Three-phase Phase-sequence Phase-loss Relay
123
K8AB-@@
Phase to phase voltage (3 wires)
Phase to neutral voltage (4 wires)
L1 L2 L3 L1 L2 L3 N
400VAC
400VAC
400VAC
230VAC
230VAC
230VAC
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.
Model Number Structure
■ Model Number Legend
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
Single K8AB Monitors 3-phase Power Supply with 3 or 4 Wires
Monitoring Relays can be used to monitor 3-phase power supplies with 3 or 4 wires simply by changing DIP switch settings.
A Single K8AB Can Monitor a 3-phase Power Supply Anywhere in the World
Reduces Maintenance Parts Inventory
K8AB-P@1
K8AB-P@2
SW3 ON ON OFF OFF
SW4 ON OFF ON OFF
SW2
SW2
ON P-N 138 V 133 V 127 V 115 V
OFF P-P 240 V 230 V 220 V 200 V
ON P-N 277 V 240 V 230 V 220 V
OFF P-P 480 V 415 V 400 V 380 V
Cat. No. N146-E1-02 Three-phase Phase-sequence Phase-loss Relay K8AB-PM 1
Ordering Information
■ List of Models
Three-phase Phase-sequence Phase-loss Relay Rated input (See note 2.) Model
3-phase 3-wire mode 200, 220, 230, 240 VAC K8AB-PM1
3-phase 4-wire mode 115, 127, 133, 138 VAC
3-phase 3-wire mode 380, 400, 415, 480 VAC K8AB-PM2
3-phase 4-wire mode 220, 230, 240, 277 VAC
Note: 1. Three-phase 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.
Ratings and Specifications
■ Ratings
Rated input
voltage
Input load K8AB-PM1: 25 VA max.
Operating value setting range (OVER, UNDER) Overvoltage
Operating value 100% operation at set value
Reset value 5% of operating value (fixed)
Reset method Automatic reset
Operating time
setting range (T)
Startup lock time (LOCK) 1 s or 5 s (Switched using DIP switch.)
Indicators P ower (PWR): Green, Relay output (RY): Yellow, OVER/UNDER: Red
Output relays Two SPDT relays (NC operation)
Output relay ratings Rated load
Ambient operating temperature −20 to 60°C (with no condensation or icing)
Storage temperature −40 to 70°C (with no condensation or icing)
Ambient operating humidity 25% to 85% (with no condensation)
Storage humidity 25% to 85% (with no condensation)
Altitude 2,000 m max.
Terminal screw tightening torque 0.49 N·m
Terminal wiring method Recommended wire
Case color Munsell 5Y8/1
Case material ABS resin (self-extinguishing resin) UL94-V0
Weight Approx. 130 g
Mounting Mounted to DIN Track or via M4 screws (tight ening torque: 1.2 N·m)
Dimensions 22.5 (W) × 90 (H) × 100 (D) mm
K8AB-PM1 Three-phase, three-wire Mode: 200, 220, 230 and 240 VAC
K8AB-PM2 Three-phase, three-wire Mode: 380, 400, 415 and 480 VAC
Overvoltage/undervoltage 0.1 to 30 s
Reversed phase/phase loss 0.1 s max.
Three-phase, four-wire Mode: 115, 127, 133 and 138 VAC
Three-phase, four-wire Mode: 220, 230, 240 and 277 VAC
K8AB-PM2: 45 VA max.
−30% to 25% of rated input volta ge
Undervoltage
−30% to 25% of rated input volta ge
Note: The rated input voltage can be switched using the DIP switch.
Resistive load
6 A at 250 VAC (cosφ = 1)
6 A at 30 VDC (L/R = 0 ms)
Inductive load
1 A at 250 VAC (cosφ = 0.4)
1 A at 30 VDC (L/R = 7 ms)
Maximum contact voltage: 250 VAC
Maximum contact current: 6 A AC
Maximum switching capacity: 1,500 VA
Minimum load: 10 mA at 5 VDC
Mechanical life: 10,000,000 operations
Electrical life: Make: 50,000 times, Break: 30,000 times
Solid wire: 2.5 mm
Twisted wires: AWG16, AWG18
Note: 1. Ferrules with insulating sleeves must be used with twisted wires.
2. Two wires can be twisted together.
Recommended ferrules
Al 1,5-8BK (for AWG16) manufactured by Phoenix Contact
Al 1-8RD (for AWG18) manufactured by Phoenix Contact
Al 0,75-8GY (for A WG18) manufactured by Phoenix Contact
2
2 Three-phase Phase-sequence Phase-loss Relay K8AB-PM Cat. No. N146-E1-02
■ Specifications
Input frequency range 45 to 65 Hz
Overload capacity Continuous input: 115% of maxim um input, 10 s max.: 125% of maximum input
Setting error Operating value Set value ±10% of full scale
Operating time
Startup lock time Set value ±0.5 s
Repeat error Operating value Operating value ±2%
Reset value Overvoltage: Operating value x 95% ±2%
Operating time Operating time repeat error: ±50 ms
Startup lock time Startup lock time repeat error: ±0.5 s
Temperature influence Operating value
Humidity influence Operating value
Influence of input frequency At 45 to 65 Hz
Applicable
standards
Insulation resistance 20 MΩ min.
