Phase-sequence Phase-loss Relay
K8AK-PH
Three-phase Phase-sequence Phase-loss
Relay Using Voltage Detection Method
• Greater resistance to inverter noise.
• Distinguishes between correct phases, phase sequence, and phase
loss when power is turned ON.
• Supports phase loss detection when the motor is operating.
• 5 A (resistive load) at 250 VAC, DPDT x 1.
• Output status can be monitored using LED indicator.
•
Ideal to prevent reverse operation of motors.
Refer to
Safety Precautions
on page 8.
Refer to page 7 for commonly asked questions.
For the most recent information on models that have been
certified for safety standards, refer to your OMRON website.
Ordering Information
List of Models
Function
Phase sequence and phase loss
monitoring
Rated input voltage*
Relay output
Model
K8AK-PH1
3-phase, 3-wire 200 to 480 VAC DPDT
×1
* The power supply voltage is the same as the rated input voltage.
1
K8AK-PH
Ratings and Specifications
Ratings
Rated input voltage
Input load
Operating time
Reset method
Indicators
Output relays
Phase sequence
Phase loss
3-phase, 200 to 480 VAC (3-wire)
Approx. 4.1 VA
0.1 s±0.05 s
0.1 s max. (when the voltage changes rapidly from 100% to 0% of rated voltage)
Automatic reset
Power (PWR): Green, Relay output (RY): Yellow
One DPDT relay (NC operation)
Rated load
Resistive load
5 A at 250 VAC
5 A at 30 VDC
Minimum load: 24 VDC, 4 mA (reference values)
Mechanical life: 10 million operations min.
Electrical life: 5 A at 250 VAC or 30 VDC: 50,000 operations
3 A at 250 VAC/30 VDC:100,000 operations
−20
to 60°C (with no condensation or icing)
−25
to 65°C (with no condensation or icing)
25% to 85% (with no condensation)
25% to 85% (with no condensation)
2,000 m max.
0.49 to 0.59 N·m
Recommended wire
Solid wire: 2.5 mm
2
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 AWG18) manufactured by Phoenix Contact
N1.5
PC and ABS, UL 94 V-0
Approx. 130 g
Mounts to DIN Track.
22.5
×
90
×
100 mm
(W×H×D)
Output relay ratings
Ambient operating temperature
Storage temperature
Ambient operating humidity
Storage humidity
Altitude
Terminal screw tightening torque
Terminal wiring method
Case color
Case material
Weight
Mounting
Dimensions
2
K8AK-PH
Specifications
Input voltage range
Input frequency
Overload capacity
Phase loss detection level
200 to 480 VAC
50/60 Hz (no presumed range)
Continuous 528 V
80%±10% of rated input
Calculation Formula
= 1
−
((Highest phase-to-phase voltage
−
Lowest phase-to-phase voltage)/Average three-
phase phase-to-phase voltage)
EN 60947-5-1
Installation environment (pollution level 2, installation category III)
EN 60947-5-1
UL 508 (Recognition), Korean Radio Waves Act (Act 10564),
CSA: C22.2 No.14, CCC: GB14048.5
20 MΩ min.
Between external terminals and case
Between input terminals and output terminals
2,000 VAC for one minute
Between external terminals and case
Between input terminals and output terminals
1,500 V power supply terminal common/normal mode
Square-wave noise of ±1
µs/100
ns pulse width with 1-ns rise time
Frequency: 10 to 55 Hz, acceleration 50 m/s
2
10 sweeps of 5 min each in X,Y, and Z directions
100 m/s
2
, 3 times each in 6 directions along 3 axes
Terminals: IP20
Conforming standards
Applicable
standards
EMC
Safety standards
Insulation resistance
Dielectric strength
Noise immunity
Vibration resistance
Shock resistance
Degree of protection
●Relationship
of Mounting Distance between K8AK-PH Relays
and Ambient Temperature (Reference Values)
The following diagram shows the relationship between the mounting distances and the
ambient temperature.
If the relay is used with an ambient temperature that exceeds these values, the temperature
of the K8AK may rise and shorten the life of the internal components.
60
50
40
30
20
10
Ambient temperature [°C]
0
5
10
15
Distance between products d [mm]
Test method
Sample: K8AK-PH
Mounting distances: 0, 5, and 10 mm min.
K8AK
No.1
K8AK
No.2
K8AK
No.3
K8AK
No.4
K8AK
No.5
DIN Track
Distance between products: d
3
K8AK-PH
Connections
Terminal Diagram
Control Output
Relay output
250 VAC, 5 A (resistive load)
30 VDC, 5 A (resistive load)
L1
L2
L3
Input voltage
Relay Output
21
24
22
3-phase,
3-wire
power
supply
L1
L2
L3
Phase-to-phase voltage:
200 to 480 VAC
21
11
12
14
11
24
22
12
14
Note: 1.
Use the recommended ferrules if you use twisted wires.
Wiring Example
L1
3-phase
voltage
L2
L3
Motor
L1
L2
L3
Power supply
AC/DC
Alarm
load
21
11
24
12
22
14
Timing Charts
●Phase
Sequence and Phase Loss Operation
Diagram
Phase Loss Operation
L1
L1
Input
L2
L3
L3
L2
L1
L3
L3
L2
L2
Phase Sequence Operation
L2
L1
L3
L1
Relay
11-14
21-24
Note: 1.
The K8AK-PH1 output contacts are normally operative.
2.
The Relay will not operate if the input voltage drops below
70% of the minimum input value because L1 and L2 are
also used to provide power.
3.
Phase loss cannot be detected on the load side because
this detection is based on the voltage.
4
K8AK-PH
Nomenclature
Front
●Indicators
Terminal block
(See notes 1 and 2.)
Item
Power indicator
(PWR: Green)
Relay status indi-
cator
(RY: Yellow)
Meaning
Lit when power is being supplied
*3.
Lit when relay is operating (normally lit).
Power indicator
Relay status indicator
* The input across L1 and L2 is used for the internal power supply.
Therefore, the power indicator will not be lit if there is no input
across L1 and L2.
Note: 1.
Use either a solid wire of 2.5 mm
2
maximum or a ferrule with
insulating sleeve for the terminal connection.
The length of the exposed current-carrying part inserted into
the terminal must be 8 mm or less to maintain dielectric
strength after connection.
For 2.5 mm
2
or
smaller solid wires
For ferrules with
an insulation sleeve.
8 mm max.
8 mm max.
Recommended ferrules
Phoenix Contact
•
Al 1,5-8BK (for AWG16)
•
Al 1-8RD (for AWG18)
•
Al 0,75-8GY (for AWG18)
2.
Tightening torque: 0.49 to 0.59 N·m
Operation Methods
Connections
●Input
Connect using L1, L2, and L3.
Make sure the phase sequence is wired correctly. The Unit will not
operate normally if the phase sequence is incorrect.
L1 L2 L3
Voltage input
●Outputs
Terminals 11, 12, and 14 are the output terminals (SPDT) for
overvoltage.
Terminals 21, 22, and 24 are the output terminals (SPDT) for
undervoltage, phase loss, and phase sequence outputs.
* Use the recommended ferrules if you use twisted wires.
14
12
L1
L2
L3
11
Relay signal
output
Signal output
24
22
21
Load
5
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