New Product
Three-phase Asymmetry and Phase-sequence Phase-loss Relay
K8DS-PA
Ideal for 3-phase Voltage Asymmetry
Monitoring for Industrial Facilities and
Equipment.
• Greater resistance to inverter noise.
• Monitor voltage asymmetry, phase sequence, and phase loss in three-
phase three-wire circuits with one unit.
• One SPDT output relay, 5 A at 250 VAC (resistive load).
• World-wide power specifications supported by one unit. (Set with a
rotary switch.)
•
Relay status can be monitored using LED indicator.
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
Rated input voltage*
3-phase 3-wire mode
200, 220, 230, or 240 VAC
Model
K8DS-PA1
380, 400, 415, or 480 VAC
K8DS-PA2
Note:
The input range is set with a rotary switch.
* The power supply voltage is the same as the rated input voltage.
1
K8DS-PA
Ratings and Specifications
Ratings
Rated input
voltage
Input load
Operating value setting range (ASY.)
Operating value
Reset value
Reset method
Operating time Asymmetry
setting range Phase sequence
(T)
Phase loss
Power ON lock time (LOCK)
Indicators
Output relays
K8DS-PA1
K8DS-PA2
Three-phase, three-wire Mode: 200, 220, 230, or 240 VAC
Three-phase, three-wire Mode: 380, 400, 415, or 480 VAC
K8DS-PA1: Approx. 1.7 VA
K8DS-PA2: Approx. 2.8 VA
Asymmetry set value (%) = 2 to 22%
Asymmetry operating value = Rated input voltage
×
Asymmetry set value (%)
The asymmetry operation will function when the potential difference between the highest and low-
est voltage phases equals or exceeds the asymmetry operating value.
5% of operating value (fixed)
Automatic reset
0.1 to 30 s
0.1 s±0.05 s
0.1 s max.
1 s±0.5 s
Power (PWR): Green, Relay output (RY): Yellow, Alarm outputs (ALM): Red
One SPDT relay output
Rated load
Resistive load
5 A at 250 VAC
5 A at 30 VDC
Maximum switching capacity: 1,250 VA, 150 W
Minimum load: 5 VDC, 10 mA (reference values)
Mechanical life: 10 million operations min.
Electrical life: 5 A at 250 VAC: 50,000 operations
3 A at 250 VAC: 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
Terminal wiring method
Note: 1.
Ferrules with insulating sleeves must be used with twisted wires.
2.
Two wires can be twisted together.
Output relay ratings
Ambient operating temperature
Storage temperature
Ambient operating humidity
Storage humidity
Altitude
Terminal screw tightening torque
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
Case color
Case material
Weight
Mounting
Dimensions
N1.5
PC and ABS, UL 94 V-0
Approx. 65 g
Mounts to DIN Track.
17.5
×
80
×
74 mm (W×D×H)
2
K8DS-PA
Specifications
Input frequency
Overload capacity
Repeat accura- Operating value
cy
Operating time
Conforming standards
Applicable
standards
EMC
Safety standards
Insulation resistance
50/60 Hz
Continuous 500 V
±0.5%
full scale (at 25°C and 65% humidity, rated power supply voltage, 50/60 Hz sine wave
input)
±50
ms (at 25°C and 65% humidity, rated power supply 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
Dielectric strength
Noise immunity
Vibration resistance
Shock resistance
Degree of protection
●Relationship
of Mounting Distance between K8DS-PA 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 K8DS may rise and shorten the life of the internal components.
