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零件编号 | K8AB-PM | ||
描述 | Three-phase Phase-sequence Phase-loss Relay | ||
制造商 | Omron | ||
LOGO | |||
1 Page
Three-phase Phase-sequence Phase-loss Relay
K8AB-PM
Ideal for monitoring 3-phase power supplies
for industrial facilities and equipment.
• Monitor overvoltages, undervoltages, phase sequence, and
phase loss for three-phase 3-wire or 4-wire power supplies with
just one Unit.
Switch setting for 3-phase 3-wire or 3-phase 4-wire power
supply.
• Two SPDT output relays, 6 A at 250 VAC (resistive load).
Output overvoltages and undervoltages using separate relays.
• World-wide power specifications supported by one Unit
(switchable).
• Output status can be monitored using LED indicator.
Refer to Safety Precautions for the K8AB
Series. Refer to page 8 for the Q&A section.
CSM_K8AB-PM_DS_E_3_1
Model Number Structure
■ Model Number Legend
K8AB-@@
1 23
1. Basic Model
K8AB: Measuring and Monitoring Relays
2. Functions
PM: Three-phase Phase-sequence Phase-loss Relay (Simultaneous upper and lower monitoring)
3. Rated Input Voltage
1: 115, 127, 133, 138, 200, 220, 230, 240 VAC
2: 220, 230, 240, 277, 380, 400, 415, 480 VAC
Ordering Information
■ List of Models
Three-phase Phase-sequence Phase-loss Relay
Rated input (See note 2.)
3-phase 3-wire mode
200, 220, 230, 240 VAC
3-phase 4-wire mode
115, 127, 133, 138 VAC
3-phase 3-wire mode
380, 400, 415, 480 VAC
3-phase 4-wire mode
220, 230, 240, 277 VAC
wwwN.Doateta: S1h. eTeht4reUe.-cpohmase 3-wire or 4-wire and the input range are switched using a DIP switch.
2. The power supply is shared with the rated input voltage.
Model
K8AB-PM1
K8AB-PM2
1
Questions and Answers
Q Checking Operation
Overvoltages
Gradually increase the input from 80% of the setting.
The input value will equal the operating value when the
input exceeds the setting and the alarm indicator starts
flashing. Operation can be checked by the relay output that
will start after the operating time has passed.
Undervoltage
Gradually decrease the input from 120% of the setting and
check the operation using the same method as for
overvoltage.
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-PM@ output relays are normally operative.
Operating set value
Input voltage
Alarm indicator
Relay output
Flashing
5s
Lit
Connection Diagram 1
3φ,
200 VAC
L1
L2
L3
V1
V2 V3
0 to 150 V
Three-phase variable
autotransformer
Overvoltage
L1
L2
L3
Undervoltage
K8AB-PM
Q How to Measure the Operating Time
Overvoltage
Change the input suddenly from 0% to 120% of the set
value and measure the time until the Unit operates.
Undervoltage
Change the input suddenly from 120% to 0% of the set
value and measure the time until the Unit operates.
Operating Time
Adjust the slide resistor so that the voltage applied to the
K8AB terminals is 120% of the set value (for overvoltage
detection) and 80% of the set value (for undervoltage
detection) 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
L2
X/a
L3
V1
R1 X/b V2 V3
R2
R1: Slide resistor
200 Ω 200 W
R2: 100 Ω 400 W
L1
L2
L3
± C 200 V
Cycle counter
Q Checking the Phase Sequence and Phase Loss
Operation
Phase Sequence
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
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.
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页数 | 10 页 | ||
下载 | [ K8AB-PM.PDF 数据手册 ] |
零件编号 | 描述 | 制造商 |
K8AB-PH | Phase-sequence Phase-loss Relay | Omron |
K8AB-PM | Three-phase Phase-sequence Phase-loss Relay | Omron |
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