K8AB-PA 데이터 시트보기 (PDF) - OMRON Corporation
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K8AB-PA Datasheet PDF : 11 Pages
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Questions and Answers
Q Checking Operation
With the rated input voltage applied, gradually change the
voltage to any one phase. The Unit will operate when the
difference between the maximum and minimum voltage
phases reaches or exceeds the asymmetry operating value.
Asymmetry operating value = Rated input voltage ×
Asymmetry set value (%)
Example: For monitoring mode set to three-phase three-wire
monitoring, a rated voltage of 200 V, and an operating time
of 5 s.
Note: K8AB-PA@ output relays are normally operative.
L1
Inputs L2
L3
Asymmetry operating voltage (set value)
Alarm indicator
Contact
Flashing
Lit
T T: Operating time (0.1 to 30 s)
T1: Startup lock time (1 s or 5 s)
Connection Diagram 1
3φ
200 VAC
L1
L2
L3
L1
V1
L2
V2 V3
0 to 150 V
Three-phase variable
autotransformer
K8AB-PA
Q How to Measure the Operating Time
Asymmetry
Change the input rapidly from a symmetric state to an
asymmetric state and measure the time until the relay
operates.
Operating Time
Adjust the slide resistor so that the voltage difference
applied to the K8AB terminals is equal to or greater than
the asymmetry operating value when the auxiliary relay
operates, as shown in connection diagram 2. Close the
switch and use the cycle counter to measure the operating
time.
Connection Diagram 2
3φ 200 VAC
L1
X X/a
L2
L3
L1
V1
L2
R1
V2 V3
X/b
L3
R2
R1: Slide resistor
200 Ω 200 W
R2: 100 Ω 400 W
± C 200 V
Cycle counter
Q Checking the Phase Sequence and Phase Loss
Operation
Phase Sequence Operation
Switch the wiring, as shown by the dotted lines in
connection diagram 1, to reverse the phase sequence and
check that the K8AB operates.
Phase Loss Operation
Create a phase loss for any input phase and check that the
K8AB operates.
Q Operating Adjustment Knobs
Use a screwdriver to turn the knobs. There is a stopper to
prevent the knob from turning any further once it has been
turned completely to the left or right. Do not force the knob
past these limits.
Q Load-side Phase Loss
In principle, phase loss cannot be detected on the load side
because the K8AB-PA@ measures three-phase voltage to
determine phase loss.
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