. Functions
PH: Phase-sequence Phase-loss Relay
3. Rated Input Voltage
1: 200 to 500 VAC
Ordering Information
■ List of Models
Phase-sequence Phase-loss Relay
Functions
Phase sequence and phase loss
monitoring
Rated input voltage (See note.)
Model
200 to 500 VAC
K8AB-PH1
Note: The power supply is shared with the rated input voltage.
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1
1 page  
Questions and Answers
Q Checking Operation
Phase Sequence
Switch the wiring, as shown by the dotted lines in the
connection diagram, to reverse the phase sequence and
check that the K8AB operates.
Phase Loss
Create a phase loss for any input phase and check that the
K8AB operates.
Connection Diagram
3φ,
200 VAC
L1
L2
L3
L1
L2
L3
Q Can phase loss be detected on the load side?
In principle, phase loss cannot be detected on the load side
because the K8AB-PH1 measures three-phase voltage to
determine phase loss.
K8AB-PH
Q Motor Load Phase Loss during Operation
Motor load phase loss cannot be detected during operation.
It can be used to detect phase loss at startup.
Normally, three-phase motors will continue to rotate even if
one phase is open. The three-phase voltage will be induced
at the motor terminals. The diagram shows voltage induction
at the motor terminals when phase R has been lost with a
load applied to a three-phase motor. The horizontal axis
shows the motor load as a percentage of the rated load, and
the vertical axis shows voltage as a percentage of the rated
voltage. The lines in the graph show the voltage induced at
the motor terminals for each load when phase loss occurs
during operation. As the graph shows, voltage is induced at
the motor terminals even if there is phase loss for a motor
load, so the K8AB-PH1 cannot detect phase loss for motor
loads during operation. Use the K8AB-PH1 to detect phase
loss at startup.
Characteristic Curve Diagram
Note: This characteristic curve shows the approximate
values only.
100
95
90 VST
85
80 VTR
75
70
65
60
55
50
45 VRS
0 10 20 30 40 50 60 70 80 90 100 110
Motor load (as a percentage of rated load)
Note: For phase loss of phase R. VST, VTR, and VRS indicate the motor
terminal voltage at phase loss.
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ALL DIMENSIONS SHOWN ARE IN MILLIMETERS.
To convert millimeters into inches, multiply by 0.03937. To convert grams into ounces, multiply by 0.03527.
In the interest of product improvement, specifications are subject to change without notice.
5
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet K8AB-PH.PDF ] | |
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