70
60
Ambient temperature [°C]
50
40
30
20
10
0
5
10
15
20
25
30
35
40
45
50
Distance between products d [mm]
Test method
Sample: K8DS-PA
Distance between products: 0, 5, 10, and 50 mm
K8DS
No.1
K8DS
No.2
K8DS
No.3
K8DS
No.4
K8DS
No.5
DIN Track
Distance between products: d
3
K8DS-PA
Connections
Terminal Diagram
Control Output
Relay output
250 VAC, 5 A (resistive load)
30 VDC, 5 A (resistive load)
L1
L2
L3
Input Voltages
L1
3-phase,
3-wire
power
supply
L2
L3
Relay Output
14
12
11
Phase-to-phase voltage:
200 to 480 VAC
14
12
11
Note:
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
14
12
11
Timing Charts
●Voltage
Asymmetry and Phase Sequence/Phase Loss Operation Diagram
L1
Input L2
L3
Flashing
Lit
Asymmetry operating value
Alarm indicator
Contacts
t1
t
t1: Power ON lock (1 s)
Phase Loss Operation
t: Operating time (0.1 to 30 s)
Phase sequence Operation
L2
L1
L3
L1
L1
L3
L3
L2
L2
L1
Flashing
L2
L3
L1
Input
L2
L3
Lit
Alarm indicator
Relay 11-14
Flashing Flashing
Operation Table
Item
Asymmetry
Phase loss
Incorrect
phase
Phase
sequence Correct
phase
*1
*2
Note:
1.
The K8DS-PA output contacts are normally operative.
2.
The power ON lock prevents unnecessary alarms from being generated during the unstable
period when the power is first turned ON. There is no contact output during timer operation.
3.
Phase loss is detected by a drop in the L1, L2, or L3 voltage. A phase loss is detected when
any of the phase-to-phase voltages goes below 60% of the rated input.
4.
L2 and L3 are also used for the power supply. If the voltage becomes very low, the Relay
will not operate.
5.
Phase loss is not detected in the motor load during operation.
6.
Phase loss cannot be detected on the load side because detection is based on the voltage.
Indicators
RY_LED
OFF
OFF
OFF
ON
ALM_LED
ON
ON
*1
Contact
operation
OFF
OFF
OFF
ON
Flashing
*2
OFF
Calculation Formula for Asymmetry Operating Value
Asymmetry operating condition = (Highest voltage
−
Lowest voltage) > Asymmetry
operating value
Asymmetry operating value = Rated input voltage (V)
×
Asymmetry set value (%)
Note:
The rated input voltage is set with a rotary switch.
L2 and L3 are also used for the power supply. If the voltage becomes
very low, the indicator will turn OFF.
The indicator will flash once per second after an incorrect phase is
detected and once per 0.5 second during the detection time.
4
K8DS-PA
Nomenclature
Front
●Indicators
Terminal block
(See notes 1 and 2.)
Item
Meaning
Lit when power is being supplied.*
Lit when relay is operating (normally lit).
Lit for asymmetry voltage error.
When the input exceeds the set value, the indi-
cator flashes for the operating time to indicate
the error status.
L1 L2 L3
Power indicator
(PWR: Green)
Relay status indi-
cator
(RY: Yellow)
Input voltage range
rotary switch
Asymmetry rate
knob (ASY.)
Power indicator
Relay status indicator
Alarm indicator
Alarm indicator
(ALM: Red)
* This indicator uses the input across L2 and L3 as the internal power
supply. It will not light unless there is an input across L2 and L3.
Operating time knob (T)
●Setting
Knobs
Item
Description
Used to change the input voltage range.
K8DS-PA1: 200, 220, 230, or 240 V
K8DS-PA2: 380, 400, 415, or 480 V
Used to set from 2% to 22%.
Used to set the operating time to 0.1 to 30 s.
Terminal block
(See notes 1 and 2.)
14 12 11
Input voltage range
rotary switch
Asymmetry rate knob
(ASY.)
Operating time knob
(T)
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
Wire the input to the L1, L2, and L3 terminals (3-phase, 3-wire).
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
L1
L2
L3
●Outputs
Terminals 11, 12, and 14 are the output terminals.
* Use the recommended ferrules if you use twisted wires.
14
Signal output
12
11
Relay signal
output
Load
5
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