Dielectric strength 2,000 VAC for one minute
Noise immunity 1,500 V power supply terminal common/normal mode
Vibration resistance
Shock resistance 100 m/s
Degree of protection Terminal section: Finger protection
Conforming standards EN60255-5 and EN60255-6
EMC EN61326
Safety standards UL508
Error calculation: Error = ((Maximum operating value − Minimum operating value (over 10 operations))/2)/
Average value × 100%
Undervoltage: Operating valu e x 105% ±2%
Error calculation: Error = ((Maximum reset value − Minimum rese t value (over 10 resets))/2)/Average value
× 100%
Overvoltage: Measured when input suddenly changes from 70% to 120% of setting.
Undervoltage: Measured when input suddenly changes from 120% to 70% of setting.
The input voltage, however, must be between 70% and 125% of rating.
(The operating time when the operating time is set to the minimum value and the power supply suddenly
changes from 0% to 100%.)
Drift based on measured value at standard temperature:
−20°C to standard temperature: ±1,000 ppm/°C max.
Standard temperature to 60°C: ±1,000 ppm/°C max.
(Humidity: 25% to 80%)
Operating time
Fluctuation based on measured value at standard temperature:
−20°C to standard temperature: ±10% max.
Standard temperature to 60°C: ±10% max.
(Humidity: 25% to 80%)
Based on ambient humidity of 65%
25% to 80%: ±5% max.
Operating time
Based on ambient room humidity
25% to 80%: ±10% max.
Operating value ±5% max.
Operating time ±10% max.
Note: The error in the operating value and oper ating time under standard conditions.
Installation environment (Pollution Degree 2, Overvoltage Category III)
Between external terminals and case
Between input terminals and output 1 terminals
Between input terminals and output 2 terminals
Between output 1 terminals and output 2 terminals
Between external terminals and case
Between input terminals and output 1 terminals
Between input terminals and output 2 terminals
Between output 1 terminals and output 2 terminals
Square-wave noise of ±1 µs/100 ns pulse width with 1-ns rise time
Frequency 10 to 55 Hz, 0.35-mm single amplitude, acceleration 50 m/s
10 sweeps of 5 min each in X, Y, and Z directions
2
, 3 times each in 6 directions along three axes (up/down, left/right, forward/backward)
2
Cat. No. N146-E1-02 Three-phase Phase-sequence Phase-loss Relay K8AB-PM 3
Connections
Flashing
Lit
Flashing
Lit
Overvoltage alarm indicator
Undervoltage setting value
Overvoltage
setting value
Undervoltage alarm indicator
Overvoltage relay
Undervoltage relay
Input
Hysteresis: Fixed at 5%
Hysteresis: Fixed at 5%
T: Operating time (0.1 to 30 s)
T: Operating time (0.1 to 30 s)
T1: Power ON lock (1 s or 5 s)
Phase loss operation
Phase sequence operation
Flashing Flashing
Input
Undervoltage alarm indicator
Undervoltage relay
L1
L3
L2
L3
L2
L1
L1
L2
L3
L1
L2
L3
T1
L1
L2
L3
T
T
Note: 1. The K8AB-PM 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. Phase loss on the power supply or load side cannot be detected in the motor load
during operation.
■ Wiring Diagram
Overvoltage/Undervoltage and Phase Sequence/Phase Loss Operation Diagram
L1N L2 L3
Voltage input
Signal output
Signal output
Load
L1
L2
L3
14
12
Overvoltage
24
22
Undervoltage
Phase loss,
reversed phase
N
11
21
Operation Indicators
Item Display Contact operation
Ry_LED Over_LED Under_LED Over_Ry Under_Ry
Overvoltage
Undervoltage
Phase
loss
Reversed
phase
Correct
phase
Note: 1. While phase loss is detected, Over_Ry will also be OFF.
ON ON OFF OFF ON
ON OFF ON ON OFF
OFF OFF (See
note 1.)
ON OFF
(See note
OFF
1.)
ON OFF Flashing
ON OFF
(See note
2.)
ON OFF OFF ON ON
2. The indicator flashes at 1-second intervals when reversed
phases are detected and at 0.5-second intervals during the
detection time.
4 Three-phase Phase-sequence Phase-loss Relay K8AB-PM Cat. No. N146-E1-02
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